Leucotrichia extraordinaria
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Ordo: Trichoptera
Familia: Hydroptilidae
Genus: Leucotrichia
Name
Leucotrichia extraordinaria Bueno-Soria, Santiago-Fragoso & Barba-Álvarez, 2001 – Wikispecies link – Pensoft Profile
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.
Taxon Treatment
- Thomson, R; Holzenthal, R; 2015: A revision of the Neotropical caddisfly genus Leucotrichia Mosely, 1934 (Hydroptilidae, Leucotrichiinae) ZooKeys, (499): 1-100. doi
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