Leucotrichia mutica Flint, 1991,

Thomson, Robin E. & Holzenthal, Ralph W., 2015, A revision of the Neotropical caddisfly genus Leucotrichia Mosely, 1934 (Hydroptilidae, Leucotrichiinae), ZooKeys 499, pp. 1-100: 30

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scientific name

Leucotrichia mutica Flint, 1991


Taxon classification Animalia Trichoptera Hydroptilidae

Leucotrichia mutica Flint, 1991  Fig. 31

mutica  Flint, 1991: 39 [Type locality: Colombia, Dpto. Antioquia, Quebrada Honda, Marsella, 12km SW Fredonia; NMNH; male].


This species is similar to Leucotrichia melleopicta  . These species share similarities in the phallus and the shape of the inferior appendage, as discussed under Leucotrichia melleopicta  . Leucotrichia mutica  can be distinguished from Leucotrichia melleopicta  by the basal ridge on the mesoventral process of sternum VII, the ovate shape of the ventral arm of the subgenital plate in ventral view, and the dorsal sclerite on the phallus, which is much smaller than that of Leucotrichia melleopicta  .


Male. Length of forewing 3.0 mm (n=1). Head unmodified, with 3 ocelli; antennae unmodified. Dorsum of head cleared, color brown; thorax brown with light yellow setae dorsally, brown ventrally; leg segments with golden brown setae. Forewings covered with fine yellow setae, apical 1/3 with dark brown setae. Genitalia. Abdominal sternum VII with acute mesoventral process with small basal ridge, apex rounded in ventral view. Sternum VIII in ventral view with posterior margin concave. Segment IX anterolateral margin convex, posterolateral margin straight; in dorsal view anterior margin sharply concave, posterior margin broadly concave. Tergum × with dorsal sclerite simple; ventral sclerite semielliptic with tridentate posterior margin; membranous apex truncate in dorsal view. Subgenital plate with dorsal arm not apparent; ventral arm broadest mesally, apex acute, laterally obscured from view by inferior appendage, in ventral view ovate. Inferior appendage dorsomesally “humped,” apex rounded, bearing single dorsal spine; in ventral view digitate. Phallus with basal half broken and missing; median complex not apparent; apex bearing single dorsal sclerite and pair of lateral sclerites; dorsal sclerite ovate, with apical emargination; lateral sclerites slender, sinuate.

Material examined.

Holotype male: COLOMBIA: Antioquia: Quebrada Honda, Marsella, 12 km SW Fredonia, elev. 1450 m, 22.ii.1983, O.S. Flint, Jr. (USNM 04525) (NMNH).