Osmylus hyalinatus, McLachlan, 1875

Li, Zechuan, Zheng, Yuchen, Wang, Yongjie & Liu, Xingyue, 2025, A revision of the Osmylus hyalinatus species group (Neuroptera: Osmylidae), with description of seven new species, Journal of Natural History 59 (13 - 16), pp. 849-893 : 854

The Osmylus hyalinatus species group

Included species

Osmylus atomatus ( Yang, 1988) , O. decoratus Nakahara, 1914 , O. flaviantennatus Li, Zheng, Wang and Liu sp. n., O. gaoligongensis Zheng,Li, Wang and Liu sp. n., O. hyalinatus McLachlan, 1875 , O. qinlinganus Li, Zheng, Wang and Liu sp. n., O. trituberatus Li, Zheng, Wang and Liu sp. n., O. verticalis Li, Zheng, Wang and Liu sp. n., O. wenii Zheng, Li, Wang and Liu sp. n., O. xiaohongae Zheng, Li, Wang and Liu sp. n., and O. zheanus ( Yang and Liu, 2001) .

Diagnosis

Fore wing broad, elongate;hyaline,without irregularly shaped brown marking;in most species dark brown dots present at distal area of MA and CuP,outer gradate series and fore wing apex; in some species fore wing inner margin with regular marking (ie O. decoratus ); pterostigma pale, yellow to brown; subcostal veinlets often forked near costal margin, connected by numerous short oblique crossveins. Hind wing similar to fore wing. Male tergum 9 with a triangular dorsal process; gonocoxites 9 with two pairs of tubercles, usually subtriangular or digitiform in lateral view.

Distribution

China, Japan, Russia (Kuanshir Island).

Remarks

This species group can be easily distinguished from the other species of Osmylus by the spotless fore wing, the costal interlinked crossveins, and the male genitalia. In the other species of Osmylus , the fore wing has mottled marking, scattered irregularly around RP area, Cu area, and inner margin. Nevertheless, variation of marking pattern is present within the species of the O. hyalinatus group, eg O. decoratus sometimes with markings on fore wing RP area. In other species the number of dots varies among conspecific individuals. The fore wing subcostal veinlets of species in this group are basally connected by some short oblique crossveins, which are absent in other species of the genus. The process of the male tergum 9 of the species in this group are long (eg O. atomatus ) or short triangular (eg O. decoratus ), whereas the process of the male tergum 9 of the other species in the genus are different and variously shaped, being long subulate (eg O. bipapillatus ), stoutly digitiform (eg O. pachycaudatus ) or even absent (eg O. fuberosus ).