Oecetis traini, new species

Fig. 14

This species is closely related to O. scoparia Flint (1974) and O. peruviana (Banks 1924). These 3 species have tergum X divided into a single dorsal lobe and paired ventral lobes. The phallic apparatus of O. scoparia and O. traini n. sp. is similar.

Specific diagnosis. Oecetis traini is characterized by the dorsal, setose, rod–like process and ventral, membranous, forked portion of tergum X. The inferior appendages are large, each with a subapical process visible in ventral and lateral views.

Adult. Length of each forewing: 7.5 mm. Forewings each with R2+3 branched at midpoint of stigma. Hind wings each with R2+3 and Cu1 branched near edge of wing; M branched more deeply (Fig. 14 A).

Male genitalia. Segment IX annular and broad, with 2 posterodorsal knobs (Figs. 14 B–C). Preanal appendages oval with rounded apices (Figs. 14 B–C). Tergum X with dorsal and ventral portions: Dorsal, digitate portion bearing setae at apex in lateral and dorsal views (Figs 14 B–C); ventral portion subtriangular and with ventral digitate indentation at apex in lateral view, (Fig. 14 B), with shallow median excision in dorsal view (Fig. 14 C). Inferior appendages elongated, 3 times as long as width of base; dorsal preapical lobe rounded and with posterior, acute projection in lateral view (Fig. 14 B); straight and slightly concave mesally, with median setose process in ventral view (Fig. 14 D). Phallic apparatus short, curved and slightly broadened at tip (Fig. 14 E); broad, almost hexagonal, narrowed at posterior extremity and bearing 2 internal square sclerites in dorsal view (Fig. 14 F), possible dark ends of U-shaped phallotremal sclerite.

Holotype male. BOLIVIA: Lake Bay, Río Manuripi basin, 03.viii.2007, (IML).

Paratypes. BOLIVIA: Lake California, near Bella Vista, 10.v.2006, (CBF-UMSA) ― 4 males, Lake Granja, near Bella Vista, 13°15'50''S, 63°42'33''W, 06.v.2006, (IML) ― 3 males.

Etymology. This species is dedicated to Russell E. Train who, with support of the World Wildlife Fund (WWF), made possible some invertebrate sampling in the Bolivian Amazon.