Oxyethira tamandua Angrisano & Sganga

Angrisano, Elisa B. & Sganga, Julieta V., 2009, New species of Hydroptilidae (Trichoptera) from Salto Encantado Provincial Park (Misiones province, Argentina), Zootaxa 2162, pp. 57-68 : 65-67

Oxyethira tamandua Angrisano & Sganga , new species

Figures 24–26 , 35, 39, 41

Male. Forewing length 2.0 mm. Abdominal segment VII without sternal spines, but with a group of thick, long setae. Tergum and sternum of segment VIII with a deep V-shaped cleft; dorsal cleft short and wide, ventral cleft deep. Posterior margin very pigmented, especially in the dorsum, being very notorious in the specimens that were not cleared, which allows its differentiation from the other Argentinean species of the genus. Segment IX narrowed anteriorly, very asymmetric posteriorly, with 3 asymmetric lobes curved to the left, several spine-like lobes on the left side, and 2 membranous, setigerous lobes, partially hidden by segment VIII ( Figs. 24–26 ). Phallus short, wide, without spines or processes ( Fig. 24 ).

Diagnosis. This species seems to be related to group of species of uncertain placement: O. quinquaginta Kelley 1983 , from Brazil, and O. serruca Holzenthal & Harris 1992 and O. rareza Holzenthal & Harris 1992 , from Costa Rica, especially to the latter. In O. rareza , segments VII and VIII are similar to those of O. tamandua , new species; segment IX is asymmetric, with a pair of long, narrow, sclerotized, deeply curved posterior branches, that are interpreted as processes of the subgenital plate by Holzenthal and Harris 1992.

Holotype male. Argentina: Misiones: Parque Provincial Salto Encantado, 16–27.ii.2005, Angrisano & Abelando leg.

Paratypes. Argentina: Misiones: Parque Provincial Salto Encantado, 8–14.i.2006, Malaise trap, Angrisano & Bravo leg, 1 male.

Etymology. Named for one of the streams from Salto Encantado Provincial Park.

Figures

FIGURES 24 – 30. Figs. 24 – 26, Oxyethira tamandua, n. sp., male genitalia: 24: dorsal, 25: ventral, 26: lateral. Figs. 27 – 30, Oxyethira poapi, n. sp., male genitalia: 27: ventral, 28: lateral. 29 – 30. Phallus: 29: dorsal, 30: lateral.

FIGURES 31 – 43. Figs. 31, 36, Alisotrichia cainguas, n. sp.: 31: adult, lateral. 36: male genitalia. Figs. 32, 37, Ochrotrichia pora, n. sp.: 32: adult, ventral. 37: male genitalia. Figs. 33, 38, Paratrichia acuti, n. sp.: 33: adult, lateral. 38: male genitalia. Figs. 34, 40, Rhyacopsyche garuhape, n. sp.: 34: adult, ventral. 40: male genitalia. Figs. 35, 39, 41, Oxyethira tamandua, n. sp.: 35: adult, ventral. 39: male genitalia, dorsal. 41: male genitalia, lateral. Figs. 42, 43, Oxyethira poapi, n. sp., male genitalia: 42: lateral. 43: phallus apex, detail.