Alisotrichia nessimiani, Santos, Allan Paulo Moreira, 2011

Santos, Allan Paulo Moreira, 2011, Four new species of the microcaddisfly genus Alisotrichia Flint (Trichoptera: Hydroptilidae) from southeastern Brazil, Zootaxa 3112, pp. 59-68 : 66-67

Alisotrichia nessimiani sp. nov.

( Figs. 20–23 )

Diagnosis. This new species is also placed in the A. orophila Group because it has the characteristic dorsal processes on segment VIII. Alisotrichia nessimiani sp. nov. is readily distinguished from other Alisotrichia species by its characteristic male genitalia. This new species has pair of lateral processes on the dorsum of segment IX like the previous species, but in A. nessimiani sp. nov. these processes curve downward in lateral view. Both species also have the posterior margin of segment VIII projected laterally, but in this new species, the mesal area is indented and the internal margin is serrated. The phallus with several paired processes on its apex is also distinctive for A. nessimiani sp. nov.

Description. Male body. Length 2.2 mm (n=1). General color in ethanol dark brown. Antennae each with 18 articles; scape enlarged, semicircular in anterior view; pedicel slightly longer than broad; flagellomeres short and setose; apical article tapering. Ocelli 2. Maxillary palpi each 5-articulated; labial palpi each 3-articulated. Mesoscutellum with transverse suture. Metascutellum approximately rectangular. Tibial spurs 0,2,4. Fore- and hind wings with long brown setae. Abdominal segment VII with ventromesal process ( Fig. 20 ), bifurcate in lateral view ( Fig. 22 ).

Male genitalia. Segment VIII in ventral view with posterior margin deeply indented mesally, lateral projections with internal margins serrate, narrowing to acute apices ( Fig. 20 ); in dorsal view with pair of processes each bearing elongate spine-like seta ( Fig. 21 ). Segment IX fused with segment X in dorsal view ( Fig. 21 ); reduced ventrally; pair of lateral spine-like processes curved downward in lateral view ( Fig. 22 ); pair of slender apodemes from anterolateral margins reaching segment V internally ( Figs. 20, 21 ). Segment X almost rectangular in dorsal view ( Fig. 21 ). Subgenital plate with anterior margin projected laterally, posterior margin rounded; with small hollow subapically ( Fig. 20 ). Inferior appendages absent. Phallus tubular, constricted mesally; apical area with 2 pairs of flattened sclerotized processes, pair of short finger-like processes and pair of spine-like processes ( Fig. 23 ); ejaculatory duct protruding subapically ( Fig. 23 ).

Material examined. Holotype male. BRAZIL, Rio de Janeiro State, Nova Friburgo municipality, Cascata, tributary to Rio Macaé , 22°21’54.9”S 42°15’20.5”W, 391 m, 08.iii.2009, G.A. Jardim & J.L. Nessimian leg., light trap ( DZRJ).

Etymology. This species is named in honor of Dr. Jorge Luiz Nessimian, collector of this species and who, as my advisor, has encouraged my research on Neotropical caddisflies.

Distribution. Brazil: Rio de Janeiro State.

Figures

FIGURES 20 – 23. Alisotrichia nessimiani sp. nov., male genitalia. 20: ventral view; 21: dorsal view; 22: left lateral view; 23: phallus, dorsal view.