Leucotrichia dianeae Thomson & Holzenthal

Thomson, Robin E. & Holzenthal, Ralph W., 2015, A revision of the Neotropical caddisfly genus Leucotrichia Mosely, 1934 (Hydroptilidae, Leucotrichiinae), ZooKeys 499, pp. 1-100: 16

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Leucotrichia dianeae Thomson & Holzenthal

sp. n.

Taxon classification Animalia Trichoptera Hydroptilidae

Leucotrichia dianeae Thomson & Holzenthal   sp. n. Fig. 15


This species is similar to Leucotrichia bicornuta   , Leucotrichia extraordinaria   , 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   . Of these species, Leucotrichia dianeae   sp. n., is most similar to Leucotrichia tapantia   , as discussed under Leucotrichia tapantia   . The apical lobes of the phallus apex of Leucotrichia dianeae   arise from the same apicomesal location on the apex, while those of Leucotrichia tapantia   are separated from each other in more apicolateral locations. Additionally, the mesal projection on the posterior margin of sternum VIII is pointed in Leucotrichia dianeae   and rounded in Leucotrichia tapantia   . The rugose ventral surface of the apex of the mesoventral process on sternum VII separates Leucotrichia dianeae   from all 3 of the other species.


Male. Length of forewing 3.4-4.1 mm (n=10). Head unmodified, with 3 ocelli; antennae unmodified. Dorsum of head dark brown with yellow setae; thorax dark brown with dark brown and 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 pointed, rugose mesoventral process with small basal ridge. Sternum VIII lateral projection elongate, extending dorsad, apex bearing tuft of prominent setae (Fig. 15B), in ventral view with posterior margin concave with small, pointed mesal projection (Fig. 15D). Segment IX anterolateral margin convex, posterolateral margin irregular; in dorsal view anterior margin concave, posterior margin straight. Tergum × with dorsal sclerite slender; ventral sclerite semielliptic with tridentate posterior margin; membranous apex subquadrate. Subgenital plate with dorsal arm digitate; ventral arm slender, arched mesally, apex acute, in ventral view oblong. Inferior appendage broadest basally, apex digitate, bearing single dorsal spine; in ventral view with basal projection on outer margin and emargination on inner margin. Phallus apex bearing pair of internal apodemes, pair of broad mesolateral membranous lobes, apex divided into pair of lateral lobes.

Holotype male: COSTA RICA: Cartago, Reserva Tapantí, waterfall, ca. 1km (road) NW tunnel, 9.69°N, 83.76°W, 2-3.viii.1990, el. 1600 m, Holzenthal, Blahnik, and Muñoz (UMSP000201649) (UMSP). Paratypes: same data as holotype, 9 males (UMSP); Cartago, Reserva Tapantí, waterfall, ca. 1km (road) NW tunnel, 9.69°N, 83.76°W, 2-3.viii.1990, el. 1600m, Holzenthal, Blahnik, and Muñoz, 1 male (in alcohol) (UMSP); Cartago, Reserva Tapantí, waterfall, ca. 1 km (road) NW tunnel, 9.69°N, 83.76°W, 10.vi.1988, el. 1600m, C.M. and O.S. Flint and R.W. Holzenthal, 1 male (NMNH).


Named in honor of R. E. Thomson’s mother, Diane Thomson, who has always been supportive of her daughter’s entomological inclinations.