Alisotrichia nordestina, Alves & Takiya & Santos, 2023

Alves, André Almeida, Takiya, Daniela Maeda & Santos, Allan Paulo Moreira, 2023, Five new species of Alisotrichia Flint, 1964 (Trichoptera: Hydroptilidae: Leucotrichiinae) from Northeastern Brazil, Revista Brasileira de Entomologia (e 20230073) 67, pp. 1-11 : 7-9

Alisotrichia nordestina sp. nov.

urn:lsid:zoobank.org:act:B7058880-31E1-4334-A81E-DCBDC87EC505 ( Figs. 10 , 11 A-11E)

Alisotrichia sp. 3 in Takiya et al. (2016)

Description. Adult male. Length 1.40–1.75 mm (mean = 1.52 mm, SD = 0.07, n = 29). General color, in ethanol, light brown ( Fig. 10 ). Antennae 18-articuled; scape enlarged, subtriangular in anterior view ( Fig. 11E ); pedicel slightly globose, about the same length as that of the next two articles combined ( Fig. 11E ); flagellomeres short, covered by scale-like setae, apical article tapering ( Fig. 11E ). Ocelli 2. Maxillary palpi 5-articulated, 4th and 5th palpomeres thin, 5th palpomere about 1.5x longer than 4th. Labial palpi 3-articulated. Mesoscutellum with transverse suture. Metascutellum subtriangular. Tibial spurs formula 0,2,4, each pair of meso- and metatibial spurs with one spur about twice as long as the other. Fore- and hind wings with long dark brown setae, forewings with white setae forming spots ( Fig. 10 ). Abdominal segment VII with ventromesal process, bifurcate in lateral view, with dorsal branch slightly longer than ventral ( Fig. 11C ).

Male genitalia. Segment VIII with a pair of dorsolateral processes, directed posterad, each bearing an elongate, spine-like seta, extending beyond segment apex ( Figs. 11A, 11C ); with a subapical constriction, posterior margin with a pair of lateral acute sclerotized processes, directed posterad, in lateral view ( Fig.11C ); in ventral view, mesally with a pair of short and rounded lobes, separated by a shallow incision, lateral acute sclerotized processes slightly curved inwardly ( Fig. 11B ). Segment IX fused with segment X, reduced ventrally; with a pair of lateral elongate processes, curved downwards in lateral view; slightly curved inwards in dorsal view ( Figs. 11A, 11C ); anterolateral margin with a pair of slender apodemes reaching segment VII internally ( Fig.11 A-11C). Segment X long, membranous, almost rectangular in dorsal view ( Fig.11A ); dorsally with a pair of slender sclerites, with rounded and divergent apices ( Fig.11A ). Subgenital plate, in ventral view, short, not extending beyond half length of segment VIII; anterior portion projecting into a pair of rods; posterior portion trapezoidal ( Fig.11B ). Inferior appendages absent.Phallus tubular and short, constricted mesally; with a pair of apical capitate lobes, each one with internal margin concave, pointed projection at midlenght, and a rod-like projection at base ( Fig.11D ); apical portion covered by a thin, quadrangular membrane ( Fig.11D ); ejaculatory duct projecting between apical lobes ( Fig. 11D ).

Taxonomic notes. This new species has a pair of dorsolateral processes on segment VIII,thus, is placed in the orophila group. Alisotrichia nordestina sp. nov. is very distinctive and somewhat resembles A. macae Santos, 2011 , A. mathisi Harris & Flint, 2002 , and A. paxilla Harris & Flint, 2002 , particularly because of the pointed, sclerotized posterolateral processes on segment VIII ( Fig. 11 A-11C). However, the new species is readily distinguished from these other species by the shallow mesal incision on posterior margin of segment VIII in ventral view, forming a pair of short and rounded lobes ( Fig.11B ); and by the shape of the phallus apex, with a pair of capitate lobes, each one with the internal margin concave, a pointed projection, and an additional rod-like projection at base ( Fig.11D ).

Etymology: “Nordestina”, a Portuguese adjective, is the gentilic for those born in Northeast Region of Brazil and refers to the localities where specimens of this species have been collected.

Distribution: Brazil (Ceará, Sergipe). Caatinga and Atlantic Forest biomes.

Material examined. Holotype male: BRAZIL: Sergipe, Itabaiana, Parque Nacional da Serra de Itabaiana, Riacho Água Fria , 10°45’17”S, 37°20’32.4”W, 196 m, 17-19.vi.2014, Malaise trap, D.M. Takiya, A.P.M. Santos, W.R.M. Souza, A.C. Domahovski ( DZRJ).

Paratypes: same data as holotype, 7 males ( DZRJ) , 6 males ( UFBA) , 6 males ( INPA) , 6 males ( MNRJ) ; same data, but Riacho dos Negros, 10°44’50.8”S, 37°20’24”S, 202 m, 17.vi.2014, Pennsylvania trap, D.M. Takiya, A.P.M. Santos, W.R.M. Souza, & A.C. Domahovski leg., 2 males ( DZRJ) ; Ceará, Ubajara, Parque Nacional de Ubajara, Rio das Minas na altura do teleférico, 03°49’58”S, 40°53’53”W, 420 m, 20-27.iv.2015, Malaise trap, J.A. Rafael et al. leg., 1 male ( DZRJ) .

Figures

Figure 10 Alisotrichia nordestina sp. nov. Paratype male (in alcohol), dorsal habitus. Scale bar = 0.5 mm.

Figure 11 Alisotrichia nordestina sp. nov. Male genitalia (holotype): A–D. (A) dorsal view; (B) ventral view; (C) lateral view; (D) phallus, dorsal view. (E) antenna, frontal view. Abbreviation: lat. proc. = lateral process of segment IX. Scale bar = 0.1 mm.