Leucotrichia interrupta 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: 26-27

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Leucotrichia interrupta Flint, 1991


Taxon classification Animalia Trichoptera Hydroptilidae

Leucotrichia interrupta Flint, 1991   Fig. 26

interrupta   Flint, 1991: 41 [Type locality: Colombia, Dpto. Antioquia, Quebrada Espadera, 7 km E Medellín, on road to Sta. Elena; NMNH; male].


Leucotrichia interrupta   can be separated from all other species in the genus by the unique form of the phallus apex, which is trilobed and has the 2 lateral lobes appearing more bulbous than lobe-like. A second characteristic unique to Leucotrichia interrupta   is the slender sclerite arising from the base of the “windows” of the midlength complex and following the anterior edge of each of the lateral lobes. The inferior appendage is also distinct in its large, subtriangular shape when viewed laterally.


Male. Length of forewing 3.5 mm (n=1). Head unmodified, with 3 ocelli; antennae unmodified. Dorsum of head brown with yellow setae; thorax dark brown with bright yellow setae dorsally, brown ventrally; leg segments with brown setae. Forewings covered with fine yellow setae, apical 1/4 with dark brown setae. Genitalia. Abdominal sternum VII with mesoventral process broken (indicated in Fig. 26D). Sternum VIII in ventral view with posterior margin very shallowly concave. Segment IX anterolateral margin produced mesally, posterolateral margin irregular; in dorsal view anterior margin concave, posterior margin straight. Tergum × with dorsal sclerite simple; ventral sclerite simple; membranous apex truncate. Subgenital plate with dorsal arm hollow, triangular (Fig. 26A); ventral arm slender, tapering apically, curved ventrad, in ventral view subovate. Inferior appendage subtriangular, without dorsal spine; in ventral view entirely fused, apically digitate. Phallus apex trilobed; lateral lobes bulbous and with slender, elongate, sinuate sclerite along outer edge; short spines present on dorsal surface of all 3 lobes.

Material examined.

Holotype male: COLOMBIA: Antioquia: Quebrada Espadera, 7 km E Medellín, rd. to Santa Elena, 24.ii.1983, O.S. Flint, Jr. (USNM 104528) (NMNH). Paratypes: Same data as holotype, 1 female (NMNH).