Neoperla sp.

Stark, Bill P. & Sivec, Ignac, 2015, New Species And Records Of Neoperla (Plecoptera: Perlidae) From India, Illiesia 11 (7), pp. 75-91 : 83-85

Neoperla sp. Id-A

( Figs. 15-16 , 20-23 )

Material examined. INDIA: Karnataka, Agumbe Ghats , 13° 29.452’N, 75° 04.221’E, 7 October 2004, G. Svenson, 1♀ ( BYUC). Same site, 9 October 2004, Svenson, Cameron, Miller, 1♀ ( BYUC). Same site, 9 October 2004, G. Svenson, 3♀ ( BYUC) .

Adult habitus. General color yellow brown with darker markings on head and pronotum. Head with a small dark spot between ocelli, attenuated on anterior margin forming a sharp point. A pair of small, dark, oval spots occur anterolateral of ocelli and a larger median dark spot occurs on the frontoclypeus. Lappets dark brown, antennal bases pale brown ( Fig. 15 ). Wing membrane transparent, veins pale brown except C and Sc pale. Legs missing, cerci and antennae broken.

Male. Unknown.

Female. Forewing length 10.5 mm. Subgenital plate undeveloped. Vagina membranous, without apparent internal structures; lateral margins constricted near mid-length ( Fig. 16 ). Receptacular duct coiled into an almost complete O-shaped ring; duct contains brown scales in an almost complete internal coating, but with slightly more unscaled area near apex. Seminal receptacle membranous, sausage shaped and coiled into space within coils of duct.

Egg. Outline flask-shaped with narrow collar and expanded lid ( Figs. 20-21 ). Length ca. 333-346 μm, equatorial width ca. 212 μm. Collar short, height ca. 38 μm, slightly offset from egg body at base and tapered from basal width of ca. 79 μm; sides of collar with lateral ornamentation consisting of about 6 hexagonal units. Anchor a globular mass covered sparsely with globular bodies and with a few marginal projections ( Fig. 21 ). Body of egg with ca. 5 striae in lateral profile separated by wide, finely punctate sulci; striae bearing a narrow, smooth, thread-like longitudinal line along ridge ( Fig. 23 ). Micropyles set on low mounds in sulci near eclosion line; eclosion line rather densely punctate, width ca. 15 μm. Lid outline somewhat triangular in lateral aspect ( Fig. 22 ), surface with faint follicle cell impressions and very fine punctations.

Larva. Unknown.

Comments. Zwick (1981) described the egg for four of the eight species known at that time from South India. The egg of this species does not appear to match any of those, but is similar in general shape to that of Neoperla sp. B in Stark (1983) from Thailand. The surface detail, however, is quite distinctive for this species, consequently, these females may represent one of the Indian species known only from the male stage, or they may represent an undescribed species.

Figures

Figs. 15-19. Neoperla adult structures. 15-16. Neoperla sp. Id-A. 15. Head and pronotum. 16. Vagina and receptacle. 17-19. Neoperla sp. Id-B. 17. Head and pronotum. 18. Vagina and receptacle. 19. Subgenital plate.

Figs. 20-23. Neoperla sp. Id-A eggs. 20. Entire egg, lateral. 21. Collar end with anchor. 22. Lid and eclosion line. 23. Median field.