Hemisyntexis Li, Wang, Rasnitsyn & Shih, 2024

Genus Hemisyntexis Li, Wang, Rasnitsyn & Shih , gen. nov.

urn:lsid:zoobank.org:act:DF01EA9F-051E-4115-8BB2-3B749CE51B9F

Type Species. Hemisyntexis lepida Li, Wang, Rasnitsyn & Shih , sp. nov.

Etymology. The generic name is a combination of Greek “ Hemi- ”, meaning half and referring to the pterostigma without sclerotized part basally, and the generic name Syntexis .

Diagnosis. Mesonotum with scuto-scutellar sulci 1.5 times as long as notauli. Forewing with costal area narrow uniformly; pterostigma wedge, desclerotized basally, the rest part completely sclerotized, 0.6 times as long as 2r-rs; Sc absent; 2r-rs issuing from pterostigma at its mid-length; cell 2r darkened; 1-Rs proclival, twice as long as 1-M; 2-Rs front of 1m-cu, 2-M less than half 2-Rs length; 5-M (section between 3r-m and wing margin) as long as 2m-cu; cell 3r 1.3 times as long as cells 1r and 2r together; cell 1mcu hexagonal.

Remarks. The new genus is unique within Syntexinae in having pterostigma not sclerotized basally. It belongs to the basal group of genera which retain 1r-rs and long and proclival 1-Rs. This group also includes Syntexis Rohwer, 1915 , Dolichosyntexis Kopylov, 2019 , Daosyntexis Kopylov, 2020 , Parasyntexis Kopylov, 2020 and Hanguksyntexis Rosse-Guillevic et al., 2023. Within this group, Hemisyntexis is additionally unique in having pterostigma not reaching the middle 3r cell (vs., pterostigma reaching the middle 3r cell in Dolichosyntexis ) and narrow (at 2r-rs, much narrower than length of 2r-rs, vs. at most as wide there as 2r-rs long).