Lype sagittalis 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

Lype sagittalis Peng & Sun sp. nov.

Fig. 4A-E

Type materials.

Holotype: China • 1♂; Hunan Province, Shaoyang City, Suining County, Jiuxi Bamboo Tower Villa; 26°24.39'N, 110°05.68'E; alt. 630 m; 25-v-2021; light trap; L. Peng leg.; NJAU Tricho-20210525-0001. Paratypes: China • 1♂; same data as holotype; NJAU Tricho-20210525-0002 • 1♂; Hunan Province; Shaoyang City, Suining County, Guanyinxing; 26°24.77'N, 110°05.39'E; alt. 550 m; 28-v-2021; light trap; L. Peng leg.; NJAU Tricho-20210528-0001.

Diagnosis.

This species is similar to Lype lubaretsi Arefina, 2005 from Russia. However, the new species can be easily distinguished by the following characteristics: (1) longitudinally, sternum IX of L. sagittalis sp. nov. is subtriangular in lateral view, rather than subrectangular in L. lubaretsi ; (2) each of the coxopodites of the new species is subcircular in lateral view, but elliptical in L. lubaretsi ; (3) the fused coxopodites in ventral view have a narrow mesal notch in the new species, rather than with a wide mesal notch in L. lubaretsi ; (4) the aedeagus is sagittal, with its apex truncate in dorsal view and pipe-shaped in lateral view in L. sagittalis sp. nov., but nearly triangular with apex broad in ventral view, triangular with a sharp apex in lateral view in L. lubaretsi .

Description.

Male. Length of each forewing 4.2-4.4 mm (n = 3), holotype 4.4 mm. Specimens in alcohol with compound eyes black; antennae, legs, and thorax brown; wings light brown without any distinctive markings; abdomen dark brown dorsally, pale yellow ventrally. Genitalia: Sternum IX subrectangular, anterior margin shallowly concave, posterior margin more deeply concave in ventral view (Fig. 4A ); subtriangular in lateral view (Fig. 4C ). Tergite IX covered with fine microchaetae, subtriangular with distal end truncate in dorsal view (Fig. 4B ); tongue-shaped in lateral view (Fig. 4C ), broadly fused with segment X. Segment X subrectangular and almost surrounding phallic apparatus in lateral and ventral views (Fig. 4C, E ); apex excised mesally in dorsal view (Fig. 4B ). Superior appendages elongate-oval in dorsal view (Fig. 4B ); lanceolate, tilted posterodorsad in lateral view (Fig. 4C ). Coxopodites each subcircular in lateral view (Fig. 4C ); bases fused with each other in ventral view and with narrow notch between them apically about half their length, each with setose posteromesal corner produced caudad (Fig. 4A ). Harpagones twice as long as coxopodites, each more-or-less parallel-sided, each with lower margin slightly concave, upper margin sinuate in lateral view (Fig. 4C ); the pair divergent basally, evenly curved laterad and mesad to become somewhat forcipiform, with bases and distal ends enlarged in ventral view (Fig. 4A ). Phallotheca massive, constricted at middle in lateral view (Fig. 4C ), with apical margin membranous. Aedeagus sclerotized, depressed, broad in dorsal and ventral views (Fig. 4D, E ); pipe-shaped in lateral view (Fig. 4C ). Subapical projection of aedeagus sclerotized, finger-like in lateral and dorsal views (Fig. 4C, D ).

Etymology.

The Latin feminine adjective Lype sagittalis , meaning “arrow-shaped”, and refers to the shape of the aedeagus in dorsal and ventral views.

Distribution.

China (Hunan).

Figures

Figure 4. Lype sagittalis sp. nov., male adult, holotype A genitalia, ventral B genitalia, dorsal C genitalia, left lateral D phallotheca apex, dorsal E phallotheca apex and segment X, ventral. Abbreviations: ste. IX = sternum IX; ter. IX = tergum IX; seg. X = segment X; sup. app. = superior appendage (paired); cox. = coxopodite (paired); har. = harpago (paired); pht. = phallotheca; aed. = aedeagus; sub. pro. aed. = subapical projection of aedeagus.