Oecetis dominguezi, Martín, Paola Rueda, Gibon, Francois-Marie & Molina, Carlos Israel, 2011

Martín, Paola Rueda, Gibon, Francois-Marie & Molina, Carlos Israel, 2011, The genus Oecetis McLachlan in Bolivia and northwestern Argentina (Trichoptera: Leptoceridae), with new species and identification key for males of Oecetis species from Mexico, Central and South America, Zootaxa 2821, pp. 19-38 : 25

Oecetis dominguezi , new species

Fig. 5

This species is similar to O. connata Flint (1974) , O. punctipennis ( Ulmer 1905) , and O. iguazu Flint (1983) . It is more similar to O. punctipennis , but the preanal appendages are narrower than those of O. punctipennis and longer and straighter than those of O. iguazu . Tergum X is more decurved in lateral view than that of O. punctipennis , but the general aspect is similar. In O. punctipennis , the inferior appendages are upcurved and each is produced in a digitate process. The inferior appendages of the new species are slightly upcurved and uniformly narrowed toward the apex in lateral view. In ventral view, the differences in the shape of inferior appendages are also important. In the new species, the inferior appendages are curved to the midline whereas in O. punctipennis they are straight. The phallic apparatus of O. dominguezi n. sp. is shorter and the apex is gradually broader at the tip than that of O. punctipennis .

Specific diagnosis. Oecetis dominguezi can be distinguished from other species by the triangular and decurved shape of tergum X in lateral view, the inferior appendage curved to the midline in ventral view, and the broader apex of the phallic apparatus.

Adult. Length of each forewing: 6.5 mm. Forewings brown, each with large, rectangular pale spot midway along anterior margin and several small pale spots in other areas of wing. Forewing with R2+3 branched at end of Sc. Hind wings each with R2+3 branched beyond end of R1; M and Cu unbranched ( Fig. 5 A).

Male genitalia. Segment IX annular, anterodorsal margin slightly and broadly produced mesodorsally, posterodorsal margin slightly and acutely produced mesodorsally. Preanal appendages long, straight, digitate. Tergum X triangular and decurved in lateral view ( Fig. 5 B); with median, V–shaped excision in dorsal view ( Fig. 5 C). Inferior appendages elongate laterally, each 3 times as long as width of base and with rounded, narrow apex in lateral view ( Fig. 5 B); narrower and strongly curved to midline in ventral view ( Fig. 5 D). Phallic apparatus short, slightly curved and broadened at apex, apically truncate with grainy dorsal surface in lateral view ( Fig. 5 E); with ventral lobe divided into 3, divergent smaller lobes in dorsal view ( Fig. 5 F).

Holotype male. BOLIVIA: Béni. Lake Colorada, near Trinidad, 14°48'21''S, 64°58'41''W, 16.xi.2002, ( IML).

Paratypes. BOLIVIA: Béni: Lake Granja Bella Vista, Río Blanco basin, 13°15'50''S, 63°42'33''W, 06.v.2006, ( IML) ― 2 males. Lake Curichal, near Bella Vista, 05.v.2006, (CBF-UMSA) ― 1 male.

Etymology. This species is dedicated to Dr. Eduardo Domínguez, Fundación Miguel Lillo, Tucumán Argentina, as thanks for his continuing assistance.