ws |
fw |
flight |
time |
10.5-14 |
4.9-6.7 (20) |
Jul-Aug |
night & to light |
lfp |
habitat |
distribution |
status |
elm (Ulmus spp) birch (Betula spp) alder (Alnus) hazel (Corylus avellana) |
various |
GB |
common |
ID: Group C - plain
Genital dissection required to distinguish from other species in Group C
Genital dissection required to distinguish from other species in Group C
Male genitalia
Vinculum with a V-shaped saccus that forms a sac over (ventral to) the sacculi; side arms turn dorsally, their posterodorsal ends without a sclerotised connection. Tegumen tubular with a ~quadrate dorsal plate and fairly broad sidearms that articulate with the costa. Gnathos with short sidearms and a broad ovoid median lobe. Sacculus small, triangular; AVM shallowly concave; ALA produced and dentate; LM concave; PLA acute. Valvula elongate with a rounded apex; interposed between sacculus and costa; extending ~2x as far laterally as sacculus. Costa a short sclerotised bar connecting valvula and tegumen, somewhat expanded at articulation with tegumen. Transtilla projects anteriorly from base of costa, not meeting in midline. Juxta an elongate fold connecting anterior end of sacculi/dorsal surface of saccus to the ventral surface of the base of the tunica. Tunica simple, sclerotisation tapers to become confined to ventral surface in apical ½. Vesica very short with a single cornutus at junction of vesica and tunica; annulus very diffuse. Male genital key: Sacculus small and triangular with a distinct anterolateral projection, a small posterolateral projection and a concave lateral margin.
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Female genitalia
Anal papillae elongate, domed. Posterior apophyses ~2½xOP. Dorsal plate of A8 not sclerotised. Anterior apophyses 1½xOP, somewhat curved in posterior ⅔ and kinked near apex. OP quadrate. Angles of PM slightly produced and hairy. Ostium at PM. Antrum sclerotised to just anterior to AM. DB with sparse circumferential spiculation in mid section for ~2xOP. BC ovoid contains a thorn signum with a narrow base-plate.
Anal papillae elongate, domed. Posterior apophyses ~2½xOP. Dorsal plate of A8 not sclerotised. Anterior apophyses 1½xOP, somewhat curved in posterior ⅔ and kinked near apex. OP quadrate. Angles of PM slightly produced and hairy. Ostium at PM. Antrum sclerotised to just anterior to AM. DB with sparse circumferential spiculation in mid section for ~2xOP. BC ovoid contains a thorn signum with a narrow base-plate.
Female genital key: Ductus bursae without a heavily spiculate section in its posterior ⅓; with an area of spiculation at a coil halfway along its length; antrum more heavily sclerotised than ostial plate