Oecetis marquesi Bueno-Soria

Blahnik, Roger J. & Holzenthal, Ralph W., 2014, Review and redescription of species in the Oecetis avara group, with the description of 15 new species (Trichoptera, Leptoceridae), ZooKeys 376, pp. 1-83 : 65

Oecetis marquesi Bueno-Soria Fig. 27

Oecetis marquesi Bueno-Soria 1981: 113, fig. 7 [holotype male, MEXICO, Nuevo León, Monterrey, Potrero Redondo (IBUNAM)].

Diagnosis.

This species has a distinctive appearance, with a very angulate projection on the posterior margin of each of the inferior appendages (more or less conforming to a ventral lobe), that makes it unlikely that it could be confused with any other described species of New World Oecetis .

Adult.

Forewing length: male (9.8-10.2 mm), female (8.2 mm). Color brownish-yellow, legs pale yellowish. Antennae yellowish-white with indistinct, narrow annulations between segments. Forewings nearly immaculate, spots very small and indistinct; those at base of discal and thyridial cells and base of fork V generally evident (on close inspection). Veins of forewing chord widely spaced, s and r-m veins slightly closer; chord very weakly, not contrastingly, pigmented. Setae along veins in apical part of forewing elongate, semi-prostrate, laterally diverging. Fringe of setae along costal margin of forewing relatively short, dense, not conspicuously erect.

Male genitalia.

Segment IX very short, with elongate setae along posterolateral margin. Tergum X with or without narrow, deflexed mesal lobe; if present, very short, with several tiny apical sensilla; short, paired lateral membranous projections present in either case. Preanal appendage moderately elongate, length about 3 times maximum width, simple in structure, apical setae elongate. Inferior appendage dorsally projecting, with acute, angular, spine-like projection on posterior margin at past midlength; anterior margin with rounded, mesally-curved projection with short, stiff setae; mesal surface of appendage with fine setae, but without thickened, curved setae. Phallobase, as viewed laterally, short, tubular, moderately curved ventrally; apex, as viewed caudally, with ventral margin U-shaped. Phallotremal sclerite forming short tubular collar; asymmetrical lateral sclerite present on right side, very prominent and distinct.

Material examined.

MEXICO: Chiapas: 2.9 mi S Jitotal, 11.viii.1967, O.S. Flint, Jr., 1 male paratype (pinned) (NMNH); Veracruz: Rio Jamapa, 6 km N Coscomatepec, 2.v.1981, C.M & O.S. Flint, Jr., 1 male, 1 female (pinned) (NMNH); same locality, 26.v.1981, C.M. & O.S. Flint, Jr., 1 male (pinned) (NMNH).