Phanoperla namcattien Cao & Bae

Cao, Thi Kim Thu & Bae, Yeon Jae, 2009, Phanoperla namcattien, a new stonefly from Vietnam (Plecoptera: Perlidae), Zootaxa 1983, pp. 66-68: 66-68

publication ID 10.5281/zenodo.185366

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scientific name

Phanoperla namcattien Cao & Bae

sp. nov.

Phanoperla namcattien Cao & Bae   , sp. nov.

( Figs. 1–8 View FIGURES 1 – 8 )

Diagnosis. The male adult of P. namcattien   is characterized by the presence of narrow, finger-like anterior processes of the hemiterga ( Figs. 4, 5 View FIGURES 1 – 8 ), by the presence of three patches of sensilla basiconica on the anterior edge of the 9 th abdominal tergum ( Figs. 4, 5 View FIGURES 1 – 8 ), and by the shape of the aedeagus that possesses a complete ring of short spinules on the conical end and fields of long, sharp spinules on the subapical, lateral surfaces ( Figs. 6–8 View FIGURES 1 – 8 ). The female adult is characterized by the unproduced subgenital plate, relatively long vagina, balloon-like spermatheca, and relatively long and slender spermathecal stalk ( Figs. 2, 3 View FIGURES 1 – 8 ).

Male. Body length 7.2 mm; forewings 7.0 mm; hindwings 6.3 mm. General body color yellowish brown. Head ( Fig. 1 View FIGURES 1 – 8 ) yellowish brown, as wide as pronotum (head width: 1.3 mm), without distinct marking. Ocelli two, normal in size; ocellar rings black; distance between ocelli ca. 0.5 x distance from ocellus to inner margin of compound eye. Pronotum ( Fig. 1 View FIGURES 1 – 8 ) ca. 2.0 x wider than long, with irregular brownish rugosities; corners round. Wing membrane clear; Rs with simple fork. Abdominal sterna V –VII with setal brushes medially; brushes more pronounced on sternum VII. Abdominal tergum IX ( Figs. 4, 5 View FIGURES 1 – 8 ) depressed medially, with two submedian and one median patches of sensilla basiconica. Hemiterga simple, modified from abdominal tergum X; each hemitergum weakly sclerotized; anterior process finger-like, slender, moderately curved outward; proximal part with several sensilla basiconica. Aedeagus tube ( Figs. 6–8 View FIGURES 1 – 8 ) slender, membranous, ca. 0.5 mm long; everted sac ( Figs. 6, 7 View FIGURES 1 – 8 ) curved ventrally, with a complete ring of short spinules on conical end, with fields of long, sharp spinules on subapical, lateral surfaces; everted sac of aedeagus in dorsal view ( Fig. 8 View FIGURES 1 – 8 ) with large rhomboid dark brown sclerite, with fields of minute spinules laterally.

Female. Body length 7.5 mm; forewings 8.0 mm; hindwings 7.0 mm. General body color pale brown; general body shape and color similar to male but somewhat larger than male. Subgenital plate on abdominal sternum VIII ( Fig. 2 View FIGURES 1 – 8 ) unproduced. Vagina ( Fig. 3 View FIGURES 1 – 8 ) membranous, longer than wide, without distinct marking. Spermatheca balloon-like; spermathecal stalk relatively long and slender.

Nymph. Unknown.

Type material. Holotype: Male adult (SWU –PLE – 187), Nam Cat Tien National Park, Dong Nai Province, southern Vietnam, 7.viii. 2005, Thi Kim Thu Cao [SWU –AIC]. Paratypes: 8 male adults & 2 female adults (SWU –PLE – 183), same data as holotype.

Etymology. The specific epithet, namcattien   (noun), is based on the type locality (Nam Cat Tien National Park) of this species.

Remarks. The general aedeagus shape of P. namcattien   resembles that of P. m a l a y a n a Zwick (in Zwick 1982), but the armature on the aedeagus of these two species is distinguishable as demonstrated in the key, below. The long, slender, terminally-curved aedeagus tube is a common characteristic of the pallipennis -group ( Zwick 1982). The examined females contained no eggs.

Distribution. Southern Vietnam.