Anapausis wirthi, Amorim, Dalton De Souza & Balbi, Maria Isabel P. A., 2006

Amorim, Dalton De Souza & Balbi, Maria Isabel P. A., 2006, A review of Anapausis Enderlein (Diptera: Scatopsidae) in the Neotropical Region, with four new species and comments on the phylogeny of the genus, Zootaxa 1300, pp. 1-29 : 8-11

Anapausis wirthi sp. nov.

( Figs. 6–11)

Material analyzed. HOLOTYPE male, COSTA RICA, San Marcos, Higuito, Pablo Schild col. ( NMNH). PARATYPE, 1 female, same date as holotype ( NMNH). Types at the USNM.

Diagnosis. Anapausis wirthi sp. nov. can be separated from other species of the genus by the shape of the gonostyle, especially its dorsal arm, by the bifid paramere, and by the shape of S10 divided into a pair of independent sclerites, with a rounded tooth close to the apex. The vesica is largely developed. There are no meral setae.

Description

Male. Measurements (in mm). Body length, 2.28; wing length, 1.46; wing width, 0.64.

Color. Regularly dark brown, light brown transverse strip on all femora and tibiae. Head elliptical, macrotrichia reaching anterior ¼ of occiput, microtrichia present; eyebridge complete; flagellum with 8 articles, single regular whorl of setae per flagellomere except for distal one with 2 whorls; mesal ocellus much smaller than lateral 2; no setae on front above antennae; labella small, maxillary palpus well developed, slender to apex, covered with setae and microtrichia, sensory pits and sensillae absent; cardo well developed. Thorax. Antepronotal setae, 38–47; proepisternals, 13; proepimerals, 9; spiracular sclerite setae, 13; anepisternals, 12–15/8–9; katepisternals, 18–21; mesepimerals, 8/8; merals, 0; subspiraculars, 3–6; supra­alars, 3–5; pedicelars, absent; a number of longer scutellar setae present, not in regular row. Wing ( Fig. 6). M1 long, broken at base; A1 produced; cell m1 with 3 macrotrichia; m2, 15; m4, 17–21; cuA2, 10–15; a1, 4–5. Abdomen. S6 rectangular, unmodified. Male terminalia ( Fig. 7 ). S7 with slight lateral projection, but definitely not lobose and well developed mesally; vesica well developed, pseudopenis present, distal tubular extension of aedeagus rather short; S8+9 present as bare strip connected to T8+9 laterally; Gc unrecognizable; Gs present, deeply bifid, ventral extension setose, digitiform, dorsal extension more sclerotized, with single inner seta ( Fig. 10 ); Pa well sclerotized, distally bifid ( Fig. 9 ); S10 completely divided into pair of digitiform distal sclerites with inner rounded tooth ( Fig. 8 ).

Female. As for male, except as follows. Measurements (in mm): body length, 2.24; wing length, 1.46; wing width, 0.62. Thorax. Antepronotal setae, 40; proepisternals, 12; proepimerals, 12; spiracular sclerite setae, 8; anepisternals, 15/7; katepisternals, 19; mesepimerals, 5/6; merals, 0; subspiraculars, 5; supra­alars, 4; pedicelars, absent; a number of longer scutellar setae not in a regular row. Wing. M1 long, broken at base; A1 produced; cell m1 bare; m2, 14–17; m4, 22–23; cuA2, 12–14; a1, 1. Terminalia similar to those of A. mayana , anterior margin more V­shaped, gonapophyses thiner basally, sternite 9 wider at anterior end.

Etymology. The name of the species is in honor of W.W. Wirth, a major entomologist with contributions to the systematics of Ceratopogonidae , Ephydridae , Curtonotidae , Canaceidae and other groups of dipterans, as well as coauthor of the Nearctic catalog of Diptera published in the 1960s.

Comments. The well­developed vesica, the short aedeagus distally, and the division of S10 into a pair of independent sclerites is shared in the genus only with A. mayana sp. nov., which appears to be the sister species of A. wirthi . These two species can be separated by the shape of the paramere, of the gonostyle, and of S10. The development of S10 and its displacement to a distal position in the terminalia have similar modifications in a group of species including, e.g., A. soluta and A. sulcata . The presence of macrotrichia on the wing membrane of cells m1 and m2 is a plesiomorphy shared with Nearctic and Palearctic species.

Figures

FIGURE 7. Anapausis wirthi. Holotype, male terminalia, ventral view.

FIGURES 8 – 10. Anapausis wirthi. Holotype, male terminalia sclerites. 8. Sternite 10. 9. Parameres. 10. Gonostyle.