Fig. 2m -o
Description of worker
Holotype. HL 0.698, HW 0.529, HW1 0.562, CI 76, SL 0.443, SI 84, PW 0.418, ML 0.861, EL 0.197, EI 37.
Mandibles with fine longitudinal striations. Clypeus predominantly smooth, with weak longitudinal striations. Entire anterior margin of clypeus evenly convex. Eyes with 16 ommatidia in a longest row. Scapes relatively short (SI <85). With head in dorsal view hind margin convex. With mesosoma in profile, dorsal margins of promesonotum and propodeum each convex, with metanotal groove conspicuously impressed. Propodeum hump-shaped in profile, unarmed, with dorsum rounding evenly into declivity. Metapleural lobes low and rounded. Anterior peduncle long and narrow. Subpetiolar process vestigial, visible as a shallow obtuse angle. Petiolar node in profile massive and nodiform with anterior face angled at about 45° whereas posterior face is nearly vertical. Postpetiole low and rounded. Ventral margin of postpetiole in profile obtusely angled, without distinct process. Dorsum of head weakly shining with faint reticulate ground-sculpture; weakly striated between the eyes and more strongly striated between base of antenna and the eyes. Promesonotal dorsum finely reticulate. Propodeal dorsum with irregular reticulate ground sculpture overlaid by faint irregular transverse striations. Base of declivity with strongly developed transverse striations. Petiolar node and postpetiole with irregular sculpture; transverse striations on peduncle and vestigial transverse striations on petiolar node. Base of first gastral tergite witha ring ofshort costulae; remainder of the tergite predominantly shiny with weak reticulate pattern. Dorsum of head and mesosoma with appressed white, scattered pubescence, no erect hairs. The venter of head with three straight hairs. Propodeum without hairs. Petiolar node and postpetiole each with a pair of backwardly projecting fine long acute hairs in each. First gastral tergite with scattered, short, decumbent hairs, acute apically; with longer erect hairs along the posterior margin and on the sternite. Colour brick red with gaster dark brown.
Paratypes . HL 0.688-0.718, HW 0.531-0.541, HW1 0.565-0.590, CI 75-77, SL 0.462-0.470, SI 87, PW 0.393-0.423, ML 0.859-0.895, EL 0.194-0.207, EI 36-38 (2 of 2 measured). Same data as holotype.
Diagnosis
Among the species without hairs on the propodeum ( N. larsenae , N. ruani , N. entabeni and N. nanniae ), N. larsenae is distinguished by lacking erect hairs on the promesonotum, and also distinguished by its hump-shaped propodeum and by the brick red colour, with gaster dark brown; the other three species have erect hairs on the promesonotum, the propodeum forms an even convexity (not hump-shaped), and their colour is uniformly medium brown.
Biology
Two specimens were collected from pitfall traps and one specimen from sweeping vegetation inSucculent Karoo near Nieuwoudtville in the Northern Cape. Probably ground-nesting but sweep sample shows that it does forage in vegetation.
Etymology
Named after Dawn Larsen, one of the collectors, who is an Assistant Collections Manager in the entomology collection of the Iziko South African Museum.
Material examined
Holotype: South Africa: Northern Cape: west of Driefontein farm, Succulent Karoo 2 site (10.7 km 109° ESE Nieuwoudtville), 31°22.581'S 19°13.507'E, 12-19 October 2000, H.G. Robertson, D. Larsen & R. Adams; NW00-SK2- P05, SAM-HYM-C019131.
Paratype workers with same data as holotype except NW00-SK2-P04, SAM-HYM-C019130, NW00-SK2-Sweep 228, SAM-HYM-C019132.
Nesomyrmex larsenae is een mierensoort uit de onderfamilie van de Myrmicinae.[1][2] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 2008 door Mbanyana & Robertson.
Bronnen, noten en/of referenties
Латинское название Nesomyrmex larsenae Mbanyana & Robertson, 2008
Поиск изображений
на Викискладе
Nesomyrmex larsenae (лат.) — вид мелких муравьёв рода Nesomyrmex (Formicidae) из подсемейства Myrmicinae[1].
Южная Африка (Northern Cape)[1].
Длина головы (HL) 0.688–0.718 мм; ширина головы (HW) 0.531–0.541 мм; головной индекс (CI) 75–77; длина скапуса (SL) 0.0.462–0.470 мм; индекс скапуса (SI) 87. Промезонотум без отстоящих волосков. Проподеум округлый без шипиков. Брюшко гладкое и блестящее. Усики 12-члениковые с булавой из 3 сегментов. Жвалы с 5 зубцами. Стебелёк между грудкой и брюшком состоит из двух члеников: петиолюса и постпетиолюса (последний четко отделен от брюшка), жало развито. Мелкие почвенные муравьи (длина около 3 мм) красновато-коричневого цвета (брюшко темнее), похожие на представителей рода Leptothorax[1].
Вид включён в состав группы simoni species-group (Formicoxenini, или Crematogastrini). Близок к видам Nesomyrmex nanniae, Nesomyrmex ruani и Nesomyrmex entabeni с невооружённым проподеумом, непокрытом волосками. Ранее представители рода рассматривались в составе рода Leptothorax. Вид был впервые описан в 2008 году африканскими энтомологами Н. Мбанияна (Nokuthula Mbanyana) и Х. Робертсоном (Hamish G. Robertson; Natural History Collections Department, Iziko South African Museum, Кейптаун, Южная Африка) по материалам из Южной Африки. Видовое название дано в честь Д. Ларсена (Dawn Larsen; Iziko South African Museum), участника сборов коллекционного материала муравьёв[1].
Nesomyrmex larsenae (лат.) — вид мелких муравьёв рода Nesomyrmex (Formicidae) из подсемейства Myrmicinae.
