Indonemoura angulata, Sivec & Stark, 2010

Sivec, Ignac & Stark, Bill P., 2010, Eleven New Species Of The Genus Indonemoura Baumann (Plecoptera: Nemouridae) From Thailand And Vietnam, Illiesia 6 (14), pp. 210-226 : 211-212

Indonemoura angulata sp. n.

( Figs. 1-5 )

Material examined. Holotype ♂ and 1♂, 3♀ paratypes from Vietnam, Vinh Phu Province , Tam Dao, 800-1000 m, 19 May-13 June 1995, H. Malicky ( PMSL).

Male. Forewing length 7 mm. Epiproct long with slight constriction near midlength, slightly wider subapically and narrowed to an acute point in dorsal aspect ( Fig. 1 ); ventrolateral aspect wider subapically and bearing a few small spines ( Fig. 2 ). Outer and mesal paraproct lobes slender, subequal in length and both bent sharply near apex ( Figs. 3-4 ); inner lobe short and somewhat club shaped. Tergum 9 and 10 without conspicuous sensilla patches. Vesicle short and slightly widened subapically ( Fig. 3 ); hypoproct slender, and tapering to a slightly rounded or acute apex.

Female. Forewing length 9.5 mm. Subgenital plate broadly notched on posterior margin ( Fig. 5 ). Posterior margin of sternum 7 not projecting over base of sternum 8.

Larva. Unknown.

Etymology. The species name refers to the angular, subapical bend in the paraproct lobes.

Diagnosis. Five of the regional species share the presence of a pair of small tubercles located adjacent to the epiproct on tergum 10. This feature apparently does not occur on most other species of Indonemoura , or at least it is not shown in figures provided by colleagues, except for I. trichotoma Li & Yang ( Li & Yang 2008c). The regional species included in this grouping, I. angulata , I. auberti , I. bilobata , I. horvati and I. rostrilobata , are distinguished in the key and I. trichotoma differs from these species in having a group of small spines on the hypoproct ( Li & Yang 2008c); I. angulata is similar to I. auberti in lacking sensilla basiconica on tergum 9, but these species have very different paraprocts (compare Figs. 4 and 9 ) and epiprocts (compare Figs. 1 and 6 ).

Figures

Figs. 1-5. Indonemoura angulata. 1. Male terminalia, dorsal aspect. 2. Male terminalia, lateral aspect. 3. Male terminalia, ventral aspect. 4. Male paraprocts, caudal aspect. 5. Female terminalia, ventral aspect.

Figs. 6-10. Indonemoura auberti. 6. Male terminalia, dorsal aspect. 7. Male terminalia, lateral aspect. 8. Male terminalia, ventral aspect. 9. Male paraprocts, caudal aspect. 10. Putative female, ventral aspect.