Alisotrichia macae, 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 : 65-66

Alisotrichia macae sp. nov.

( Figs. 16–19 )

Diagnosis. Alisotrichia macae sp. nov. belongs to the A. orophila Group due to the pair of dorsal processes on segment VIII each bearing a very long spine-like seta. This species is similar to A. mathisi Harris & Flint, 2002 , and A. paxilla Harris & Flint, 2002 , on the basis of the spine-like processes on the posterior margin of male segment VIII, but it can be easily distinguished by other features of male genitalia, including the dorsal processes of segment VIII elongate, divergent posteriorly and each with a very long seta anteriorly (short and posteriorly produced in A. mathisi and A. paxilla ); the pair of lateral processes on the dorsum of segment IX, curved upward in lateral view (both A. mathisi and A. paxilla lack these processes); and the broader posterior portion of the phallus.

Description. Male body. Length 2.0 mm (n=1). General color in ethanol 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. 16 ).

Male genitalia. Segment VIII, in ventral view, with pair of stout spine-like processes on posterior margin ( Fig. 16 ); in dorsal view, with pair of sclerotized slender and elongate processes, divergent posteriorly and each bearing 1 very long spine-like seta anteriorly ( Fig. 17 ). Segment IX fused with segment X in dorsal view ( Fig. 17 ), with pair of lateral slender and elongate processes, curved upward in lateral view ( Fig. 18 ); reduced ventrally; pair of slender apodemes from anterolateral margins reaching segment VI internally ( Fig. 16 ). Segment X short, almost rectangular in dorsal view ( Fig. 17 ). Subgenital plate rounded apically and slightly emarginated, mesally with oblong opening ( Fig. 16 ). Inferior appendages absent. Phallus tubular and constricted mesally ( Fig. 19 ); basal portion inflated, apical half wide anteriorly, narrowing posteriorly with internal plate-like structure, and with ejaculatory duct protruding subapically ( Fig. 19 ).

Material examined. Holotype male. BRAZIL, Rio de Janeiro State, Macaé Municipality, Rio São Pedro, 22°13’47.6”S 42°08’04.7”W, 470 m, 20.iii.2009, G.A. Jardim & J.L. Nessimian leg., light trap ( DZRJ).

Etymology. This species is named in reference to the type locality. Macaé originates from Tupi-guarani, and refers to the ‘macabaíba’ fruit (date palm).

Distribution. Brazil: Rio de Janeiro State.

Figures

FIGURES 16 – 19. Alisotrichia macae sp. nov., male genitalia. 16: ventral view; 17: dorsal view; 18: left lateral view; 19: phallus, dorsal view.