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Hovahydrus sp. near H. minutissimus (Régimbart, 1903) Source of material. The four instar III larvae studied were associated with adults collected at the following locality: Madagascar: Antsiranana: Sava Marojejy National Park:mid-high altitude rainforest: watersource stream to camp III, 100 m from camp, MAD18-34. 14.4373S, 49.7428E, 1330 m, 11.II.2018. Leg J. Bergsten & T. Ranarilalatiana. Diagnosis (instar III). The instar III larvae of Hovahydrus sp. can easily be distinguished from those of H. praetextus by the following combination of characters: smaller size, HL = 0.71–0.76 mm; head capsule sagittate, frontoclypeus broad, subquadrate apically (Fig. 2); parietale with a reduced number of temporal spines in dorsal view (Fig. 2); metathoracic leg elongate,> 3.00 times HW; femora, tibiae and tarsi with a lesser number of secondary setae (Figs 9–10; Table 2); abdominal segment VIII distinctly constricted at point of insertion of urogomphi (Fig. 11)., Published as part of Alarie, Yves, Michat, Mariano C., Ranarilalatiana, Tolotra & Bergsten, Johannes, 2022, Larval morphology of the Madagascan endemic diving beetle genus Hovahydrus Biström, 1982 (Coleoptera: Dytiscidae) and phylogenetic comparison with other known Hyphydrini, pp. 227-246 in Zootaxa 5219 (3) on page 231, DOI: 10.11646/zootaxa.5219.3.2, {"references":["Regimbart, M. (1903) Coleopteres aquatiques (Haliplidae, Dytiscidae, Gyrinidae et Hydrophilidae) recueillis dans le sud de Madagascar par M. Ch. Alluaud (juillet 1900 - mai 1901). Annales de la Societe Entomologique de France, 72, 1 - 51."]}

Hovahydrus praetextus (Guignot, 1951) (Figs 13–16) Source of material. The only instar III larva studied was associated with adults collected at the following locality: Madagascar: Antsiranana: Sava Marojejy National Park:alpine, above treeline:small clearwater stream with knee-deep pools, below summit: MAD18-31. 14.4506S, 49.7318E, 2060 m, 10.II.2018. Leg J. Bergsten & T. Ranarilalatiana. Diagnosis (instar III). The instar III larvae of Hovahydrus praetextus can easily be distinguished from those of Hovahydrus sp. by the following combination of characters: larger size, HL = 1.13 mm; head capsule pear-shaped, frontoclypeus narrower, rounded apically (Fig. 13); parietale with a large number of temporal spines in dorsal view (Fig. 13); metathoracic leg shorter, Published as part of Alarie, Yves, Michat, Mariano C., Ranarilalatiana, Tolotra & Bergsten, Johannes, 2022, Larval morphology of the Madagascan endemic diving beetle genus Hovahydrus Biström, 1982 (Coleoptera: Dytiscidae) and phylogenetic comparison with other known Hyphydrini, pp. 227-246 in Zootaxa 5219 (3) on page 232, DOI: 10.11646/zootaxa.5219.3.2, {"references":["Guignot, F. (1951) Nouvelles especes de dytiscides et gyrinides de Madagascar (Coleopteres). Le Naturaliste Malgache, 3, 47 - 50."]}

Dendrothripoides moundi sp.n. Female macroptera. Slide-mounted macerated females bicolored (Fig. 1); head, pronotum, metanotum, first abdominal segment and legs pale yellow; abdominal segments II–X golden brown; antennal segments I–V yellow, VI mainly yellow but with apex brown (Fig. 5), VII–VIII brown; fore wing with three white and two black areas as following: white at base also with white band distal to veinal fork and at apex, small dark marking near base and median area (Fig. 6). Antennae 8-segmented, segments III and IV with forked sense cones, IV and V weakly pedicelate, III–VI rounded at each side (Fig. 5). Ocellar setae III arising on lateral side of ocellar triangle, shorter than distance between hind ocelli (Fig. 2). Pronotum (Fig. 3) without distinct sculpture lines, with about 40 discal setae well-developed, posteroangular setae spatulate (Fig. 3) with four pairs of posteromarginal setae. Mouth-cone long and stout, extending just beyond posterior margin of prosternum (Fig. 3). Mesonotum with polygonal sculpture (Fig. 4), without campaniform sensilla. Metanotum medially with polygonal sculpture, median pair of setae behind anterior margin; campaniform sensilla present (Fig. 4). Fore wing first vein with 1 + 4 and 2 setae on distal third; clavus with 4 marginal setae and no discal setae. Abdomen relatively short and broad; segment X tubular, heavy, longitudinally grooved. Tergite I dorsally with 3–4 anastomosing transverse lines of sculpture; tergites II–VIII with conspicuous stout microtrichia about 8–10 microns long on triangular warts in about five rows, covering more than two-thirds of the dorsal aspect (Fig. 9); II–VII with S1 setae shorter than S2 setae, 5 and 16 microns long respectively, posteromarginal setae (S3) stouter and curved, about 30 microns long, and on II–V setae S4 only about 20 microns long; tergite VIII with S1 setae almost as long as S2 setae; tergites IX and X with setae S1, S2 and S3 spine-like, long and dark (Fig. 11). Sternites II–VII each with about 3 pairs of setae on posterior margin. Measurements (holotype female, in microns). Body length 1233. Head, length 96; width across eyes 130; ocellar setae I 7, III 8; four pairs of postocular setae 12–13. Pronotum, length 114; width 195; posteroangular setae 34. Posteromedial setae 18; four pairs of posteromarginal setae 8–12. Fore wing length 471. Antennal segments I–VII length 16, 24, 38, 44, 30, 40, 10, 18. Tergite VIII S1 length 48, S2 55; tergite IX S1 length 111, S2 length 125, S3 length 101. Tergite X S1 length 92, S2 length 87, S3 length 101. Male macroptera. Similar in structure to female but smaller and slender. Abdominal segments IX and X strongly sclerotized; tergite IX with median pair of short conical setae close to each other, and 3 pairs of small tubercles arranged laterally below median pair of setae; sternites III–VII each with a small transverse pore plate on middle of anterior margin (Fig. 10). Measurements (paratype male in microns). Body length 813. Fore wing 450. Pore plate dimensions on sternites III, IV and V: 23/6; 20/5; 23/4. Type material. Holotype female, Kaominina, Moramanga, MADAGASCAR (lat: -18.94; lon: 48.41; elevation: 909.0 m.a.s.l.), on flowers of Lantana camara, 15.iv.2018 (Enric Frago) in the collection of insects of the Centre de Biologie pour la Gestion des Populations (CBGP) Montpellier, France. Paratypes: 7 females and 1 male with the same data as holotype in CBGP Montpellier, 1 female in Muséum national d’ histoire Naturelle, Paris. Comments. This species is very similar to D. nakaharai but it differs from it in the colour of the fore wing, the sculpture of the metanotum, the position of the metanotal campaniform sensilla, and the size and shape of the male sternal pore plates.

Key to species of Dendrothripoides 1. Body bicolored, head and thorax yellow in contrast to golden brown abdomen..................................... 2 -. Body not bicolored, largely yellowish..................................................................... 3 2. Fore wing uniformly dark brown to apex, but base with anterior margin narrowly pale extending to short pale cross area at veinal fork; metanotal median area with irregular polygons, one campaniform sensillum placed slightly in advance of the other; male sternal pore plates circular, less than 15 microns in diameter (Philippines)....................... nakaharai Reyes -. Fore wing brown with apex and base pale, but with wide white cross-band distal to veinal fork (Fig. 6); metanotal median area with regular polygons, campaniform sensilla placed side-by-side; sternal pore plates of male transverse, about 20 microns wide and 5 microns long (Madagascar)............................................................... moundi sp.n. 3. Abdominal tergites with fine microtrichia arising from equiangular reticulations; tergite VIII with setae S1 and S2 almost equal in length (Philippines)................................................................ microchaetus Okajima -. Abdominal tergites with spine-like microtrichia arising from V-shaped lines of sculpture; tergite VIII with S1 setae slightly shorter than S2 setae................................................................................... 4 4. Pronotal discal setae very small and slightly lanceolate; mouth-cone conical, extending between fore coxae; abdominal tergites VI���VII with S1 setae much larger than S2 setae (Pantropical)...................................... innoxius (Karny) -. Pronotal discal setae large and distinctly lanceolate; mouth-cone long and slender, extending beyond fore coxae; abdominal tergites VI���VII with S1 setae much smaller than S2 setae...................................................... 5 5. Fore wing mainly dark brown, with small white area near base distally; males with large oval pore plates (Southern Africa).......................................................................................... venustus Faure -. Fore wing with two dark areas separated by two white areas; males with pore plates small and circular (Thailand)...................................................................................................... poni Kudo, Published as part of Goldarazena, Arturo, Matsumoto, Masami, Ranarilalatiana, Tolotra, Dianzinga, Niry T., Frago, Enric & Michel, Bruno, 2020, Dendrothripoides moundi (Thysanoptera, Thripidae), a new species from Madagascar, pp. 396-400 in Zootaxa 4877 (2) on page 397, DOI: 10.11646/zootaxa.4877.2.12, http://zenodo.org/record/4424080

Bidessus cf. nero Gschwendtner, 1933 Figs 1D, 3D Bidessus nero Gschwendtner, 1933: 86. Bidessus nero – Bistr̂m 1985: 18. — Nilsson 2001: 115. — Nilsson & Hajek 2020: 104. Bidessus unicolor (Guignot, 1946) – Guignot 1959: 255. Diagnostic characters Head frontally not margined; provided with a slight depression slightly posterior to anterior edge of head (between eyes); frontal depression is medially broadly vague and indistinct. Pronotum on disc with a broad impunctate area. Pronotal striae at base not deeply impressed, distinctly angled and not smoothly curved. Basal striae of elytra medium long and distinct. Anteriorly sutural lines of elytra disappear abruptly a short distance before reaching frontal edge; posteriorly lines fade away long before reaching apex. Elytra with punctures on each side of basal striae of equal size and density (rather fine, sparse and slightly irregular). Apical ventrite with rather fine, slightly sparse punctuation. Female with outline of elytra posteriorly smooth (minor process absent). Penis in lateral view quite slender and evenly curved; apex distinct (also slightly curved). Penis apex not distinctly extended (Fig. 3D). Length of body 1.5–1.9 mm. Material examined MADAGASCAR • 1 ♂; Fianarantsoa former province, Amoron’i Mania region, 3 km south of Ambalamanakana next to RN7, Ankazomivady forest; 20.7722° S, 47.1809° E; 1700 m a.s.l.; 1 Nov. 2014; J. Bergsten, T. Ranarilalatiana and S.Holmgren leg.; collecting event MAD14-02; hygropetric rocks and marsh with vegetation; NHRS-JLKB000025032 • 5 specs (preserved in ethanol); same collection data as for preceding; NHRS-JLKB000025024 • 1 spec.; same collection data as for preceding; FMNH • 1 spec.; same collection data as for preceding; PBZT / MBC • 1 spec. (preserved in ethanol); Fianarantsoa former province, Matsiara Ambony region, Ranomafana NP, 500 m from the road at Vohiparara village; 21.2397° S, 47.3774° E; 1110 m a.s.l.; 3 Nov. 2014; J. Bergsten, T. Ranarilalatiana and S. Holmgren leg.; collecting event MAD14-10; small forest lake with floating margins of vegetation; NHRS- JLKB000025025 • 1 spec.; Toamasina former province, Alaotra Mangoro region, 6 km W of Moramanga, Betsabora river by RN2 near Antsampanana village; 18.9247° S, 48.1828° E; 900 m a.s.l.; 24 Nov. 2014; J. Bergsten, J.H. Randriamihaja and T. Ranarilalatiana leg.; collecting event MAD14-81; river with side pools; NHRS-JLKB000025026 • 2 specs; Fianarantsoa former province, ca 9 km SW Ivato, Bemanta (inselberg); 20°40′00″ S, 47°07′41.5″ E; 1531 m a.s.l.; 18 May 2016; Ramahandrison and Manuel leg.; wide and calm portion of small river; CMM • 16 specs; Fianarantsoa former province, along road N7 between Ambositra and Fianarantsoa, ca 3.5 km S of Ambalamanakana; 20°46′33″ S, 47°10′53″ E; 1702 m a.s.l.; 19 May 2016; Ramahandrison and Manuel leg.; large pond with Nymphaeaceae and surrounding peat bog with Sphagnum and Drosera; CMM • 13 specs; Fianarantsoa former province, ca 8 km WNW of Ranomafana, ca 1 km SW of Vohiparara; 21°14′51″ S, 47°22′34.5″ E; 1134 m a.s.l.; 29 Dec. 2017; Ramahandrison and Manuel leg.; small marsh, very shallow, with small Poaceae and Cyperaceae, along slowly flowing stream; CMM. Distribution First record from Madagascar and here recorded from Ranomafana NP, near Ambalamanakana and Ivato along RN7 and near Moramanga (Fig. 4C). As tentatively defined here, the species is distributed in central and east Africa and Madagascar (see Bistr̂m 1985; Nilsson & Hajek 2020). Collecting circumstances On Madagascar found at elevations between 900–1700 m a.s.l. The localities are characterized by being vegetation-rich stagnant waters, a pool next to a river, a pond/marsh and small lake with floating vegetation edges. Semi-open to open landscapes. Taxonomic observation Further study on molecular level may reveal that B. cf. nero in Madagascar is in fact a separate species., Published as part of Bergsten, Johannes, Ranarilalatiana, Tolotra & Biström, Olof, 2020, A new species of Bidessus from Anjozorobe-Angavo and a review of Malagasy Bidessus (Coleoptera, Dytiscidae), pp. 1-18 in European Journal of Taxonomy 720 on pages 11-13, DOI: 10.5852/ejt.2020.720.1109, http://zenodo.org/record/4068355, {"references":["Gschwendtner L. 1933. Neue Schwimmkafer aus Belgisch Kongo. IV. Teil. Revue de Zoologie et botanique africaines 23: 84 - 95.","Nilsson A. N. 2001. Dytiscidae (Coleoptera). World Catalogue of Insects 3: 1 - 395.","Nilsson A. N. & Hajek J. 2020. A World Catalogue of the Family Dytiscidae, or the Diving Beetles (Coleoptera, Adephaga) Version 1. I. 2020. Electronic and updated version of Nilsson A. N. (2001). Dytiscidae. In: World Catalogue of Insects: 1 - 395. Available from www. waterbeetles. eu [accessed 5 Sep. 2020].","Guignot F. 1959. Revision des Hydrocanthares d'Afrique (Coleoptera: Dytiscoidea). Premiere Partie. Annales de Musee royal du Congo Belge, Tervuren: Sciences zoologiques 70: 1 - 313.","Regimbart M. 1895. Revision des Dytiscidae et Gyrinidae d'Afrique, Madagascar et iles voisines. Memoires de la Societe entomologique de Belgique 4: 1 - 244.","Kolbe H. J. 1883. Uber die madagascarischen Dytisciden des K ˆ nigl. entomologischen Museums zu Berlin. Archiv fur Naturgeschichte 49 (1): 383 - 427.","Guignot F. 1956. Contribution a la connaissance de la faune dystiscidienne Malgache. Le Naturaliste malgache 8: 75 - 80.","Bistrom O. & Sanfilippo N. 1986. Bidessus apicidens sp. n., and faunistic notes on the genus from Africa (Coleoptera, Dytiscidae). Annales Entomologici Fennici 52: 46 - 47.","Guignot F. 1941. Description de nouveaux Dytiscidae d'Afrique. Bulletin de la Societe d'Etude des Sciences naturelles de Vaucluse 11 (3 - 4) (1940): 31 - 39."]}

Bidessus anjozorobe sp. nov. urn:lsid:zoobank.org:act: C6F11BD1-C6DC-41B6-8994-35C58E 062999 Figs 1C, 3C Diagnostic characters Head slightly posterior to frontal edge with a shallow, transverse depression, which medially is vague. Pronotum discally with broad area with fine, sparse and irregular punctures. Pronotal striae at base strongly impressed; angled (not smoothly curved). Basal striae of elytra medium long, straight (close to base, strongly curved outwards); at base quite strongly impressed. Sutural lines close to frontal edge of elytra distinct; posteriorly lines gradually fade away. Female with outline of elytra posteriorly smooth (minor process absent). Penis in lateral view curved, medially slightly straightened. Penis apex with a long and slender extension (Fig. 3C), a feature which separates B. anjozorobe from all other Bidessus species known from Madagascar. Considering morphology B. anjozorobe most resembles B. perrinae Bistr ̂m, 1985 thus far known from Angola. The two species are separated as follows: elytra almost unicolored dark, black to dark piceous in B. anjozorobe while distinctly bicolored in B. perrinae, elytra being brownish to dark ferrugineous with distinct testaceous markings. Furthermore, body slightly larger and more robust in B. anjozorobe than in B. perrinae (length of body 1.6 mm). See original description in Bistr̂m (1985). Etymology Named after the type locality Anjozorobe forest, part of the Anjozorobe-Angavo protected area. The epithet is a noun in apposition (ICZN 11.9.1.2). Type material Holotype MADAGASCAR • 1 ♂; Antananarivo former province, Analamanga region, 10 km E of Anjozorobe, Anjozorobe-Angavo protected area, marsh next to the stream in Saha forest; 18.4128° S, 47.9439° E; 1320 m a.s.l.; 23 Nov. 2014; J. Bergsten, R. Bukontaite, S. Holmgren, J.H. Randriamihaja and T. Ranarilalatiana leg.; collecting event MAD14-78; forest marsh; NHRS-JLKB000025033. Paratypes MADAGASCAR • 1 spec.; same collecting data as for holotype; NHRS-JLKB000025034 • 27 specs (preserved in ethanol); same collecting data as for holotype; NHRS-JLKB000025027 • 5 specs; same collecting data as for holotype; FMNH • 5 specs; same collecting data as for holotype; BMNH • 5 specs; same collecting data as for holotype; PBZT / MBC • 5 specs; same collecting data as for holotype; DEUA • 1 ♂; Antananarivo former province, Analamanga region, 10 km E of Anjozorobe, Anjozorobe Angavo protected area, Antsahabe, circuit bamboo; 18.41266° S, 47.9438° E; 1341 m a.s.l.; 5 Apr. 2016; T. Ranarilalatiana leg.; collecting event MAD16-40; marsh and stream pool; NHRS-JLKB000065489 • 1 ♀; same collecting data as for preceding; NHRS-JLKB000065490. Type locality Madagascar, Antananarivo, Analamanga, Anjozorobe-Angavo Protected Area, Saha forest (18.4128° S, 47.9439° E) (Fig. 5). Description Male BODY. Length 1.7–1.8 mm. Dorsal aspect as in Fig. 1C. Angle between pronotum and elytra indistinct. HEAD. Dark brown to dark piceous. Frontally between eyes not margined. Slightly posterior to frontal edge with a shallow, transverse depression, which medially is vague. Shiny although covered with fine, slightly indistinct reticulation; meshes when distinguished are isodiametric. Posterior to cervical line reticulation indistinct; surface is shagreened. With fine, sparse and somewhat irregular punctures. Posterior to cervical line impunctate. Antenna with basal segments 1–4 pale, testaceous; segments 5–11 darker; brown to piceous. PRONOTUM. Broadest at posterior corners. Sides posteriorly straight; anteriorly clearly curved inwards. Bright testaceous; anteriorly and between striae with narrow blackish to dark brown, transverse area. At posterior corners with vague, darker spots. Discally with broad area with fine, sparse and irregular punctures. At pronotal edges punctures coarser and denser. Shiny, not reticulated. ELYTRA. Black to dark piceous; apically with a vague, paler area. Basal striae medium long and straight (close to frontal edge strongly curved outwards for a short distance). Sutural lines close to frontal edge of elytra, distinct; posteriorly lines gradually fade away. Punctures fine to rather fine, somewhat sparse and with slightly irregular distribution. On each side of elytral stria, punctures of almost equal size and density. Towards apical region punctures become slightly finer. In frontal half of elytra with a lateral row of slightly irregular punctures. Row of punctures form a shallow but clearly discernible furrow which in posterior half disappears. Narrow area between furrow and epipleuron pale brownish and with finer and sparser punctures. Shiny, not reticulated. Epipleura pale brownish. VENTRAL ASPECT. Pronotum testaceous, with lateral edges narrowly blackish. Metathorax, metacoxal plates and abdomen blackish to dark piceous. Rather shiny, reticulation absent. Punctures distributed as follows: metathorax medially with two rows of fine punctures and at frontal and lateral edge with a single row. Metacoxal plates medially with a few scattered punctures and at inner margin of metacoxal lines with a row of punctures. Abdomen at base with irregular coarse punctures and ventrite in apical half with dense, quite coarse punctures. Otherwise ventral aspect almost impunctate. LEGS. Testaceous to brownish. Protarsi slightly enlarged; mesotarsi slender. MALE GENITALIA. Fig. 3C. Female Similar to male but protarsi not enlarged, narrower than in male. Distribution Endemic to Madagascar and only known from the type locality in Anjozorobe forest, Central Highlands (Fig. 4C). Collecting circumstances The type locality is a vegetation rich marsh in a forest glade at an elevation of 1320 m a.s.l. (Fig. 5). Small water pools were visible at the edges of the marsh during the visit at the end of November 2014 but mostly derived through stamping in the vegetation. Anjozorobe-Angavo forest corridor with its westerly location is a higher elevation forest and represents a transition type between typical eastern humid forest and sub-humid high plateau forest., Published as part of Bergsten, Johannes, Ranarilalatiana, Tolotra & Biström, Olof, 2020, A new species of Bidessus from Anjozorobe-Angavo and a review of Malagasy Bidessus (Coleoptera, Dytiscidae), pp. 1-18 in European Journal of Taxonomy 720 on pages 8-9, DOI: 10.5852/ejt.2020.720.1109, http://zenodo.org/record/4068355

Bidessus longistriga Régimbart, 1895 Figs 2C, 3G Bidessus longistriga Régimbart, 1895: 79. Bidessus longistriga – Alluaud 1900: 59. — Zimmermann 1920: 54. — Guignot 1959: 254. — Bistr̂m 1985: 7. — Rocchi 1991: 85. — Nilsson 2001: 115. — Pederzani & Rocchi 2009: 93. — Nilsson & Hajek 2020: 104. Diagnostic characters Head frontally not margined but provided with a shallow, transverse depression slightly posterior to anterior edge of head (between eyes). Pronotum on disc with a broad impunctate area or with a few fine punctures, distinctly sparser than punctures at frontal and posterior edge. Pronotal striae at base deeply impressed. Pronotal striae with a distinct angle (not smoothly curved). Basal striae of elytra long. Sutural lines distinct; anteriorly and posteriorly lines fade away; transformed to row of punctures. Punctures on both side of basal striae of unequal size; distinctly coarser on inner side. Apical sternite with fine, slightly irregular punctures. Female with outline of elytra posteriorly smooth (minor extension absent). Penis in lateral view slender, curved but medially somewhat straightened. Penis apex not distinctly extended (Fig. 3G). Length of body 1.6–1.8 mm. Material examined 283 specimens (BMNH, NHRS, NMW, PBZT / MBC, DEUA) from provinces Antsiranana, Mahajanga, Toliara, Fianarantsoa and Toamasina (see Supplementary File 1). Distribution Endemic species to Madagascar but widely distributed on the island in lowland areas below 800 m a.s.l. (Fig. 4A). Collecting circumstances An apt flier that can be collected at light. At low altitudes on both east and west coast, found in a variety of stagnant waters (rice fields, ponds, pools in riverbeds), and in slow-flowing parts of rivers and canals. Often occurs sympatrically with B. perexiguus., Published as part of Bergsten, Johannes, Ranarilalatiana, Tolotra & Biström, Olof, 2020, A new species of Bidessus from Anjozorobe-Angavo and a review of Malagasy Bidessus (Coleoptera, Dytiscidae), pp. 1-18 in European Journal of Taxonomy 720 on pages 6-8, DOI: 10.5852/ejt.2020.720.1109, http://zenodo.org/record/4068355, {"references":["Regimbart M. 1895. Revision des Dytiscidae et Gyrinidae d'Afrique, Madagascar et iles voisines. Memoires de la Societe entomologique de Belgique 4: 1 - 244.","Alluaud C. 1900. Liste des insectes coleopteres de la region malgache. In: Grandidier A. (ed.) Histoire physique, naturelle et politique de Madagascar volume 21, Histoire naturelle des Coleopteres, tome I, texte, 1 er partie: 56 - 76. Imprimerie nationale, Paris. https: // doi. org / 10.5962 / bhl. title. 1599","Zimmermann A. 1920. Pars 71. Dytiscidae, Haliplidae, Hygrobiidae, Amphizoidae. In: Schenkling S. (ed.) Coleopterorum Catalogus, Volumen IV. Junk, Berlin.","Guignot F. 1959. Revision des Hydrocanthares d'Afrique (Coleoptera: Dytiscoidea). Premiere Partie. Annales de Musee royal du Congo Belge, Tervuren: Sciences zoologiques 70: 1 - 313.","Rocchi S. 1991. Contributo alla conoscenza degli Haliplidae e dei Dytiscidae del Madagascar con descrizione di due nuove specie (Coleoptera). Frustula Entomologica (Nuova Serie) 14: 71 - 89.","Nilsson A. N. 2001. Dytiscidae (Coleoptera). World Catalogue of Insects 3: 1 - 395.","Pederzani F. & Rocchi S. 2009. On some Madagascan Hydradephaga of The Natural History Museum, London, with the descriptions of five new species of Dytiscidae (Coleoptera Haliplidae, Dytiscidae, Noteridae). Atti dell'Accademia Roveretana degli Agiati, Contributi della Classe di Scienze Matematiche, Fisiche e Naturali (8) 8 B (258) (2008): 81 - 100.","Nilsson A. N. & Hajek J. 2020. A World Catalogue of the Family Dytiscidae, or the Diving Beetles (Coleoptera, Adephaga) Version 1. I. 2020. Electronic and updated version of Nilsson A. N. (2001). Dytiscidae. In: World Catalogue of Insects: 1 - 395. Available from www. waterbeetles. eu [accessed 5 Sep. 2020].","Guignot F. 1956. Contribution a la connaissance de la faune dystiscidienne Malgache. Le Naturaliste malgache 8: 75 - 80.","Kolbe H. J. 1883. Uber die madagascarischen Dytisciden des K ˆ nigl. entomologischen Museums zu Berlin. Archiv fur Naturgeschichte 49 (1): 383 - 427."]}

Bidessus cf. ceratus Guignot, 1941 Figs 1B, 3B Bidessus ceratus Guignot, 1941: 31. Bidessus ceratus – Guignot 1959: 257. — Bistr̂m 1985: 20. — Rocchi 1991: 85. — Nilsson 2001: 114. — Pederzani & Rocchi 2009: 93. — Nilsson & Hajek 2020: 104. Diagnostic characters Head frontally not margined. Slightly posterior to frontal edge with slight depression and anterior to it with three (sometimes four) transversely located, slight but clearly distinguishable tubercles. Pronotum on disc with a rather broad impunctate area. Pronotal striae distinct but not strongly impressed; striae angled and sinuate. Basal striae of elytra distinct but comparatively short. Sutural lines present but quite weakly developed; anteriorly they end clearly before reaching frontal edge of elytra; posteriorly they are transformed to a row of separate punctures slightly behind middle of elytra. Punctures on each side of elytral striae almost similar; fine, slightly irregularly distributed and somewhat sparse. Ventrite apically with distinct and quite dense punctures. Female with outline of elytra posteriorly smooth (minor process absent). Penis (lateral aspect) comparatively robust, evenly curved; (dorsal aspect), quite broad. Penis apex not distinctly extended (Fig. 3B). Length of body 1.8–2.0 mm. Material examined MADAGASCAR • 5 specs; “envir. de Perinet riv. Farimbany” [around Perinet, Farimbany river]; “(Q 800)” [800 m a.s.l.]; 18 Jul. 1970; N. Sanfilippo leg.; FMNH. Distribution A species as tentatively defined here distributed in East Africa and Madagascar (see Biström 1985). In Madagascar only known from Moramanga and Analamazaotra NP in east central parts (Fig. 4D). However, Pederzani & Rocchi (2009) identified seven specimens collected in southern Madagascar by Gerecke & Goldschmidt in 2001 as B. ceratus (specimens housed at BMNH and NMW). The series, which we have not studied, was collected north of Ranopiso (25.05° S, 46.67° E) near the southern part of Andohahela NP and ca 35 km west of Taolanaro. Collecting circumstances According to label information sampled at 800–1000 m a.s.l. Taxonomic observation Bidessus ceratus is described from Uganda in eastern continental Africa. When the B. sharpi species group was revised (Bistr̂m 1985), specimens from Madagascar were considered to belong to this species. There are, however, features, which indicate the existence of a separate species in Madagascar. No fresh specimens in ethanol are at present available for DNA analyses and accordingly the earlier interpretation is retained., Published as part of Bergsten, Johannes, Ranarilalatiana, Tolotra & Biström, Olof, 2020, A new species of Bidessus from Anjozorobe-Angavo and a review of Malagasy Bidessus (Coleoptera, Dytiscidae), pp. 1-18 in European Journal of Taxonomy 720 on pages 5-6, DOI: 10.5852/ejt.2020.720.1109, http://zenodo.org/record/4068355, {"references":["Guignot F. 1941. Description de nouveaux Dytiscidae d'Afrique. Bulletin de la Societe d'Etude des Sciences naturelles de Vaucluse 11 (3 - 4) (1940): 31 - 39.","Guignot F. 1959. Revision des Hydrocanthares d'Afrique (Coleoptera: Dytiscoidea). Premiere Partie. Annales de Musee royal du Congo Belge, Tervuren: Sciences zoologiques 70: 1 - 313.","Rocchi S. 1991. Contributo alla conoscenza degli Haliplidae e dei Dytiscidae del Madagascar con descrizione di due nuove specie (Coleoptera). Frustula Entomologica (Nuova Serie) 14: 71 - 89.","Nilsson A. N. 2001. Dytiscidae (Coleoptera). World Catalogue of Insects 3: 1 - 395.","Pederzani F. & Rocchi S. 2009. On some Madagascan Hydradephaga of The Natural History Museum, London, with the descriptions of five new species of Dytiscidae (Coleoptera Haliplidae, Dytiscidae, Noteridae). Atti dell'Accademia Roveretana degli Agiati, Contributi della Classe di Scienze Matematiche, Fisiche e Naturali (8) 8 B (258) (2008): 81 - 100.","Nilsson A. N. & Hajek J. 2020. A World Catalogue of the Family Dytiscidae, or the Diving Beetles (Coleoptera, Adephaga) Version 1. I. 2020. Electronic and updated version of Nilsson A. N. (2001). Dytiscidae. In: World Catalogue of Insects: 1 - 395. Available from www. waterbeetles. eu [accessed 5 Sep. 2020]."]}

Bidessus perexiguus Kolbe, 1883 Figs 2B, 3F Bidessus perexiguus Kolbe, 1883: 407. Bidessus perexiguus – Régimbart 1895: 82. — Alluaud 1900: 60. — Zimmermann 1920: 56. — Guignot 1959: 260. — Bistr̂m 1985: 28. — Rocchi 1991: 85. — Nilsson 2001: 115. — Pederzani & Rocchi 2009: 93. — Nilsson & Hajek 2020: 105. Diagnostic characters Head frontally not margined but provided with a shallow, transverse depression which medially is indistinct. Pronotum discally with a broad area with fine and sparse punctures; distinctly sparser than punctures at frontal and posterior edge. Pronotal striae at base deeply impressed. Pronotal striae with a distinct angle (not smoothly curved). Basal striae of elytra rather short. Sutural lines distinct; anteriorly and posteriorly lines fade away; anteriorly lines transformed to a short row of a few punctures. Punctures on both side of basal striae fine, sparse and of equal size. Apical ventrite with a few fine, slightly irregular punctures. Female with outline of elytra posteriorly smooth (minor extension absent). Penis in lateral view slender, almost evenly curved. Penis apex slightly extended (Fig. 3F). Length of body 1.4–1.5 mm. Material examined 478 specimens (NHRS, CAS, NMW, PBZT / MBC, BMNH, DEUA) from provinces Antsiranana, Mahajanga, Toliara and Fianarantsoa (see Supplementary File 1). Distribution Endemic species to Madagascar but as B. longistriga widely distributed on the island in lowland areas below 800 m a.s.l. (Fig. 4B). Collecting circumstances An apt flier that can be collected at light. At low altitude it can occur in a variety of mainly stagnant habitats such as eutrophied ponds, pools in dried out riverbeds, even water-filled wheel tracks. Often occurs sympatrically with B. longistriga, at least in western parts of Madagascar., Published as part of Bergsten, Johannes, Ranarilalatiana, Tolotra & Biström, Olof, 2020, A new species of Bidessus from Anjozorobe-Angavo and a review of Malagasy Bidessus (Coleoptera, Dytiscidae), pp. 1-18 in European Journal of Taxonomy 720 on pages 15-16, DOI: 10.5852/ejt.2020.720.1109, http://zenodo.org/record/4068355, {"references":["Kolbe H. J. 1883. Uber die madagascarischen Dytisciden des K ˆ nigl. entomologischen Museums zu Berlin. Archiv fur Naturgeschichte 49 (1): 383 - 427.","Regimbart M. 1895. Revision des Dytiscidae et Gyrinidae d'Afrique, Madagascar et iles voisines. Memoires de la Societe entomologique de Belgique 4: 1 - 244.","Alluaud C. 1900. Liste des insectes coleopteres de la region malgache. In: Grandidier A. (ed.) Histoire physique, naturelle et politique de Madagascar volume 21, Histoire naturelle des Coleopteres, tome I, texte, 1 er partie: 56 - 76. Imprimerie nationale, Paris. https: // doi. org / 10.5962 / bhl. title. 1599","Zimmermann A. 1920. Pars 71. Dytiscidae, Haliplidae, Hygrobiidae, Amphizoidae. In: Schenkling S. (ed.) Coleopterorum Catalogus, Volumen IV. Junk, Berlin.","Guignot F. 1959. Revision des Hydrocanthares d'Afrique (Coleoptera: Dytiscoidea). Premiere Partie. Annales de Musee royal du Congo Belge, Tervuren: Sciences zoologiques 70: 1 - 313.","Rocchi S. 1991. Contributo alla conoscenza degli Haliplidae e dei Dytiscidae del Madagascar con descrizione di due nuove specie (Coleoptera). Frustula Entomologica (Nuova Serie) 14: 71 - 89.","Nilsson A. N. 2001. Dytiscidae (Coleoptera). World Catalogue of Insects 3: 1 - 395.","Pederzani F. & Rocchi S. 2009. On some Madagascan Hydradephaga of The Natural History Museum, London, with the descriptions of five new species of Dytiscidae (Coleoptera Haliplidae, Dytiscidae, Noteridae). Atti dell'Accademia Roveretana degli Agiati, Contributi della Classe di Scienze Matematiche, Fisiche e Naturali (8) 8 B (258) (2008): 81 - 100.","Nilsson A. N. & Hajek J. 2020. A World Catalogue of the Family Dytiscidae, or the Diving Beetles (Coleoptera, Adephaga) Version 1. I. 2020. Electronic and updated version of Nilsson A. N. (2001). Dytiscidae. In: World Catalogue of Insects: 1 - 395. Available from www. waterbeetles. eu [accessed 5 Sep. 2020].","Guignot F. 1956. Contribution a la connaissance de la faune dystiscidienne Malgache. Le Naturaliste malgache 8: 75 - 80."]}

Key to species of Bidessus on Madagascar 1. Elytral stria long, approximately half the length of elytron (Figs 1A, 2C)...................................... 2 – Elytral stria short, distinctly shorter than half the length of elytron (Figs 1 B–D, 2A–B)................ 3 2. Elytral stria straight (Fig. 1A); female ventrite with a deep, longitudinal furrow; female elytron posteriorly with a distinct, lateral extension (Fig. 1A)...... B. apicidens Biström & Sanfilippo, 1986 – Elytral stria sinuate (Fig. 2C); female ventrite simple, no longitudinal furrow; female elytron posteriorly smooth, lacks extension.................................................. B. longistriga Régimbart, 1895 3. Small species (max. length 1.5 mm); elytra with distinct, longitudinal, pale markings (Fig. 2B)....................................................................................................................... B. perexiguus Kolbe, 1883 – Larger species (length 1.5–2.0 mm); elytra predominantly dark, sometimes with minor, vague, pale markings (Figs 1 B–D, 2A)............................................................................................................... 4 4. Frontal transverse depression of head transformed to four minor, slightly vague, tubercles (Fig. 1B)................................................................................................. B. cf. ceratus Guignot, 1941 – Frontal transverse depression of head not transformed to small tubercles (depression laterally distinct, medially vague)................................................................................................................... 5 5. Head and pronotum mainly pale, testaceous (Fig. 1D)................... B. cf. nero Gschwendtner, 1933 – Head distinctly darker than pronotum (Figs 1C, 2A)....................................................................... 6 6. Elytral stria longer (approximately ⅓ of elytron length); body shape broad (Fig. 1C); pronotum extensively pale (dark markings reduced to narrow areas close to frontal and posterior edges) (Fig. 1C); antenna pale (Fig. 1C).................................................................... B. anjozorobe sp. nov. – Elytral stria short (less than ⅓ of elytron length); body shape slender (Fig. 2A); pronotum extensively dark (pale markings reduced to quite narrow medial area, often divided into two separate spots) (Fig. 2A); antenna segments 4–11 dark (Fig. 2A)................................. B. nesioticus Guignot, 1956, Published as part of Bergsten, Johannes, Ranarilalatiana, Tolotra & Biström, Olof, 2020, A new species of Bidessus from Anjozorobe-Angavo and a review of Malagasy Bidessus (Coleoptera, Dytiscidae), pp. 1-18 in European Journal of Taxonomy 720 on page 3, DOI: 10.5852/ejt.2020.720.1109, http://zenodo.org/record/4068355, {"references":["Bistrom O. & Sanfilippo N. 1986. Bidessus apicidens sp. n., and faunistic notes on the genus from Africa (Coleoptera, Dytiscidae). Annales Entomologici Fennici 52: 46 - 47.","Regimbart M. 1895. Revision des Dytiscidae et Gyrinidae d'Afrique, Madagascar et iles voisines. Memoires de la Societe entomologique de Belgique 4: 1 - 244.","Kolbe H. J. 1883. Uber die madagascarischen Dytisciden des K ˆ nigl. entomologischen Museums zu Berlin. Archiv fur Naturgeschichte 49 (1): 383 - 427.","Guignot F. 1941. Description de nouveaux Dytiscidae d'Afrique. Bulletin de la Societe d'Etude des Sciences naturelles de Vaucluse 11 (3 - 4) (1940): 31 - 39.","Gschwendtner L. 1933. Neue Schwimmkafer aus Belgisch Kongo. IV. Teil. Revue de Zoologie et botanique africaines 23: 84 - 95.","Guignot F. 1956. Contribution a la connaissance de la faune dystiscidienne Malgache. Le Naturaliste malgache 8: 75 - 80."]}