Plectrocnemia bifoliolata Zhong, Yang & Morse

Zhong, Hua, Yang, Lian-Fang & Morse, John C., 2012, The genus Plectrocnemia Stephens in China (Trichoptera, Polycentropodidae), Zootaxa 3489, pp. 1-24 : 20-22

Plectrocnemia species incertae sedis

We are unable to place the following 4 species in any known species group of Plectrocnemia .

Plectrocnemia bifoliolata Zhong, Yang & Morse , sp. nov. ( Fig. 11 )

Adult. Length of each male forewing 6.9 mm (N = 1). Head of specimen in alcohol yellow with yellowish antennae, pronotum yellowish, meso- and metanota brown with yellowish warts, forewings gray with black setae.

Male genitalia. Sternum IX highly sclerotized, ventral half with anterior margin acutely protruding and posterior margin bluntly produced in lateral view ( Fig. 11 B); in ventral view ( Fig. 11 A), with shallow U–shaped concavity on anterior margin and broad, shallow concavity on posterior margin; tergum IX semi-membranous, broad and short in dorsal view ( Fig. 11 C). Tergum X incised apicomesally in V-shape ( Fig. 11 C); intermediate appendages not obvious, evident only as thickened strips along ventral margins of tergum X. Preanal appendages subrectangular in lateral view ( Fig. 11 B), each with semicircular, apicoventral excision; its mesoventral process broad, subtriangular in basal half, embracing phallus ventrally in ventral view ( Fig. 11 E), its distal half slender, extending beyond dorsal lobes of inferior appendages in lateral view ( Fig. 11 B). Inferior appendages short, without mesal plates and digitate processes; each in lateral view ( Fig. 11 B) with apex divided into 2 lobes: dorsal lobe with apex acute and tilted upward, ventral lobe shorter and blunt; in ventral view ( Fig. 11 A), lower, inner lobe 2 times as broad as outer one and with subtruncate apex. Phallus tubular, with pair of oval protrusions set laterally near base, pair of long, needle-like parameres present ( Fig. 11 D).

This new species is somewhat similar to Plectrocnemia potchina Mosely 1942 from China (Fu-jian) in the general shape of the male genitalia. It differs in the following characters: 1) the inferior appendages are each divided into 2 lobes, the dorsal lobes are slightly broader than the ventral lobes, each lobe with its narrowed apex tilted upward in lateral view, the ventral lobes are shorter and with truncate apices in ventral view (apex divided into 2 lobes, with dorsal lobes much broader than ventral lobes, each with truncate apex not tilted in lateral view, ventral lobes triangular in ventral view in P. potchina ); 2) the preanal appendages are rectangular, each with an apicoventral excision in lateral view (oval, without an apicoventral excision in P. potchina ); and 3) the mesoventral processes of the preanal appendages are not divided (each 3-forked in P. potchina ).

Holotype male: Jiang-xi Province: Mt. Wu-Yi National Nature Reserve, unnamed tributary of Tong-Mu River, N27.8342°, E117.7386°, alt. 1105 m, 0 2 June 2005, Coll. Yang L-f.

Etymology. Latin, “bilobed,” indicating the shape of the apex of each inferior appendage. Distribution. China (Jiang-xi).

Plectrocnemia wuyiensis Zhong, Yang & Morse , sp. nov. ( Fig. 12 )

Adult. Length of each male forewing 7.6 mm (N = 1). Head of specimen in alcohol brown with yellowish antennae, pronotum dark yellowish, meso- and metanota brown with yellowish warts, wings brown.

Male genitalia. Sternum IX highly sclerotized, ventral half with anterior margins strongly protruded forward in triangle and posterior margins straight in lateral view ( Fig. 12 B); in ventral view ( Fig. 12 A), segment IX narrowed and with small rounded excision anteriorly, its broad posterior margin with shallow and wide concavity and slight protrusion mesally; tergum IX membranous, rectangular, almost 3 times as wide as long in dorsal view ( Fig. 12 C). Mesal portion of tergum X membranous with small apicomesal incision, lateral portions highly sclerotized and forming pair of stout, hook-like processes each with acute apex curved laterad; intermediate appendages highly sclerotized, broad in lateral view ( Fig. 12 B), each with apex narrowing to spine, extending beyond preanal appendages. Preanal appendages oblique, horizontally short and vertically broad, approximately 3 times as high as long; each with its mesoventral process broad, highly sclerotized, apically divided into 2, widely separated, hornlike processes ( Fig. 12 F). Inferior appendages without mesal plates and digitate processes, main body of each appendage subrectangular and with its apicodorsal end strongly produced in stout process directed dorsomesad in lateral view ( Fig. 12 B); in ventral view ( Fig. 12 A), these appendages simply subrectangular. Phallus well sclerotized, thick, tubular, with pair of short, thick paramere spines broadest basally and gradually narrowing to acute apices ( Fig. 12 D, 12E).

This new species is similar to P. varouna Schmid 1961 from Pakistan, differing in the following characters: 1) tergum X has intermediate appendages that are highly sclerotized and hooked (without intermediate appendages in P. varouna ), 2) the mesoventral process of each preanal appendage has its apex divided into 2, widely separated, horn-like processes (with hooked but undivided apex in P. varouna ), 3) the inferior appendages are subrectangular in lateral view, each with its apicodorsal end strongly produced in a stout process directed dorsomesad, (triangular, without an apicodorsal process in P. v a ro u n a).

Holotype male: Jiangxi Province: Mt. Wu-Yi National Nature Reserve, unnamed tributary of Tong-Mu River, 18 km upstream of Mt. Wu-Yi Station, N27.8275°, E117.7436°, alt. 1450m, 0 2 June 2005, Coll. Sun C-h.

Etymology. The species name is derived from the name of “Mt. Wu-yi,” the type locality of this new species.

Distribution. China (Jiang-xi).

Figures

FIGURE 11. Plectrocnemia bifoliolata sp. nov., male genitalia. A, ventral view; B, left lateral view; C, dorsal view; D, phallus, left lateral view; E, mesoventral processes of preanal appendages, ventral view; F, right inferior appendage, caudal view. inf. app. = inferior appendage; m. v. pro. = mesoventral process of a preanal appendage; para. = paramere; pre. app. = preanal appendage; s. IX = sternum IX; t. IX = tergum IX; t. X = tergum X.

FIGURE 12. Plectrocnemia wuyiensis sp. nov., male genitalia. A, ventral view; B, left lateral view; C, dorsal view; D, phallus, left lateral view; E, phallus, dorsal view; F, right X and preanal appendage, caudal view; inf. app. = inferior appendage; int. app. = intermediate appendage; m. v. pro. = mesoventral process of a preanal appendage; para. = paramere; pre. app. = preanal appendage; s. IX = sternum IX; t. IX = tergum IX; t. X = tergum X.