Osmylus biangulus, Wang & Liu, 2010

Wang, Yongjie & Liu, Zhiqi, 2010, New species of Osmylus Latreille from Henan, China (Neuroptera: Osmylidae), Zootaxa 2363 (1), pp. 60-68 : 61-63

Osmylus biangulus sp. nov.

( Figs 1 , 5–11 )

Diagnosis. Wing broad, veins fuscous. Male: 9 th tergite with a finger-like dorsal process; ectoproct coneshape. Gonarcus with sclerotized distal part, almost papillary with two triangular ventral processes and one dorsal process in lateral view. Baculum with base dilated. Female: gonapophysis lateralis fused with a triangular sclerite at base, spermatheca cylindrical.

Description. Head. Vertex dark brown. Ocelli slight grey, ocellar triangle region black, eyes brown. Antenna fuscous with brown setae, scape black. Frons black; labrum brown, labial palp and maxillary palp yellow. Thorax. Pronotum black, with long black setae. Meso- and metanotum black, with yellow setae. Legs brown, with yellow setae. Pretarsal claws brown, finely pectinate. Wings ( Fig. 1 ). Forewing length 24.3–27.7 mm, width 8.3–9.1 mm. Coloration of membrane dull hyaline, with numerous tan spots on the margin; outer gradate cross-veins edged with some dispersed brown marks; cubital region partly mottled with dark brown; pterostigma yellow with brown patches; nygmata round, distinctly dark brown; venation tan; Rs with 15–17 branches, MP fork presenting between the separation of MA from Rs and the first branch of Rs. Hindwing length 21.2–23.9 mm, width 7.1–7.6 mm. Wings relatively broad; membrane hyaline with pterostigma and nygmata brown. Male terminalia ( Figs 5–9 ). 8 th tergite broad; 8 th sternite quadrate; scent glands present, the dark reservoirs with a stout process, membranous evaporative lobe appreciably extending from tergum; 9 th tergite oblique, base narrow, with a fingerlike process; 9 th sternite approximately triangular, base convex; ectoproct small, cone-shape; callus cerci large and oval; gonarcus extremely protruded and well sclerotized, with two membranous triangular ventral processes and one dorsal process at base; baculum (interpret as 9 th gonapophyses by Aspöck & Aspöck (2008)) dilated at base in lateral view, articulated with gonarcus; paramere L-shaped laterally, base expanded and approximately triangular; a rod articulated with it bent distinctly at mid-point. Female terminalia ( Figs 10–11 ). 8 th tergite trapezoidal; 8 th sternite small and quadrate; 9 th tergite narrow, constricted adjacent to callus cerci in lateral view; produced posteroventral convex process; ectoproct conical; callus cerci round, presenting in middle; gonapophysis lateralis narrow rhomboid, a triangular sclerite fused in base; spermatheca simple and cylindrical.

Distribution. Presently known only from Henan province, China.

Material examined. Holotype Male, CHINA: Henan [Province]: Songxian [county]: Baiyunshan [mountain], 1500m. 15–20.VIII.2000, leg. Shen, Ren, Liu & Wang. Verbatim label data (translated from Chinese): CHINA: Hennan, Songxian, Baiyunshan. 1500m / 15–20.VIII.2000 / Ren, Shen, Liu, Wang. Condition: Excellent, the tip of the left antennae missing. Terminalia cleared in KOH, and stored in the microvial pinned below the specimen.

Paratypes. 5 males (three lacking abdomens), 1 female, same data as holotype; male, female, same locality as holotype. Light trap. 15.VII.2004, leg. Bingzhen Yan.

Etymology. The specific name refers to the two ventral triangular projections of gonarcus, which is the compound of Latin bi - (two) and angulus (angle).

Remarks. Osmylus biangulus sp. nov. possesses a fingerlike dorsal process in 9 th tergite, which differentiates it from other species that lack the process ( Osmylus tessellatus, McLachlan, 1875 , Osmylus conanus Yang, 1987 , Osmylus megistus Yang, 1987 , Osmylus xizangensis Yang et al., 1988 , Osmylus fuberosus Yang, 1997 , Osmylus wuyishanus Yang, 1999 ,). Osmylus pryeri McLachlan, 1875 and Osmylus decoratus Nakahara, 1914 have a similar process, but this new species can be identified by the shape of gonarcus. The gonarcus of Osmylus biangulus sp. nov. has two triangular ventral processes, which is distinctly different from O. pryeri (with a distal sclerotized ventral process) and O. decoratus (with two distal processes).

Figures

FIGURES 1–4. Wings of new Osmylus species. 1. Osmylus biangulus sp. nov. 2. Osmylus lucalatus sp. nov. 3. Osmylus bipapillatus sp. nov. 4. Osmylus pachycaudatus sp. nov.

FIGURES 5–11. Osmylus biangulus sp. nov. 5–9, male: 5, apex of abdomen and genitalia, lateral; 6, genitalia, lateral; 7, genitalia, dorsal; 8, paramere, lateral; 9, paramere, dorsal. 10–11, female: 10, apex of abdomen and genitalia, lateral; 11, spermatheca, lateral. (spiracula omitted)