Tinodes aviformis Peng & Sun, 2024

Peng, Lang, Deng, Zhen, Zhang, Yu-hua, Wang, Meng, Sun, Chang-hai & Wang, Bei-xin, 2024, Seven new species and four new records of Psychomyiidae (Insecta, Trichoptera) from China, ZooKeys 1188, pp. 197-218 : 197

Tinodes aviformis Peng & Sun sp. nov.

Fig. 7A-E

Type materials.

Holotype: China • 1♂; Hainan Province, Sanya City, Tianya district, Fuwan reservoir; 18°16.80'N, 109°28.94'E; alt. 60 m; 25-vii-2022; light trap; L. Peng & H. Zang leg.; NJAU Tricho-20220725-0003.

Diagnosis.

This species is similar to Tinodes igok Kimmins, 1955 from Malaysia in the composition and morphology of the male genitalia, but it can be distinguished by: (1) two unpaired inner branches of the phallic sheath processes, of which one is short and straight and the other one curved, whereas both branches are curved in T. igok ; (2) the mesal digitate process of each coxopodite is shorter than the harpago, curved, and with a sharp apex in ventral view, but is undulated and almost the same length as the harpago in T. igok ; and (3) the phallic guide is divided into two branches with the dorsal one extending backward beyond the coxopodites in lateral view, rather than having only one uncinate branch that is not longer than the coxopodites in T. igok .

Description.

Male. Length of each forewing 3.1 mm (n = 1). Specimen in alcohol with compound eyes black, antennae yellowish white; thorax and legs brown, wings light brown without any distinctive markings; abdomen dark brown dorsally, pale yellow ventrally. Genitalia. Sternum IX transversely subrectangular in ventral view (Fig. 7A ); subtriangular in lateral view (Fig. 7C ). Tergum IX covered with microchaetae, with anterior margin slightly sinuate and middle of posterior margin produced posterad in dorsal view (Fig. 7B ); broader and subapically angled slightly caudad in lateral view (Fig. 7C ). Segment X membranous, closely fused with tergum IX, its posterior margin nearly truncate in dorsal view (Fig. 7B ); subrhomboid in lateral view (Fig. 7C ). Superior appendages each with distal half setose, clavate, and with apex rounded in lateral view (Fig. 7C ); parallel-sided in dorsal view (Fig. 7B ). Phallic sheath process consisting of paired lateral branches and unpaired inner branches; paired lateral branches compressed and spoon-like, semicircular, and resembling nesting bird in lateral view (Fig. 7C, E ), each with several strong spines at middle near ventral edge and distal half setose; fused basally, resembling pair of clam shells in ventral view (Fig. 7D ); two unpaired inner branches strongly sclerotized (Fig. 7D, E ); one of them straight, one curved; phallus slightly extending beyond tip of phallic sheath process, with distal end membranous in ventral view (Fig. 7D ), base and apex swollen in lateral view (Fig. 7E ); ejaculatory duct slender, with subapex S-shaped in lateral view (Fig. 7C ). Phallic guide with subapex wider and then divided into two branches in lateral view (Fig. 7C ), dorsal branch slender, curved downwards distally and gradually narrowed to sharp apex; ventral branch short. Coxopodites elliptical in lateral view (Fig. 7C ); fused with each other basally in ventral view (Fig. 7A ), each with posterodorsal angle digitate and posterior margin having tiny submesal digitate process; harpago setose, small, and simple (Fig. 7A, C ).

Etymology.

The Latin masculine adjective Tinodes aviformis , meaning “bird-shaped,” and refers to the shape of the pair of lobes of the lateral phallic sheath process in lateral view.

Distribution.

China (Hainan).

Figures

Figure 7. Tinodes aviformis sp. nov., male adult, holotype A genitalia, ventral B genitalia, dorsal C genitalia, left lateral D phallic complex, ventral E phallic complex, left lateral. Abbreviations: ste. IX = sternum IX; ter. IX = tergum IX; seg. X = segment X; sup. app. = superior appendage (paired); cox. = coxopodite (paired); har. = harpago (paired); pha. = phallus; pha. gui. = phallic guide; inn. pha. she. pro. = inner phallic sheath process; lat. pha. she. pro. = lateral phallic sheath process (paired); eja. duc. = ejaculatory duct.