Agnetina vietnamica Li &Wang

Li, Weihai & Wang, Guoquan, 2012, A synopsis of Agnetina (Plecoptera: Perlidae) from Vietnam, Zootaxa 3526, pp. 84-88 : 84-87

Agnetina vietnamica Li &Wang , sp. nov.

( Figs. 1 –10)

Male: Triocellate. General color dark brown with most of the ventral surface yellowish brown. Forewing length ca. 13.0 mm, hind wing length ca. 11.8 mm. Head ( Figs. 1–2 ) dark brown in both dorsal and ventral view, compound eyes dark; antennae ca. 9 mm, scape proximal part brown, remainder brownish yellow, basal 1/4 brownish yellow, gradually getting brown to dark brown; mouthparts brown. Thorax brown, ventral surface yellow; pronotum with brown hexagonal disk surrounded by yellow margins, surface with vague markings and rugosities, posterior corners with sloping depression; legs mostly dark brown, coxae and trochanters yellow; femora banded, forelegs with proximal 2/5 yellow and middle and hind legs with proximal ca. ½ yellow ( Fig. 4 ). Wings subhyaline, veins dark brown, apical portion brown ( Fig. 3 ). Abdomen brownish; cerci dark except the first segment lightly pigmented. Tergum 5 with a pair of reduced transverse lobe-like areas covered by many long hairs. Tergum 6 unmodified. Tergum 7 with a small upraised posteromedian lobe (Fig. 7). Tergum 9 ( Figs. 5–6 & 7–9) with broad anteromedian sclerite, covered by two pairs of spines. Sterna 5–7 with hair brushes with that of sternum 6 more prominent. Hemitergites long and directed upwarded, with sparse sensilla basiconica along anterolateral margins; medially with a proximal triangular lower lobe; its apex rounded and curved outward, forming a blunt angle. Aedeagus nearly spherical and curved ventrad, covered almost uniformly by tiny granules and spines.

Female: Unknown.

Type Material. Holotype: male, Vietnam: Cao Bang Province, 20 km SW of Cao Bang City, Hoaan, Deo Cao Bac, 240 m, 22.3526 N, 106.0992 E, 22.V.2012, light trap, G.Q. Wang.

Distribution. Northern Vietnam (Cao Bang).

Etymology. The species epithet refers to the country where it was collected.

Figures 7–10. Agnetina vietnamica sp. nov. (male). 7. Terminalia, dorsal view. 8. Hemitergite, dorsal view. 9. Hemitergite, lateral view.10. Aedeagus, lateral view.

Diagnosis and Remarks. the new species seems related to A. jarai and A. den , due to the reduced lobe of tergum 5, absence of lobes of tergum 6 and long hemitergites. The main differences exist in the shape and characteristics of T5 lobe and hemitergites. In A. jarai and A. den , the T5 lobes are covered by sensilla basiconica; the hemitergites have narrowing apices and are not curved outward at the apices as in the new species. The new species is unusual in having the lobes of T5 covered by many long hairs, and hemitergites having a rounded and upturned apex with a triangular lower lobe. We provide a key for males of the three species to facilitate their identification.

Figures

FIGURES 1 – 6. Agnetina vietnamica sp. nov. (male). 1. Head and pronotum, dorsal view. 2. Head, ventral view. 3. Forewing tip, dorsal view. 4. Leg pattern, ventral view. 5. Hemitergite, dorsal view. 6. Hemitergite, lateral view.