Neoperla sp.

Stark, Bill P. & Sivec, Ignac, 2015, New Species And Records Of Neoperla (Plecoptera: Perlidae) From India, Illiesia 11 (7), pp. 75-91 : 88

Neoperla sp. Id-C

( Figs. 28-30 , 33-36 )

Material examined. INDIA: Karnataka, Agumbe Ghats , 13° 29.386’N, 75° 04.537’E, 9 October 2004, G. Svenson, light trap, 1♀ ( BYUC) . Jog Falls , canopy sample #2, 14° 16.503’N, 74° 44.5221’E, 7 October 2004, G. Svenson, 1♀ ( BYUC) .

Adult habitus. General color pale yellow-brown, patterned with darker brown. Ocellar area with a small dark spot between ocelli and extending forward as a small projection; frontoclypeal region with an obscure, bird-shaped dusky area; lappets dusky, basal two antennal segments brown, flagellum black ( Fig. 28 ).Wing membrane transparent, veins brown except for pale white or whitish brown C and Sc. Hind femora pale in basal 2/3, becoming slightly darker in distal third; tibiae brown but darker on outer margin at knee.

Male. Unknown.

Female. Forewing length 12 mm. Subgenital plate scarcely developed ( Fig. 30 ), but mesal margin protruding slightly and almost hairless. Vagina membranous, elongate, narrow and with subparallel lateral margins; seminal receptacle duct coiled dorsally above vagina, forming an almost complete ring around membranous, coiled receptacle; receptacle duct densely lined with brown scales for most of duct length ( Fig. 29 ).

Egg. Barrel-shaped with broad lid and small collar base with narrow orifice ( Fig. 33 ). Length ca. 317 μm, greatest subequatorial width ca. 145 μm. Collar scarcely stalked, basal collar width ca. 122 μm, orifice width ca. 32 μm; rim narrow, smooth and unflanged; base with ca. 3-4 irregular rows of large depressions on sides of collar ( Fig. 34 ). Striae broad, smooth, with a slight sinistral curve and separated by narrow sulci; width of striae ca. 15-17 μm. Lid separated from egg body by smooth eclosion line; lid short in lateral aspect ( Fig. 36 ), apical diameter ca. 145 μm ( Fig. 35 ); follicle cell impressions distinct on lid adjacent to eclosion line, but obscure nearer apex; floors of follicle cell impressions without distinct punctations (although their presence is not ruled out due to membrane on lid). Micropyles with simple orifices and without sperm guides; openings set in sulci on equatorial side of eclosion line ( Fig. 36 ).

Larva. Unknown.

Comments. The egg of this species is another of those apparently not included in the sample available to Zwick (1981). It is generally similar to the egg of N. nebulosa Stark & Sivec, 2008b , a Vietnamese species, but the striae are relatively straight in that species and the collar of N. nebulosa differs from the egg of this species. Among species known from South India, the egg collar is similar to that of N. obscura , but in that species the striae are narrow, sulci are wide and densely punctate, the lid is distinctly narrowed apically and bears conspicuous follicle cell impressions ( Zwick 1981).

Figures

Figs. 28-32. Neoperla adult structures. 28-30. Neoperla sp. Id-C. 28. Head and pronotum. 29. Vagina and receptacle. 30. Subgenital plate. 31-32. Neoperla sp. Id-D. 31. Head and pronotum. 32. Vagina and receptacle.

Figs. 33-36. Neoperla sp. Id-C eggs. 33. Entire egg, lateral. 34. Collar end. 35. Lid, apical aspect. 36. Lid and eclosion line.