Polycentropus inusitatus Hamilton & Holzenthal

Hamilton, Steven W. & Holzenthal, Ralph W., 2011, Twenty-four new species of Polycentropus (Trichoptera, Polycentropodidae) from Brazil, ZooKeys 76, pp. 1-53 : 43-44

Polycentropus inusitatus Hamilton & Holzenthal sp. n. Fig. 23

Polycentropus new species 9 Hamilton 1986: 140-142, 239; Fig. 6.45.

Description.

Polycentropus inusitatus sp. n.is most similar to Polycentropus cachoeira , but may be differentiated from it by the absence of the endothecal sclerotic band, the divided apicoventral process of the phallobase, and the shorter mesoventral process of the preanal appendage.

Adult. Length of forewing (male) 5.5-5.8 mm. Body brown; dorsum of head and thorax dark brown; forewings nearly denuded, membrane pale brown with white areas at r-m, m, m-cu crossveins (in alcohol); legs paler apically.

Male. Genitalia as in Fig. 23. Sternum IX in lateral view trapezoidal, about 2/3 height of segment VIII; in ventral view slightly trapezoidal, anterior corners nearly angular, sides constriction anteriorly, anterior margin nearly straight, posterior margin slightly concave with very broad, shallow convex medial region. Terga IX + X membranous. Intermediate appendage absent. Mesolateral process of preanal appendage short, apex rounded, shorter ventrally, at base broadly joined to mesoventral process; mesoventral process directed caudad, broadly truncate, about 1/2 length of mesolateral process. Inferior appendage in lateral view moderately long, rhomboidal; dorsolateral flange low, straight dorsally, with prominent caudomesal spine, exposed in lateral view; mesoventral spine absent; in ventral view inferior appendage rhomboidal, caudomesal spine prominent, acute. Phallobase short; in lateral view apicoventral projection broad, slightly shorter than diameter of apical diameter of phallobase apex, with 2 points; separated by narrow mesal split dividing apical 1/2; endothecal sclerotic band absent; with pair of large endothecal spines; phallotremal sclerite narrow in dorsal aspect. Subphallic sclerite U-shaped, arms long, pedicel absent; very narrow in lateral view.

Holotype male:

BRAZIL: Rio de Janerio: Brejo da Lapa, Itatiaia, Coll. Museum Nacional, R. J., no date (NMNH).

Paratype:

same data as holotype, 1 male (NMNH).

The holotype and the paratype were sent to the senior author by Luiz S. W. Terra, Estacao Aquicola, Vila do Conde, Portugal.

Etymology.

Latin for rare, uncommon, or unusual, in reference to our knowledge of only 2 specimens.