Polycentropus graciosa Hamilton & Holzenthal

Hamilton, Steven W. & Holzenthal, Ralph W., 2011, Twenty-four new species of Polycentropus (Trichoptera, Polycentropodidae) from Brazil, ZooKeys 76, pp. 1-53 : 9-11

Polycentropus graciosa Hamilton & Holzenthal sp. n. Fig. 5

Description.

Among the 6 new species in the urubici cluster, Polycentropus graciosa sp. n. resembles Polycentropus boraceia , Polycentropus galharada , Polycentropus froehlichi , and Polycentropus ancistrus in the shape of the inferior appendage with the elongate dorsolateral flange. In Polycentropus graciosa sp. n.,the dorsolateral flange of the inferior appendage is uniformly wide in lateral view and narrows relatively abruptly to a rounded or acute apex. Likewise, the caudomesal spine of the inferior appendage is absent, forming a rounded protrusion, and the mesoventral spine in posterior aspect is bifurcate unlike any of the aforementioned species.

Adult. Length of forewing (male) 7-8 mm. Body dark brown to black; dorsum of head and thorax black, clothed with long, black setae; base of forewing with long, erect black setae, general vestiture of forewing with fine black setae, lacking patches of pale setae; legs dark brown to black.

Male. Genitalia as in Fig. 5. Sternum IX in lateral view broadly subtriangular, about 3/4 height of segment VIII; in ventral view quadrate, anterior corners sharply rounded, sides slightly constricted mesally, anterior margin shallowly concave, posterior margin moderately concave with small, shallow convex medial region. Terga IX + X membranous. Intermediate appendage slightly curved dorsad, very long, length much greater than height of abdomen, basal region slightly expanded; in dorsal view nearly uniform in diameter throughout length, gradually narrowing apically. Mesolateral process of preanal appendage moderately long, digitate, apex roundly truncate, at base narrowly joined to dorsal portion of mesoventral process; mesoventral process directed caudad, broadly digitate, about 2/3 length of mesolateral process. Inferior appendage in lateral view moderately long, somewhat triangular; posteroventral margin protruding, rounded below shallow caudal emargination; dorsolateral flange low, slightly rounded dorsally, apically tapered to rounded point, without caudomesal spine; mesoventral spine present, broad, in lateral view acute, bifurcate, positioned well caudad; in ventral view inferior appendage broad basally, slender, tapering apically; mesoventral spine prominent; apex acute, bifurcate. Phallobase moderately short; in lateral view apicoventral projection narrow, approximately equal to apical diameter of phallobase apex, with 2 points; separated by shallow median groove; endothecal sclerotic band somewhat broad, becoming less sclerotized apically; endothecal spines absent; phallotremal sclerite wide in dorsal aspect. Subphallic sclerite U-shaped, arms long, pedicel with narrow lateral expansions; broad in lateral view, ventrally somewhat narrowed.

Holotype male:

BRAZIL: Paraná: Rio Cascata, Graciosa, road to Morretes, 25°20.214'S, 48°53.971'W, 750 m, 10.i.1998, Holzenthal, Melo, Almeida (UMSP000033088) (MZUSP).

Paratypes:

same data as holotype, 2 males, 1 female (UMSP), 1 female (MZUSP); Paraná: Quatro Barras, 900 m, 31.i.1993, V.O. Becker, 3 males, 2 females (NMNH).

Etymology.

Named for the type locality, a river flowing through the lush Atlantic forest of the Serra da Graciosa, Paraná, Brazil.