Helicopsyche (Feropsyche) disjuncta, Johanson, Kjell Arne & Holzenthal, Ralph W., 2004

Johanson, Kjell Arne & Holzenthal, Ralph W., 2004, Thirteen new species and new distribution records of Helicopsyche (Feropsyche) Johanson from Venezuela (Trichoptera: Helicopsychidae), Zootaxa 711, pp. 1-40 : 5-7

Helicopsyche (Feropsyche) disjuncta , new species

Fig. 8–14 , 87

When viewed laterally, the slender gonocoxite of H. disjuncta , new species, strongly resembles that of H. minima Siebold , from which it can be separated by the presence of basimesal lobes on the gonocoxite, the slightly concave dorsal margin of tergum X, and, in dorsal view, the widely concave apex of tergum X.

Male. Head: Antennal scape about 3/4 as long as eye diameter. Maxillary palp segment equally long, each about 2/3 eye diameter. Cephalic warts longitudinally oval, length about 2/3 eye diameter. Forewing 3.1 mm. Sternum VI process ( Fig. 8, 9 ) nearly 1/2 its segment length, covered by microtrichiae; nearly straight in lateral view ( Fig. 8 ), oriented posteroventrally, tubular along its length, except slightly wider at apex; apex lamellate ( Fig. 9 ).

Male genitalia ( Fig. 10–14 ). Segment IX, in lateral view ( Fig. 10 ), with anterior lobe hyperboloid, oriented anteriad, present midlaterally; anterodorsal margin slightly convex; anteroventral margin concave; in dorsal view ( Fig. 11 ), with inner margin widely Ushaped; in ventral view ( Fig. 12 ), with posterior process midventrally; lateral apodeme present as anteroventrally oriented, nearly straight line ( Fig. 10 ), fusing with anterior margin; sub­marginal line absent; tergal transverse apodeme apparently absent; sternal transverse apodeme absent; sternal longitudinal apodeme oriented anterodorsally. Segment X, in lateral view ( Fig. 10 ), oriented posteroventrad, curving posteriorly along its length; dorsally concave; apex narrowly rounded; in dorsal view, ( Fig. 11 ), parallel along its length, apicolateral corners produced posteriorly, leaving a wide, rectangular notch; with about 7 pairs of about equally long megasetae in group at produced corners. Superior appendage ( Fig. 10 ) strongly club­shaped, oriented posteriorly. Primary branch of gonocoxite, in lateral view ( Fig. 10 ), generally widening distally, with weakly undulate dorsal margin; apex strongly produced posteriorly and curving medially; central part of primary branch slightly wider than height of central part of Tergum X ( Fig. 10 ); anterodorsal margin nearly straight, smooth; posteroventral margin without undulations; basimesal lobe cone­shaped in lateral view ( Fig. 10 ), rounded in ventral view ( Fig. 12 ), with weakly concave median margins; with 2 distinct megasetae on apicodorsal margin; basal plate, in lateral view ( Fig. 10 ), slightly sigmoid, wide along its length; in ventral view ( Fig. 12 ), triangular, apex pointed. Phallus, in lateral view ( Fig. 13 ), with anterior half nearly straight, smoothly bent ventrad at midlength, dorsal margin weakly undulating; ventral margin smoothly angled; anterior 1/4 about 11/2 times as broad as its central part ( Fig. 13 ); in ventral view ( Fig. 14 ), phallobase present as narrow, lateral processes; endotheca weakly produced; sperm channel divided into thick posterior and slender anterior parts; posteroventral part strongly sclerotized.

Holotype male: VENEZUELA: Sucre: Parque Nacional Peninsula de Paria, Uquire, Río La Viuda, 10°42.830'N, 61°57.661'W, 15 m, 30.iii–1.iv.1995, Holzenthal, Flint & Cressa ( NMNH, in alcohol).

Distribution. Venezuela (Sucre).

Etymology. The name disjuncta , from the Latin disjunctus, means separate or distinct, and refers to the widely separated lateral corners of the Tergum X of the male genitalia. The name is to be treated as a noun in apposition.

Figures

FIGURE 87. Map of Venezuela showing distributions of H. angulata (circle), H. monda (rectangle), H. tachira (triangle down), H. disjuncta (diamond), H. linabena (cross), H. camuriensis (triangle up), and H. selanderi (star).

FIGURES 8 – 14. Helicopsyche disjuncta, new species, holotype. 8 — sternum VI process, lateral; 9 — sternum VI process, ventral; 10 — male genitalia, lateral; 11 — male genitalia, dorsal view; 12 — male genitalia, ventral; 13 — phallus, lateral; 14 — phallus, ventral.