Hydroptila cressae Thomson & Holzenthal

Thomson, Robin E. & Holzenthal, Ralph W., 2012, New species and records of Hydroptilidae (Trichoptera) from Venezuela, ZooKeys 185, pp. 19-39 : 21

Hydroptila cressae Thomson & Holzenthal sp. n. Fig. 2

Diagnosis.

This species is most similar to Hydroptila denza Ross, 1948, but differs in the shape of the projection on the posterolateral margin of abdominal segment IX. This projection is more pointed and is curved downward, or decurved, in Hydroptila cressae , while it is straight and more blunt in Hydroptila denza . The triangular subgenital process seen in Hydroptila denza is not apparent in Hydroptila cressae .Additionally, tergum X of Hydroptila cressae contains an internal apodeme that is not apparent in Hydroptila denza .

Description.

Male. Length of forewing 2.0 mm (n=1). Head unmodified, without ocelli; antennae unmodified. Tibial spur count 0, 2, 4. Dorsum of head brown with pale yellow setae; thorax brown with light brown setae dorsally, light brown ventrally; leg segments with light brown setae. Forewings covered with fine light brown setae with small dark brown patch of setae at apex. Genitalia. Abdominal sternum VII with simple, slender, pointed mesoventral process. Segment VIII unmodified. Segment IX anterolateral margin convex, posterolateral margin with pointed projection, curving slightly ventrad; dorsally with posterior margin convex. Inferior appendage setose, with narrow base, apex truncate with pair of dark points on internal face. Tergum X membranous, extending past inferior appendage, containing internal sclerotized apodeme (see Fig. 2A). Phallus narrow, elongate; apex membranous, ovate, with elongate, slender spines extending past membranous region.

Material examined.

Holotypemale:VENEZUELA: Bolívar: Gran Sabana, E. Pauji, “Río Curvita", 04°31.237'N, 61°31.591'W, 869 m, 15-16.vii.2010, UV light, Holzenthal, Thomson, Cressa (UMSP000095196) (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.