Austrotinodes cressae, Thomson, Robin E. & Holzenthal, Ralph W., 2010

Thomson, Robin E. & Holzenthal, Ralph W., 2010, New Neotropical species of the genus Austrotinodes Schmid (Trichoptera: Ecnomidae), Zootaxa 2437, pp. 38-50 : 45

Austrotinodes cressae , new species

Fig. 4

Diagnosis. This species is closest to A. amazonensis Flint and Denning and A. ariasi Flint and Denning , differing from those species in the shape and setation of the lateral process of the phallus. In A. cressae , the lateral process has 1 basal, 2 mesolateral, and 1 subapical spines and is wide in lateral view, while in A. amazonensis and A. ariasi the lateral process has only 1 apical seta and is slender. The basomesal process of the phallus of A. cressae lacks spines. Additionally, in lateral view, the dorsal margin of the intermediate appendage of A. cressae is straight, while the margin of A. amazonensis and A. ariasi is curved.

Description. Male. Forewing length 4.1–4.3 mm (n=2). Body sclerites brown, dorsum of head dark brown with pale yellow and light brown setae; thorax light brown with pale yellow setae dorsally, light brown ventrally; leg segments with brown setae. Forewings covered with fine light brown setae with small patches of dark brown setae along costal margin. Genitalia. Segment IX deeply divided, sternum elongated; in lateral view, enlarging apically, ventral margin straight; in ventral view, apical margin broadly convex. Phallic guide sclerotized, elevated over inferior appendages; in lateral view, base narrow, apex sharply pointed, nearly reaching tip of inferior appendage; in caudal view, with double indentation. Inferior appendages fused mesally, attached subapicomesally on sternum IX; in lateral view, ovate; in ventral view, lateral lobes triangular, directed laterally, posterior margin convex with shallow mesal emargination. Tergum X divided into pair of semimembranous oval lobes, separated by deep emargination, bearing slender setae and 1 prominent long seta dorsally. Preanal appendage long, surface setose, margin crenulated, parallel-sided, apex broadly rounded. Intermediate appendage short, ca. 2/3rd length of the preanal appendage; in lateral view, straight; bifid apically; dorsal branch bearing 3 large spinelike subapical setae with small adjacent projections, ventral branch bearing 1 large subapical seta. Phallus with sclerotized phallobase and membranous apical region; lateral process elongate oval, with 1 basal, 2 mesolateral, and 1 subapical spines; with elongate, narrow basomesal process.

Type material. Holotype: Male, Venezuela: Sucre: Península de Paria, Puerto Viejo, “Rio el Pozo, 10˚43.073’N, 62˚28.569’W, 20 m, 3.iv.1995, Holzenthal, Flint, and Cressa ( UMSP 000041279) ( UMSP). Paratypes: same as holotype, 1 female; Venezuela: Guárico: P. N. Guatopo, 0.5 km N Est. La Colina, 600 m, 10.014˚N, 66.363˚W, 22.i.1994, Holenthal, Cressa, and Rincón, 1 male ( UMSP); Sucre: Parque Nac. Península de Paria, Uquire, R. La Viuda 10˚42.830’N, 61˚57.661’W, 15 m, 30.iii–1.iv.1995, Holzenthal, Flint, and Cressa, 1 female ( UMSP); Península de Paria, Santa Isabel, Rio Sta. Isabel, 10˚44.294’N, 62˚38.954’W, 20 m, 4.iv.1995, Holzenthal, Flint, and Cressa, 1 female ( UMSP).

Etymology. Named in honor of Dr. Claudia Cressa, an aquatic ecologist at the Universidad Central de Venezuela and friend and colleague of the authors.

Figures

FIGURE 4. Male genitalia of Austrotinodes cressae, new species: A, left lateral. B, dorsal. C, ventral. D, phallus, left lateral. E, phallus, dorsal. F, inferior appendage and phallic guide, caudal.