Plectrocnemia acuminata Morse, Zhong & Yang

Morse, John C., Zhong, Hua & Yang, Lian-fang, 2012, New species of Plectrocnemia and Nyctiophylax (Trichoptera, Polycentropodidae) from China, ZooKeys 169, pp. 39-59 : 41-42

Plectrocnemia acuminata Morse, Zhong & Yang sp. n. Fig. 2

Plectrocnemia acuminata Li 1998: 54-55, figs 3.13-3.15, nomen nudum.

Type specimens.

Holotype male, PRC, Si-chuan Province, Mt. Qing-cheng, Wei-jiang River, 32 km SW of Guan County (now, Du-jiang-yan City), 31.00°N, 103.60°E, 930 m elevation, 20-vi-1990, collected by JC Morse, Yang Lian-fang, Li You-wen; deposited in NAU.

Paratypes: PRC, Si-chuan Province: same data as hololype, 3 males (CUAC); Ya-an, Zhou-gong Stream branches, alt. 600-800 m elevation, 08-vi-1996, coll. Wang Bei-xin, 9 males (NAU); Mei-gu County, Mei-gu Da-feng-ding National Nature Preserve, Shu-wo-xiang village, Cha-cha-ku Stream, 8.3 km E of Long-wo, 28.7603°N, 103.2471°E, 1671 m elevation, 06-vii-2005, Coll. Sun Chang-hai, 1 male (NAU).

PRC, An-hui Province: Yang-jia-tan, Feng-yuan-shui Stream, Xi-xian County, 29.90°N, 118.45°E, 215 m elevation, 24-v-1992, collected by JC Morse, Sun Chang-hai, 4 males (NAU).

Diagnosis.

The male genitalia of this species are very similar to those of Plectrocnemia munitalis Mey, 1996 in the apically acute preanal appendages and in the presence of a hooked basodorsal process on each inferior appendage. However, the intermediate appendages of segment X are slender, longer than the inferior appendages in Plectrocnemia munitalis , but much shorter, and forming irregular, broad plates each with an acute posterior projection directed dorsolaterad in the new species.

Description of adult male:

Head and thorax dark brown with antennae and warts yellowish brown, forewings light brown. Length of body with folded wings: 7.0 - 9.0 mm. (n = 10).

Male genitalia. Highly sclerotized. Tergum IX fused basally with broader tergum X, with posterior margin narrower than anterior margin in dorsal view (Fig. 2C); sternum IX with anteromesal margin concave (Fig. 2B), anterolateral margins broadly protruding cephalad at middle, posterolateral margins sinuate (Fig. 2A). Intermediate appendages each short, irregularly broad plate beneath and beside tergum X, with acute posterior projection directed dorsolaterad (Figs 2A, 2C). Preanal appendages nearly twice as long as tergum X and inferior appendages, each cylindrical, with distal portion narrowing more or less evenly to acute apex, evenly curved mesad, with small conical ventrobasal projection and with short lobe projecting posterolaterad from its lateral surface near middle; ventral subphallic sclerite absent (Figs 2A, 2C). Inferior appendages depressed (flattened dorsoventrally), each evenly broad at basal half with lateral margin of distal half shallowly excised (Fig. 2B); basodorsal process of each inferior appendage slender, hooked dorsomesad (Figs 2B, 2A); basal setose lobe on dorsal base of each inferior appendage rounded (Fig. 2A), both basodorsal process and basal setose lobe hidden within segment IX. Phallus with long and broad phallobase somewhat constricted subapically; sclerotized ring near middle of phallus about 1/4th as long as phallobase; phallicata constricted subbasally, membranous apically, with pair of thin, short phallotremal sclerites visible from dorsal view (Fig. 2D).

Female and immature stages.

Unknown.

Etymology.

Acuminata, Latin adjective, “narrowed,” referring to the distal portion of each preanal appendage gradually narrowing to an acute apex.

Distribution.

Oriental Biogeographic Region, China (Si-chuan, An-hui).