Helicopsyche (Feropsyche) carajas, 2019

Neto, Jaime De Liege Gama, Ribeiro, José Moacir Ferreira & Passos, Mahedy Araujo Bastos, 2019, Two new species of Helicopsyche Siebold 1856 (Insecta: Trichoptera: Helicopsychidae) from Pará State, northern Brazil, Zootaxa 4565 (3), pp. 420-426 : 422-423

Helicopsyche (Feropsyche) carajas sp. nov.

Figs. 2 A–2G.

Diagnosis. The male of H. carajas n. sp. is similar to those of H. haitiensis Banks 1938 and H. limnella Ross 1938 , resembling each other mainly in the lateral view of the primary branch of each gonocoxite, with its posterior apex directed slightly ventrad, slender, and strongly pointed, and in the well-developed lateral lobes of the endotheca. In all three of these species, each gonocoxite has almost the same width basally and at midlength. However, in H. haitiensis the dorsal margin of each gonocoxite is conspicuously concave in lateral view, but nearly straight in the other two species; in H. haitensis and H. limnella , each gonocoxite has a relatively smooth inner margin in ventral view while in the new species the inner margin of each gonocoxite has prominent setal chalazae about midlength; in H. limnella the gonocoxite as a whole is broader than that of the new species. In the new species the dorsal lobes of the endotheca are posteriorly protruding (but rounded in H. haitiensis and small in H. limnella ;) and the phallotremal sclerite (= phallic sclerite of Johanson 2002) in ventral view it is bean-shaped and about midlength in endotheca (positioned anteriorly of the endotheca in H. haitiensis and circular in H. limnella ). Additionally, segment X of the new species has 8 pairs of subequal megasetae distributed in 2 longitudinal rows distally (but in H. haitiensis it has about 23 short, stout megasetae in each of 2 irregular longitudinal rows starting laterally on anterior margin of tergite IX; and in H. limnella it has about 12 megasetae in each of 2 irregular longitudinal rows starting midway plus about 5 smaller megasetae in a transverse group at the apex).

Description. Adult male. Head with cephalic warts oval and flat. Postantennal setal warts bean-shaped, almost as wide as scape. Antennal scape as long as eye diameter. Forewings brownish, each 3.5 mm long (holotype). Hind wings each 2.5 mm long (holotype), with 22 hamuli on basal half of Costa; anal border with fringe of long setae, as long as hind wing width ( Fig. 2A ). Apicomesal process of abdominal sternum VI about half as long as its segment, straight in lateral view, tubular, oriented posteroventrad, and apically rounded ( Fig. 2B ).

Male genitalia. Segment IX, in lateral view, with anterior lobe on each side narrowly ellipsoid, oriented anteromesad; anterodorsal margin slightly convex; lateral apodeme on each side curved slightly dorsad posteriorly; tergal transverse apodeme absent ( Fig. 2C ); in ventral view rectangular, anterior margin recessed, straight, without posterior process; sternal transverse apodeme present on each side ( Figs. 2C, 2D ); in dorsal view with anterior margin deeply concave ( Fig. 2E ). Segment X directed posterad, in lateral view, dorsal margin nearly straight, apex truncate, ventral margin straight ( Fig. 2C ); in dorsal view, oblong, apex very shallowly notched, with 8 pairs of subequal megasetae in longitudinal rows near apex ( Fig. 2E ). Superior appendages clavate, oriented lateroposterad ( Figs. 2C, 2E ). Gonocoxites each having primary branch, in lateral view, with basal half nearly as broad as median part and parallel-sided, posterior apex tapered and slender, curved slightly ventrad and strongly pointed, posterior margin unpigmented ( Fig. 2C ); in ventral view without incision between primary branch and basomesal lobe ( Fig. 2D ); in dorsal and ventral views elongate and strongly tapering apically, inner margin with 4 setal chalazae about midlength, external margin smooth ( Figs. 2D, 2E ); basomesal lobe, in lateral view, protruding beyond primary branch, with 7–9 apical megasetae ( Fig. 2C ); in ventral view, subrectangular ( Fig. 2D ). Basal plate, in ventral view, anteriorly tapered, with apex narrowly rounded ( Fig. 2D ). Phallus, in lateral view, evenly bent ventrad at midlength, phallic shield ( Morse 1975) evident at base in lateral and ventral views ( Figs. 2F, 2G ); endotheca, lateral view, with protruding dorsal and ventral lobes posteriorly ( Fig. 2F ), in ventral view with lateral lobes prominent; sperm channel inflated basally ( Figs. 2F, 2G ); phallotremal sclerite ( Nielsen 1957) conspicuous, beanshaped ( Figs. 2F, 2G ).

Female, pupa, larva, and egg: Unknown.

Holotype male. BRAZIL: Pará: Parauapebas municipality, Serra dos Carajás, small order stream, 6°2’24.828”S; 50°17’38.184”W, 7–9.viii.2018. Pennsylvania light trap, leg. J.L. Gama Neto & J.M.F. Ribeiro. (alcohol; MPEG).

Distribution. Brazil (Pará). Type locality only.

Etymology. The term “carajas” refers to the type locality.

Figures

FIGURE 2. Helicopsyche (Feropsyche) carajas sp. nov. 2A, male forewing (upper) and hind wing (lower). 2B, VI sternal process, left lateral. 2C–2G, male genitalia: 2C, left lateral; 2D, ventral; 2E, dorsal; 2F, phallus, left lateral; 2G, phallus, ventral.