Helicopsyche dorsocurvata, Johanson, Kjell Arne & Holzenthal, Ralph W., 2010

Johanson, Kjell Arne & Holzenthal, Ralph W., 2010, The snail-case caddisfly subgenus Helicopsyche (Feropsyche) in Costa Rica, with the description of 3 new species (Trichoptera: Helicopsychidae), Zootaxa 2689, pp. 37-47 : 41-42

Helicopsyche dorsocurvata , new species

Fig. 15–21 , 22

Helicopsyche dorsocurvata is most similar to H. disjuncta Johanson & Holzenthal, 2004, from which it is separated by having tergum X with a deep, narrow apical notch instead of a very wide, rectangular notch.

Forewing length 4.3 mm; hind wing length 3.5 mm.

Male abdomen and genitalia ( Fig. 15–21 ). Sternal process VI long, straight, thick, oriented posterad; nearly parallel-sided in lateral view ( Fig. 15 ); narrowest at mid-length in ventral view ( Fig. 16 ). Anterior lobe of segment IX ( Fig. 17 ) widely ellipsoid in lateral view, oriented anterad from below midheight of segment IX; anterodorsal margin nearly straight; anteroventral margin shallowly concave; ventral margin short, straight ( Fig. 17 ); in dorsal view, inner margin forming semi-circular cavity ( Fig. 18 ); in ventral view, with wide, shallow central posterior process ( Fig. 19 ); lateral apodeme horizontal, curving ventrad towards welldeveloped sub-marginal line ( Fig. 17 ); tergal transverse apodemes short, weak; sternal transverse apodemes running along posterior margin of segment IX. Tergum X, in lateral view, curving dorsad ( Fig. 17 ), apex pointed; tapering along its length ( Fig. 17 ); in dorsal view ( Fig. 18 ) basally narrow, widening at mid-length before narrowing towards apex; apex deeply notched; about 8 pairs of equally long megasetae present laterally in longitudinal group starting distally of mid-length of segment; most megasetae confined to apex. Superior appendages club-shaped ( Fig. 17 ). Primary branch of gonopods, in lateral view ( Fig. 17 ), widening distally; dorsal margin with undulating margin; apex long, narrowing posterally; anterodorsal margin irregular; posteroventral margin smooth, nearly straight, without marginal processes. Basomesal lobes short in lateral view ( Fig. 17 ); in ventral view oriented posteromesad; each lobe with rounded apex covered by small megasetae; mesal margins strongly concave ( Fig. 19 ). Basal plate, in lateral view ( Fig. 17 ) curving ventrad, thick; anterior part narrower than posterior part; in ventral view, narrowly triangular ( Fig. 19 ). Phallic apparatus, in lateral view, widest anteriorly ( Fig. 20 ), narrowest at mid-length; distally slightly widening; slightly curving ventrad along its length; in ventral view, with basis narrow; ( Fig. 21 ) slightly wider proximally, narrowest at mid-length, strongly wider distally; endotheca not produced, posteroventral part well sclerotized; anterior part of sperm channel slender, widening inside phallus at 1/3rd phallic length.

Male holotype. COSTA RICA: Cartago, Reserva Tapanti, Quebrada Palmitos and falls, 1400 m, 9.72°N, 83.78°W [Holzenthal, Blahnik & Muñoz] (UMSP000100631) (UMSP, alcohol). Distribution. Costa Rica (Cartago) ( Fig. 22).

Etymology. Dorsocurvata , named after the dorsally curving tergum X.

Figures

FIGURES 15 – 21. Helicopsyche dorsocurvata, new species, holotype. 15 — sternum VI, lateral; 16 — sternum VI process, ventral; 17 — genitalia, lateral; 18 — genitalia, dorsal; 19 — genitalia, ventral; 20 — phallic apparatus, lateral; 21 — phallic apparatus, ventral. Scale bar (0.1 mm) refers to all figures.