Paratrichia acuti 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 : 62-63

Paratrichia acuti Angrisano & Sganga , new species

Figures 17–19 , 33, 38

Male. Forewing length 2.0 mm. Legs with tarsal spur formula of 1-3-4. Head with 3 ocelli. Mesoscutellum with a transverse suture. Abdominal segments VII and VIII without modifications or sternal spines; lightly sclerotized and short, the length of both segments together is approximately equal to that of segment IX. Segment IX lengthened, sclerotized ventrally and open dorsally, sharp apically ( Figs. 17–18 ). Subgenital plate with a pair of processes, having first process lengthened posteriorly, extending laterally, and second one ventral, arched to midline and surrounding phallus.

Inferior appendages lightly sclerotized, very setose on margin and internally, basally wide in ventral view, almost touching on midline. Lateral appendages lengthened, very arched towards the venter, more sclerotized than inferior appendages; setae reduced; articulating ventrally with base of inferior appendages. Phallus simple, lengthened, longer than segment IX, with a triangular, membranous lobe at the apex ( Fig. 19 ).

Diagnosis. This new species is related to P. cebollati Angrisano 1995 , described from Uruguay. P. cebollati can be distinguished by: segment IX oval in ventral view and rounded anteriorly, inferior appendages approximately sigmoid in lateral view, segment VIII long, phallus with lightly different membranous lobes at the apex, and subgenital plate bearing the inferior appendages that are curved to dorsad. This is the only species of the genus known from Argentina.

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

Etymology. Referring to the Salto Acutí , one of the waterfalls from Salto Encantado Provincial Park.

Figures

FIGURES 13 – 19. Figs. 13 – 16, Ochrotrichia pora, n. sp., male genitalia: 13:, dorsal, 14: lateral, 15: ventral. 16: Phallus. Figs. 17 – 19, Paratrichia acuti, n. sp., male genitalia: 17: lateral, 18: ventral. 19: Phallus.

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.