Psychomyia obtorta, Peng & Wang & Sun, 2020

Peng, Lang, Wang, Bei-Xin & Sun, Chang-Hai, 2020, Four new species of Psychomyia (Trichoptera: Psychomyiidae) from China, with re-descriptions of two species, Zootaxa 4860 (2), pp. 227-242 : 232

Psychomyia obtorta n. sp.

( Figs 3 a–3c)

Description: Length of each forewing 2.73 mm (n = 1). Specimens in alcohol with compound eyes black, body and wings brown and abdomen pale yellow. Forewings with forks II, III, IV, and V present, with crossveins r, s, m-cu and m forming an arc; hind wings with forks II, III, and V present, R 1 atrophied, R 2+3 ending at Sc ( Fig. 7c ).

Male genitalia: Posterior margin of sternum IX slightly concave at midheight in lateral view ( Fig. 3a ); tergum IX and preanal appendages fused completely, setose; in lateral view (pre.app. in Fig. 3a ) each with basal 2/3 somewhat elliptical and distal 1/3 producing into finger-like process, with small tooth at each upper and lower margin; in dorsal view ( Fig. 3b ), fused tergum IX + preanal appendages L-shaped, with acute spine basomesally and apical angles rounded. Coxopodites large, triangular in lateral view (cox. in Fig. 3a ), semicircular in ventral view ( Fig. 3c ). Harpagones large (har. in Fig. 3a ), each three-branched: basolateral branch with subapices slightly constricted in lateral view, with distal end heavily setose; in ventral view slender ( Fig. 3c ), somewhat bar-shaped; other two branches of harpagones fused to midlength, lateral branch more or less beak-shaped in lateral view, with distal 1/3 abruptly curved downwards and having one strong seta mesally; mesal branch slightly curved upwards. Phallic apparatus (end. in Figs 3 a–3c) with endotheca strongly sigmoid in lateral view, and with one pair of basal processes.

Diagnosis: This species belongs to Schmid’s P. flavida Species Group, resembling Psychomyia neboissi Schmid 1997 in the shaped of the fused tergum IX + preanal appendages, and P.itoae Schmid 1997 , P.nimmoi Schmid, 1997 , both from India and P. amor Malicky & Chantaramongkol 1997 from Thailand, and P. kalais Malicky 2004 from Indonesia in the shape of the two dorsal processes of the harpagones which are separate at the midlength. However, the new species differs from P. neboissi by the following characters: (1) the ventral margin of each fused tergum IX + preanal appendage of the new species has a small triangular tooth, and (2) the dorsal processes of each harpago of the new species separate at their midlength, rather than subapically as in P. neboissi . It also can be diagnosed from the other species by the beak-shaped apex of the lateral branch of each harpago and the slightly constricted subapex of the basolateral branch in lateral view.

Holotype: Male, P. R. China, Jiang-xi Province , Long-nan County, Da-qiu-tian Conservation Station of Jiulian-shan National Nature Reserve, 24°21′00″N, 114°16′12″E, alt. 377 m, 10 June 2005, leg. L. Yang ( NJAU).

Distribution: China (Jiang-xi).

Etymology: The Latin adjective obtortus, -a, -um means “twisted”, referring to the shape of the harpagones which are slightly twisted.

Figures

FIGURE 3. Male genitalia of Psychomyia obtorta n. sp. 3a, left lateral; 3b, dorsal; 3c, ventral. Abbreviations: cox. = coxopodite (paired); end. = endotheca; har. = harpago (paired); pha. = phallotheca; pre. app. = preanal appendages (paired). Scale bar refers to all figures 3a–3c.

FIGURE 7. Wing venations of psychomyiid species. 7a, Psychomyia complexa Li, Morse & Peng, n. sp.; 7b, Psychomyia conoidea n. sp.; 7c, Psychomyia obtorta n. sp.; 7d, Psychomyia tripetala n. sp.; 7e–7f, Psychomyia extensa Li, Sun & Yang 1999; 7g–7h, Psychomyia martynovi Hwang 1957. Scale bar refers to all figures 7a–7h. Scale bar refers to all figures 7a–7h.