Perlomyia ainu, Sivec & Stark, 2012

Sivec, Ignac & Stark, Bill P., 2012, Seven New Species Of Perlomyia (Plecoptera: Leuctridae) From Japan, Illiesia 8 (7), pp. 94-103 : 95

publication ID	https://doi.org/ 10.5281/zenodo.4760796
DOI	https://doi.org/10.5281/zenodo.4763631
persistent identifier	https://treatment.plazi.org/id/80643417-FFC5-FF8E-FECE-FE43FB7767F4
treatment provided by	Felipe
scientific name	Perlomyia ainu
status	sp. nov.

Treatment

Perlomyia ainu View in CoL sp. n.

( Figs. 1-3 View Figs )

Material examined. Holotype ♂, Japan, Iwate Prefecture, Hienuki River , 16 km above Hayachine Dam, 3 May 2002, C.D. Kerst ( PMSL).

Male. Forewing length 5 mm. General color dark brown to black. Epiproct long and slender, forming a narrow triangular structure in dorsal aspect ( Fig. 1 View Figs ), and shaped like a raptorial beak in lateral aspect ( Fig. 3 View Figs ). Tergum 9 broadly excavated on posterior margin; small knobs absent from tergum 10, but posterolateral margins developed into low wide mounds. Tergum 8 with small, erect median lobe truncate on posterior margin and tergum 6 with a minute posteromedian lobe. Cerci bear a small posteromedian spine in lateral aspect ( Fig. 3 View Figs ). Paraprocts fused into a broad, thick process; lateral aspect of paraprocts wide at base and tapered to form a sagittate structure in ventral aspect ( Fig. 2 View Figs ). Apex of sternum 9 curved strongly dorsad ( Fig. 3 View Figs ); vesicle wide apically and tapered to base ( Fig. 2 View Figs ).

Female. Unknown.

Larva. Unknown.

Etymology. The species name, used as a noun in apposition, honors the early Ainu culture once known from the area of the type locality.

Diagnosis. This species is one of at least four Japanese species without the distinctive pair of small knobs found on P. parva and several other members of the genus ( Kawai 1967; Nelson & Hanson 1973); we are uncertain about the presence of these structures on P. gifuensis . This new species is easily distinguished from other Japanese species by the presence of a truncate lobe on male tergum 8 and by the small apical spine on the male cerci. Perlomyia kersti , described below, is the only other Japanese species known to have a male tergal lobe and in that species the dorsal lobe is located on tergum 9. At least two other Asian Perlomyia , P. levanidovae ( Zhiltzova 1975) and P. smithae Nelson & Hanson 1973 , lack knobs on male tergum 10, but these species also lack dorsal lobes on segment 8.