Leucotrichia tritoven Flint, 1996

Thomson, Robin E. & Holzenthal, Ralph W., 2015, A revision of the Neotropical caddisfly genus Leucotrichia Mosely, 1934 (Hydroptilidae, Leucotrichiinae), ZooKeys 499, pp. 1-100: 41-42

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Leucotrichia tritoven Flint, 1996


Taxon classification Animalia Trichoptera Hydroptilidae

Leucotrichia tritoven Flint, 1996   Fig. 43

tritoven   Flint, 1996: 89 [Type locality: Trinidad, streamlet, Lalaja Road, 10°43'N, 61°17'W; NMNH; male].


Leucotrichia tritoven   is most similar to Leucotrichia kateae   . In both of these species, the dorsal spine of the inferior appendage is located on a dorsomesal “hump” (Fig. 43A). There is also a pair of membranous lobes arising from the apex of the phallus in each of these species, from the base of which a pair of large, pointed sclerites also arises. A pair of elongate, apically curling sclerites on the phallus distinguishes Leucotrichia tritoven   from Leucotrichia kateae   , which lacks these elongate sclerites. Additionally, the dorsal arm of the subgenital plate in Leucotrichia tritoven   is digitate, whereas in Leucotrichia kateae   it is apically acute.


Male. Length of forewing 1.5-2.0 mm (n=24). Head unmodified, with 3 ocelli; antennae unmodified. Dorsum of head brown with light yellow setae; thorax brown with light yellow setae dorsally, brown ventrally; leg segments with brown setae. Forewings covered with fine yellow setae with dark brown setae at edges and apex. Genitalia. Abdominal sternum VII with digitate mesoventral process with small basal ridge. Sternum VIII in ventral view with posterior margin concave. Segment IX anterolateral margin produced mesally, posterolateral margin irregular; in dorsal view anterior margin concave, posterior margin concave. Tergum × with dorsal sclerite slender, elongate; ventral sclerite semielliptic; membranous apex suborbicular. Subgenital plate with dorsal arm digitate, apex truncate; ventral arm digitate, laterally obscured from view by inferior appendage, in ventral view triangular. Inferior appendage dorsomesally “humped,” apex rounded, bearing single dorsal spine; in ventral view with mitten-like “thumb” on inner margin (Fig. 43D). Phallus apex bearing U-shaped internal apodeme, pair of apical membranous lobes, and 2 pairs of elongate sclerites: 1st pair lateral, elongate, apically curled, 2nd pair acute, apicodorsal sclerites extending anteriad.

Material examined.

Holotype male: TRINIDAD: Lalaja Road, streamlet, 10°43'N, 61°17'W, elev. 520 m, 26.vi.1993, by net, O.S. Flint, Jr. and W.N. Mathis (USNM 105437) (NMNH). Paratypes: Same data as holotype, 3 males, 1 female (NMNH); TRINIDAD: Lalaja Road, Guanapo River, elev. 480 m, 10°43'N, 61°17'W, 26.vi.1993, by net, O.S. Flint, Jr. and W.N. Mathis, 2 males, 1 female (in alcohol) (NMNH); TOBAGO: Charlotteville, 4 km S, big waterfall, 11°19'N, 60°33'W, elev 125 m, 10.vi.1993, by net, O.S. Flint, Jr. and W.N. Mathis, 1 male (in alcohol) (NMNH); Roxborough, 6.5 km N, B1/5, elev. 390 m, 11°17'N, 60°35'W, 14.vi.1993, by net, O.S. Flint, Jr. and W.N. Mathis, 6 males (NMNH); VENEZUELA: Sucre Parque Nacional, Península de Paria, Uquire, Río La Viuda, 10°42.830'N, 61°57.661'W, elev. 15 m, 30.iii-1.iv.1995, Holzenthal, Flint, and Cressa, 10 males, 3 females (NMNH). Nontypes: GUYANA: Dubulay Ranch, Warniabo Creek, 5°39.8'N, 57°53.4'W, 14-19.iv.1995, O.S. Flint, Jr., malaise trap night collection, 1 male (in alcohol) (NMNH).