Leucotrichia extraordinaria Bueno-Soria, Santiago-Fragoso & Barba-Alvarez , 2001

Thomson, Robin E. & Holzenthal, Ralph W., 2015, A revision of the Neotropical caddisfly genus Leucotrichia Mosely, 1934 (Hydroptilidae, Leucotrichiinae), ZooKeys 499, pp. 1-100 : 17-18

Taxon classification Animalia Trichoptera Hydroptilidae

Leucotrichia extraordinaria Bueno-Soria, Santiago-Fragoso & Barba-Alvarez, 2001 Fig. 17

extraordinaria Bueno-Soria, Santiago-Fragoso & Barba Álvarez, 2001: 145 [Type locality: Mexico, Tabasco, Municipio de Huimanguillo, Arroyo las Flores, Villa de Guadelupe 2a sección Los Chimalapas, km 5 Ruta Malpasito-Carlos A. Madrazo, 17°22'05"N, 93°36'25"W; CNIN; male].

Diagnosis.

This species is similar to Leucotrichia bicornuta , Leucotrichia dianeae , and Leucotrichia tapantia sp. n. These species share a similar combination of characteristics present in the phallus and the posterolateral margin of sternum VIII, as discussed under Leucotrichia bicornuta . Leucotrichia extraordinaria can be easily recognized by the single peg-like seta that occurs on the apex of the posterolateral projection of sternum VIII; the other 3 species all bear long, prominent setae in this location. The posterolateral projection is also much narrower and more acute in Leucotrichia extraordinaria than in the other 3 species. Additionally, the concave posterior margin of sternum VIII, when viewed ventrally, is much more rounded in Leucotrichia extraordinaria than in Leucotrichia bicornuta . It also lacks the small mesal projection present in both Leucotrichia tapantia and Leucotrichia dianeae .

Description.

Male. Length of forewing 2.4 mm (n=1). Head unmodified, with 3 ocelli; antennae unmodified. Color in alcohol brown. Genitalia. Abdominal sternum VII with digitate mesoventral process. Sternum VIII posteroventral projection bearing single peg-like spine, in ventral view with posterior margin concave. Segment IX anterolateral margin convex, posterolateral margin irregular; in dorsal view anterior margin concave, posterior margin straight. Tergum × with dorsal sclerite simple; ventral sclerite broadest mesally, dorsal and ventral apices knoblike; membranous apex with 2 digitate projections and 1 large subtriangular projection extending posteriad. Subgenital plate with dorsal arm tapering apically, extending dorsad; ventral arm tapering apically, apex slightly hooked dorsad, in ventral view with small apical emargination. Inferior appendage dorsomesally “humped,” bearing single dorsal spine; in ventral view sinuate. Phallus apex bearing multiple pairs of elongate internal sclerites and pair of apical membranous lobes.

Material examined.

Holotype male: MEXICO: Tabasco: Municipio de Huimanguillo, Arroyo las Flores, Villa de Guadalupe 2a sección Los Chimalapas, km 5 Ruta Malpasito-Carlos A. Madrazo, 17°22'05"N 93°36'25"W, 26.vi.1999, J. Bueno and R. Barba (in alcohol) (UMSP000140695) (CNIN).

Etymology.

Extraordinaria, Spanish indicating “uncommon”, referring to the shape of sternum VIII.