Miyamotoia Morino 2020

Miyamotoia Morino, 2020 Miyamotoia Morino, 2020: 2. Type species. Miyamotoia spinolabrum Morino, 2020, original designation. Included species. Miyamotoia contains 2 species: M. daitoensis Morino, 2020; M. spinolabrum Morino, 2020. Category. Mascupod. Ecological type. Forest-hopper. Habitat. Humid forests. Diagnostic description ( male ). Based on Morino (2020). Head. Antenna 2 peduncular articles slender . Mandible left lacinia mobilis 5-cuspidate. Labium without inner lobes. Maxilliped palp article 2 with distomedial lobe; article 4 reduced, button-shaped. Pereon. Gnathopod 1 sexually dimorphic; subchelate; coxa slightly smaller than coxa 2; posterior margin of carpus and propodus each with lobe covered in palmate setae; propodus anterior margin with 3 or with 4 groups of robust setae, ���subtriangular��� with well-developed posterodistal lobe, palm transverse; dactylus simplidactylate. Gnathopod 2 subchelate; propodus palm acute; propodus palm evenly rounded, without palmar sinuses; without proximal spine or thumb defining palm, without large projection near dactylar hinge; dactylus short, recurved distally or attenuated distally (short). Pereopods 3���7 dactyli bicuspidactylate. Pereopod 4 subequal or slightly shorter than pereopod 3; carpus significantly shorter than that of pereopod 3; dactylus amplidactylate, thickened proximally with notch midway along posterior margin or short with mini-wavy posterior margin. Pereopod 6 subequal in length to pereopod 7, not incrassate; basis moderately expanded; male merus and carpus not expanded. Pereopod 7 not incrassate; basis broadly expanded; posterior margin with distinct minute serrations, each with a small seta, posterodistal lobe present, shallow, narrowly rounded; merus unexpanded; carpus unexpanded; propodus broad, 6.1 �� width, without large distal tuft of setae. Oostegites (female) setae with simple smooth tips. Pleon. Pleopods all reduced . Uropod 1 peduncle distolateral robust seta present or absent; exopod without marginal robust setae; endopod with marginal robust setae in 2 rows. Uropod 2 exopod with marginal robust setae in 1 row; endopod with marginal robust setae in 2 rows. Uropod 3 ramus shorter than peduncle. Telson apically incised, with 3 to at least 10 robust setae per lobe. Remarks. Miyamotoia is similar to Laniporchestia from Hawaii. See remarks under Laniporchestia. Miyamotoia is also similar to Tethorchestia. The main differences are gnathopod 1 dactylus is simplidactylate (cuspidactylate in Tethorchestia), pereopod 7 propodus without a large, distal tuft of setae (present in Tethorchestia), uropod 1 peduncle without a distolateral robust seta (present in Tethorchestia) and the endopod of uropod 1 with marginal setae in two rows (one row in Tethorchestia). Distribution. Japan: Ogasawara Islands and Daitojima Islands, Southern Japan (Morino 2020).
Published as part of Lowry, J. K. & Myers, A. A., 2022, Platorchestiinae subfam. nov. (Amphipoda, Senticaudata, Talitridae) with the description of three new genera and four new species, pp. 1-53 in Zootaxa 5100 (1) on pages 29-30, DOI: 10.11646/zootaxa.5100.1.1, http://zenodo.org/record/6127681
{"references":["Morino, H. (2020) The Description of Two New Genera and Four New Species of the Terrestrial Talitridae (Crustacea, Amphipoda) from the Ogasawara and Daito Islands, Southern Japan. Bulletin of the National Museum of Natural Science, Series A, 46 (1), 1 - 23."]}