Psilotreta brevispinosa, Qiu & Yan, 2020

Qiu, Shuang & Yan, Yun-jun, 2020, The Psilotreta Banks, 1899 of the Dabie Mountains, east central China, with descriptions of two new species (Insecta: Trichoptera: Odontoceridae), European Journal of Taxonomy 601, pp. 1-11 : 8-10

Psilotreta brevispinosa sp. nov.

urn:lsid:zoobank.org:act:438E2AA5-6111-45E0-AF2B-410A67810EA9

Fig. 3

Diagnosis

The male genitalia of this new species stand apart from those of other species of Psilotreta species by the huge superior appendages, the absence of an intermediate appendage and the short, anteriorly curved lateral process of segment X.

Etymology

The specific name is derived from the Latin ‘brevi-’ and ‘spinosa’, meaning ‘short’ and ‘spines’, referring to the pair of short spines on the lateral process of segment X.

Material examined

Holotype

CHINA – Henan Province • ♂; Xinyang County, Tian-mu-shan Nature Preserve , near the ranger’s cabin; 32°34'34.00" N, 113°48'23.67" E; 215 m a.s.l.; 9 Apr. 2015; Qiu Shuang and Liu Tian-yu leg.; hand net; NAU.

Description

Male

HEAD. Head brown, in anterior view with short dark line in centre of frons ( Fig. 3A ); frontogenal compact setal warts large, approximately 2 × as long as wide, with dark line connecting ventral end of each setal wart and clypeus. Anterior tentorial pits located very close to clypeus. In dorsal view with dark median dorsal line ( Fig. 3B ). Median dorsal line branched and extending to bases of antennae, between vertexal mediantennal compact setal warts and vertexal lateroantennal compact setal warts, and present with curved horizontal branches posteriorly. Vertexal lateroantennal compact setal warts smaller than vertexal mediantennal compact setal warts. Occipital setal warts oval, smaller than oval postgenal setal warts. Maxillary palps lost in the dissection process.

WINGS. Forewings each 7.7 mm (n = 1), dark brown; DC present, fork I slightly longer than fork II, R 4+5 not fused with R 3, Cu 2 absent; row of setae located close to posterior margin of each forewing. Hind wing C with hump and row of setae in middle; R 1 disappearing after crossvein Sc-r; DC absent ( Fig. 3C ).

MALE GENITALIA. Tergum IX narrow in lateral view ( Fig. 3D ), fused with median dorsal process of segment X forming long thin process ( Fig. 3E ); sternite of segment IX truncate, with large anterior process in lateral view ( Fig. 3D ) and triangular concavity on posterior margin in ventral view ( Fig. 3F ). Lateral process of segment X with two pairs of short branches: apical branches round, with one short spine postero-ventrally; subapical branches forked into few acute ends in dorsal and lateral views ( Fig. 3H ). Superior appendages leaf-like in lateral view ( Fig. 3D ) and digitate in dorsal view ( Fig. 3E ), longer than dorsal process of Tergite IX. Coxopodites wider basally than apically in lateral and ventral views, with bases strongly sclerotized ( Fig. 3D, F ); harpagones about ⅓ as long as coxopodites, each with small spines and setae on apices ( Fig. 3F ). Phallotheca sclerotized, thin and long, slightly curved ventrally in lateral view ( Fig. 3G ), apex forked in ventral view ( Fig. 3I ); parameres present, slightly longer than height of phallotheca in lateral view ( Fig. 3G ), with apices curved posteriorly; endotheca and aedeagus membranes, ventral sclerite of aedeagus strongly curved in lateral view ( Fig. 3G ) and oval in ventral view ( Fig. 3I ).

Distribution

This species has been found only in Henan Province, China. The wider distribution is unknown.

Figures

Fig. 3. Psilotreta brevispinosa sp. nov. A. Head, anterior view. B. Head, dorsal view. C. Wing veins. D. Male genitalia, left lateral view. E. Male genitalia, dorsal view. F. Male genitalia, ventral view. G. Phallus, left lateral view. H. Segment X, left lateral view. I. Phallus, ventral view, with basal half of phallotheca omitted. Scale bars: A–C = 200 µm; D = 1 mm; E–K = 250 µm.