63.063 Scoparia basistrigalis 1334a
ws: 20-23mm; Jul; mosses?; common in deciduous woodland in England
Scoparia basistrigalis §3 female; Strumpshaw Fen, Norfolk; 07/07/2013 © Chris Lewis
ID: Similar to S.ambigualis but S.basistrigalis is a little larger (ws20-23mm), broader winged with a blunter apex, greyer, without ochreous hue, more heavily irrorate blackish and with a more chequered fringe. Genital dissection readily separates these species - see Scopariinae for comparative images.
Male genitalia: uncus tapered to a narrow point and not exceeded by gnathos (basistrigalis) vs uncus triangular and gnathos exceeds it (ambigualis)
aedeagus with 2 rows of about 4 cornuti each (basistrigalis) vs 2-3 strong cornuti (ambigualis)
Female genitalia: ductud bursae bulbed (basistrigalis) vs not bulbed (ambigualis).
Male genitalia: uncus tapered to a narrow point and not exceeded by gnathos (basistrigalis) vs uncus triangular and gnathos exceeds it (ambigualis)
aedeagus with 2 rows of about 4 cornuti each (basistrigalis) vs 2-3 strong cornuti (ambigualis)
Female genitalia: ductud bursae bulbed (basistrigalis) vs not bulbed (ambigualis).
Page published 10/02/2012 | §3 added 10/04/2014