Cheumatopsyche howensis, Wells, Alice, 2011

Wells, Alice, 2011, The Trichoptera of Lord Howe Island, including 3 new species, larvae and keys, Zootaxa 2987, pp. 45-55 : 47-49

Cheumatopsyche howensis sp. nov.

( Figs 5–8, 13 )

Material examined. Holotype male, Soldiers Creek, 22.xi.1996, A. Wells & L.A. Mound, lt tr.

Paratypes: 1 male, 4 females, Soldiers Creek, 23–24.xi.1996, A. Wells & L.A. Mound, lt tr.

Diagnosis. Males of this species are distinguished from those of C. erskinensis by the sharper, apically acuminate segment of each gonopod and in having the apical margin of abdominal segment X concave in dorsal view. The apico-lateral angles of abdominal segment IX in lateral view are more broadly rounded in comparison with those of C. erskinensis . In the female, the apico-lateral angles of sternite VIII are produced and somewhat triangular whereas in C. erskinensis they are rounded. This species more closely resembles C. modica ( McLachlan, 1871) , but differs in lacking the basal spur on the terminal segment of the gonopods; females taken with this species have the apico-dorsal angle of abdominal sternite VIII produced, and more sharply than C. modica ( Fig. 13 ).

Wings ( Fig. 5). Forewing length: male 6.1–6.8 mm (n =2); female 7.5–9.0 (n =4).

Male genitalia ( Figs 6–8). Tergite IX in dorsal view broad distally, apico-medially forming pair of broadly rounded, clearly discrete setate lobes; in lateral view broadly triangular. Tergite X in dorsal view bearing pair of small wart-like, setate lobes laterally and pair of apically truncate processes apico-laterally; in lateral view sharply pointed apically, with small setose wart dorsally. Phallic apparatus narrowest in middle region, clearly divided apically. Gonopods in ventral view slender, each angled mesally in distal 3rd, apical process tapered to narrowly rounded apex; in lateral view slender, curved ventrad.

Female genitalia ( Fig. 13 ): sternite VIII generally pale; apico-dorsal angle produced, triangular, and darkly pigmented.

Etymology. Named for Lord Howe Island.

Figures

FIGURE 13. Cheumatopsyche howensis sp. n., female terminalia, left lateral view. FIGURES 14 – 16. Cheumatopsyche ' light form' larva: frontoclypeus, posterior apex of frontoclypeus, ventral sclerites of prothorax, respectively.