Limnogeton expansum Montandon 1896

Limnogeton expansum Montandon, 1896 (Figs. 1 A���E) Limnogeton expansum Montandon, 1896: 519. Limnogeton expansum: Poisson (1949): 7. Limnogeton expansum: Linnavuori (1971): 356. Types. Limnogeton expansum was described based on a holotype from Tanganyika (Democratic Republic of Congo), Africa, deposited in ISNB according to Montandon (1896). Material examined. CONGO. Brazzaville, [��� 393 ���], [��� 92 ���], 1892, (Dybowsky), identified as L. expansum by A. L. Montandon in 1899, J. R. I. Ribeiro det. 2011: 1 f (MNHN); Haute-Sanga, (P. A. Ferri��re 106 - 97): 1 m (MNHN). CAMEROON. Batouri, M. [?] de Lisle, ���MUS��UM PARIS //P. Lepesme R. Paulian//A. Villiers, 1939, ��� 42 ������, J. R. I. Ribeiro det. 2011, (identified as L. fieberi): 2 m (MNHN). Distribution. Tanganyika (Democratic Republic of Congo) and Kilimandjaro (Tanzania) (Poisson 1949; Linnavuori 1971). This species is newly recorded herein from Batouri (Cameroon) and Brazzaville and Haute- Sanga (Congo). Measurements (m / f): Total length (from apex of head to apex of abdomen at rest): 50.0��� 57.2 / 54.1; greatest width of body: 24.0��� 27.2 / 26.5. General coloration. Almost uniformly brown. Body ovate with wings covering abdomen. Head, thorax, and abdomen. Pronotum with longitudinal median carina (Fig. 1 A, LMC) extending only onto posterior portion; prosternal keel elongate and slightly directed anteriorly at apex, straight, robust, cylindrical, with its apex acute, slightly projecting anteriorly (Fig. 1 B, PC). Pilosity developed, covering half of connexivum, slightly constricted between spiracles, not extending posteriorly along genital operculum (Fig. 1 C, PIL). Male genitalia: Parameres symmetrical, both with apex curved and poorly hooked; left one strongly edentate, the other smoothly curved; length of phallotheca about 1.4 times ventral diverticulum in dorsal view; ventral diverticulum robust; dorsal arms of phallotheca strongly divergent, symmetrical, connected or fused along basal portion, V-shaped and abruptly narrowed at apex in dorsal view (Fig. 1 D); lateral outer margins of ventral diverticulum almost straight (Fig. 1 E), ventral diverticulum with anterior margins broader, becoming narrow posteriorly (Fig. 1 E). Taxonomic notes. Males of this species can be readily distinguished from the other species of Limnogeton by having the dorsal arms of ventral diverticulum robust, V-shaped, and conspicuously acute at the apex (Fig. 1 D).
Published as part of Ribeiro, Jos�� Ricardo I., Meyin-A-Ebong, Solange E., Le-Gall, Philippe & Guilbert, Eric, 2014, A taxonomic synopsis of Limnogeton Mayr, 1853 (Insecta: Hemiptera: Heteroptera: Belostomatidae), pp. 573-584 in Zootaxa 3779 (5) on page 575, DOI: 10.11646/zootaxa.3779.5.7, http://zenodo.org/record/225225
{"references":["Montandon, A. (1896) Hemipteres heteropteres exotiques. Notes et descriptions. Annales de la Societe Entomologique de Belgique, 40, 508 - 520.","Poisson, R. A. (1949) Hemipteres aquatiques. Exploration du Parc National Albert (Mission G. F. de Witte (1933 - 1935), 58, 1 - 94.","Linnavuori, R. (1971) Hemiptera of the Sudan, with remarks on some species of adjacent countries. 1. The aquatic and subaquatic families. Annales Zoologici Fennici, 8, 340 - 366."]}