Psychomyia tripetala Peng & Wang & Sun 2020, n. sp.
Creators: name: Peng, Lang
name: Wang, Bei-Xin
name: Sun, Chang-Hai
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Psychomyiidae
Psychomyia
Psychomyia tripetala

description: Psychomyia tripetala n. sp.
(Fig. 4 a–4e)
Description: Length of each forewing 2.7–3.0 mm (n = 10). Specimens in alcohol with compound eyes black, body brown. Forewings with forks II, III, IV, and V present, crossveins s, r, m-cu zigzagged; hind wings with forks II, III, and V present, fork III short, about 1/4 as long as its stalk, R 1 absent, R 2+3 ending at middle of Sc (Fig. 7d).
Male genitalia: Tergum and sternum IX distinctly separated. Tergum IX trilobed in dorsal view (l.l.IX and m.l.IX in Fig. 4c), lateral lobes trapezoidal with terminal margins slightly concave, median lobes fused with each other, clearly membranous, subrectangular, with distal margin slightly notched mesally; in lateral view (l.l.IX and m.l.IX in Fig. 4a) median lobe subrectangular, lateral lobes semicircular. Sternum IX subrectangular with triangular process on posterolateral margin in lateral view (Fig. 4a), trapezoidal in dorsal view with anterior margin slightly concave. Preanal appendages (pre.app. in Fig. 4a, 4c, 4d) large, slightly clavate in lateral view (Fig. 4a), setose; in dorsal view (Fig. 4c) each tapering from 1/5 length to distal end, each inner margin with strong seta subapically; in ventral view (Fig. 4d) with mesal surface less sclerotized, setose, and concave in distal 2/3. Coxopodites in lateral view subtriangular (cox. in Fig. 4a), in ventral view each with basomesal process slender and curved posterad (cox. in Fig. 4d); harpagones larger than coxopodites, in lateral view (har. in Fig. 4a) each with narrow base and bifurcate apex, dorsal branch finger-like, ventral branch semicircular; in ventral view (har. in Fig. 4d) with lateral margins parallel to each other, and ventral branches fused with each other in basal 3/4. Phallic apparatus in lateral view (Fig. 4a) having endotheca with basal half cylindrical and distal half expanded, upper margin convex posterodorsally, apicoventral margin produced into finger-like process; pair of long processes arising from base of endotheca (treated as “parameres” here) curved dorsad near base and pointing posterad at mid-length in lateral view, forked into pair of sinuous processes in ventral view.
Diagnosis: The species is unique in Psychomyia in having a trilobed tergum IX and a pair of paramere-like processes. These characters cause difficulty assigning it to any of Schmid’s species groups. However, by these unique two features, this new species can be easily diagnosed from the congeneric members.
Holotype: Male, P. R. China, Jiang-xi Province, Long-nan City, Da-qiu-tian Conservation Station of Jiu-lianshan National Nature Reserve, 24°21′00″N, 114°16′12″E, alt. 377 m, 10 June 2005, leg. L. Yang (NJAU).
Paratypes: 14 males, same data as holotype (NJAU).
Distribution: China (Jiang-xi).
Etymology: The Latin adjective tripetalus, - a, - um means “having three petals”, referring to the trifurcate ter- gum IX.
description: Published as part of Peng, Lang, Wang, Bei-Xin & Sun, Chang-Hai, 2020, Four new species of Psychomyia (Trichoptera: Psychomyiidae) from China, with re-descriptions of two species, pp. 227-242 in Zootaxa 4860 (2) on pages 232-235, DOI: 10.11646/zootaxa.4860.2.5, http://zenodo.org/record/4413725