Sinacroneuria biocellata, Stark & Sivec, 2008

Stark, Bill P. & Sivec, Ignac, 2008, Studies On Sinacroneuria Yang & Yang (Plecoptera: Perlidae) With Description Of New Species From China And Vietnam, Illiesia 4 (15), pp. 150-153 : 150-152

publication ID	https://doi.org/ 10.5281/zenodo.4754757
DOI	https://doi.org/10.5281/zenodo.4764784
persistent identifier	https://treatment.plazi.org/id/03EE87ED-C074-FFF0-F1B3-EE29F335CC09
treatment provided by	Felipe
scientific name	Sinacroneuria biocellata
status	sp. nov.

Treatment

Sinacroneuria biocellata View in CoL n. sp.

( Figs. 1-4 View Figs )

Material studied. Holotype ♂ from Vietnam, Lao Cai, Sapa, large waterfall on Sapa to Lai Chau road, UV light, 8 May 1995, D. Currie, B. Hubley, J. Swann, ROM 956022 View Materials ( ROM)

Adult habitus. Biocellate. Head with large dark brown area covering ocelli and extending to M-line ( Fig. 1 View Figs ); lappets and saggitate mark forward of M-line pale brown. Pronotum pale brown with scattered obscure rugosities on disk; margins and median suture dark brown. Wing membrane transparent, veins pale brown. Femora pale but slightly darker along dorsal edge; tibiae brown. Segments on basal half of antennal flagellum dark brown but apical segments pale.

1 3

Male. Forewing length 16.5 mm. Tergum 9 with sparse mesal patch of sensilla basiconica narrowly divided along midline; tergum 10 with sensilla basiconica patches widely separated and tergum almost divided by membrane ( Fig. 2 View Figs ). Paraproct tips small, acute and darkly sclerotized. Cerci short, consisting of about 14 segments. Hammer present on sternum 9. Y-stem of aedeagal sclerite short ( Fig. 3 View Figs ); arms wide basally and about 2.5 times long as stem; ventral surface of aedeagus armed with a slender, median sclerite, sparsely covered with small spines ( Fig. 4 View Figs ).

Female. Unknown.

Larva. Unknown.

Etymology. The species name refers to the presence of only two ocelli on this species.

Diagnosis. Sinacroneuria biocellata adults are distinguished from those of congeners by the presence of only two ocelli. Males appear to have more widely separated sensilla patches on tergum 10 and those on tergum 9 are less abundant and form a more-or-less united patch. Additionally the aedeagal sclerite Y-stem is relatively shorter than is shown by Yang & Yang (1995) for S. orientalis . Yang & Yang (1995) also show the 10 th tergum of the male to be completely divided by membrane, and this species has the membrane strip incomplete.