Five new species of Polycentropodidae (Trichoptera) from Ecuador and Venezuela Author Hamilton, Steven W. Author Holzenthal, Ralph W. text Zootaxa 2005 810 1 14 journal article 10.5281/zenodo.170590 22b7f18d-d80f-41c9-a21b-7d4114bd504a 1175­5326 170590 Polycentropus cressae Hamilton and Holzenthal , new species Fig. 1 Polycentropus cressae n. sp. is similar to P. a z t e c u s , P. gertschi and P. neblinensis n. sp. in the possession of a single pair of anterior spines in the phallic membranes below the phallic sclerite ( Fig. 1 E & F) in addition to another more mesal group of spines. In P. cressae and P. neblinensis , the anterior (basal) pair of spines is large and reminiscent of bull’s horns. In P. cressae , the spines in the mesal group ( Fig. 1 E & F) are less numerous (35– 40) and larger than those in P. neblinensis (>50). Polycentropus aztecus and P. gertschi have a single pair of spines in the anterior group that are notably smaller and more similar to those in the mesal group and those in the mesal group are 4 and 6 in number, respectively. Polycentropus cressae is unique in the number of heavier mesal spines in the phallic membranes (ca. 35–40; Fig. 1 E & F), the lateral flanges on the posterior margins of the phallobase ( Fig. 1 E), the narrow ventromesal process of the phallobase with a shallow apical emargination ( Fig. 1 E & F), the narrow lateral face of the inferior appendage ( Fig. 1 A), and the simple triangular shape of the preanal appendage in lateral view ( Fig. 1 A). Adult. Length of forewing: male 6.5–7.0 mm (n=3), female 7.5–8.2 mm (n=2). Body pale brown to yellow, legs stramineous, dorsum of head and thorax brown, clothed with long, dark setae; general vestiture of forewing with fine, brown to dark brown setae, with many scattered areas of golden setae, base of forewing with long, erect setae. Male. Genitalia as in Fig. 1 . Sternum IX in lateral view subtriangular, in ventral view quadrate; anterior margin shallowly concave, posterior margin slightly produced medially. Tergum IX and X membranous. Intermediate appendage straight, slightly angled basally, short, exceeding preanal appendage by less than 1/4th its length; basal region simple, not expanded; apex digitate, with apical setae. Preanal appendage short, densely setose, triangular, broad basally; mesoventral process absent. Inferior appendage densely setose, short, subtriangular, wide dorsoventrally, subequal to length; dorsolateral flange narrowly rounded; ventrally with dorsally­directed caudomesal point, exposed in lateral view; in ventral view, inferior appendage subtriangular, caudomesal point prominent, acute; in caudal view, inferior appendage subtriangular, caudomesal point broadly triangular. Phallobase very short, apicolateral corner produced into short flange; apicoventral projection long, narrow, with pair of points; phallic membranes with anterior and mesal groups of spines (although probably reversed in evaginated phallus), anterior group consisting of long, paired, curved spines, mesal group of many (35–40) small spines; phallic sclerite oval (difficult to discern, especially apically). Subphallic sclerite U­shaped in caudal view. FIGURE 1. Polycentropus cressae , new species . Male genitalia: A—lateral; B—dorsal; C—ven­tral; D—caudal; E—phallus, lateral; F—phallus, dorsal. Holotype male. VENEZUELA : Falcón: P[arque]. N[acional]. Sierra de San Luis, Río Negro, 11º11.750'N , 69º41.454'W , el. 1371 m , 8–9.vi.2001 , Holzenthal, Blahnik, Paprocki, Cressa ( UMSP 000074848) ( UMSP ) Paratypes : Same data as holotype— 1 male , 1 female ( UMSP ), 1 male , 1 female ( NMNH ). Etymology. We take great pleasure in naming this species in honor of Dr. Claudia Cressa , Universidad Central de Venezuela , in recognition of her contributions to the study of Venezuelan aquatic insects and her generous support of our work in Venezuela .