The Caddisfly Family Phryganeidae (Trichoptera) by Glenn B. Wiggins

Author:Glenn B. Wiggins [Wiggins, Glenn B.]
Language: eng
Format: epub
Publisher: University of Toronto Press
Published: 1998-07-14T16:00:00+00:00

Length of fore wing 17–28 mm. Highly variable in size and in wing proportions. Antennae with broad brown bands; legs uniform greyish-brown with darker bands on distal ends of tibiae and tarsal segments of fore and middle legs, hind legs lighter in colour and more uniform throughout; spines black, tibial spurs light brown. Fore wings with dense setal covering, colour variable but much as in P. grandis; fore wings of males dark brown mottled with variable greyish spots, lighter areas extensive basally; fore wings of females more greyish with dark brown bar along long axis broken in centre and terminating in white spot in cell M2; cells R4 and R5 often with dark brown lines. Hind wings grey, slightly darker apically. Venation (Fig. 129) in general similar to P. grandis, but differing in variable condition of M4 in fore wings of both sexes; in males M3+4 usually undivided in fore wings, but in some specimens M4 occurs as separate vein and in others runs into cula resembling oblique crossvein; in most females M4 separate in fore wings, usually as oblique crossvein joining cula, but sometimes as separate vein; in both sexes M4 may be separate in one fore wing, yet fused with M3 in the other in same individual; hind wings with M3+4 undivided in those cases where M3 and M4 separate in fore wings.

Male genitalia (Fig. 127). Segment IX broad mid-laterally; inferior appendages short, terminal segment lacking; posteroventral edge upturned and bearing large teeth; mesal surface concave with series of transverse dentate ridges. Segment X with pair of short dorsal, triangular lobes (preanal appendages?) arising from base of stout paired processes bearing many short, denticlelike setae. Phallotheca with apex produced ventrally as pair of sclerotized, marginally dentate lobes; invaginated endotheca with pair of long spines and several short spines.

Female genitalia (Fig. 128). Subgenital plate divided apically into three stout vulval lobes, in lateral view lateral lobes not as deeply excavate dorsally as in P. sayi; median lobe flat, tapered little towards apex, bearing deep v-shaped apical notch; lateral shoulders of subgenital plate smoothly rounded and without sharp angle of P. sayi.

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