Neomuscina instabilis Snyder, 1949

Pereira-Colavite, Alessandre & De, Claudio J. B., 2012, Taxonomy of Neomuscina Townsend (Diptera, Muscidae) from Brazil, Zootaxa 3504, pp. 1-55 : 19-21

Neomuscina instabilis Snyder, 1949

( Figs. 41–46 )

Neomuscina instabilis Snyder 1949: 6 (key), 30 (description); Snyder 1954: 424 (key); Pont 1972: 50 (catalogue); d’Almeida 1993: 7 –16 (synanthropy); de Carvalho et al. 1993: 58 (catalogue); Couri & de Carvalho 2002: 153 (key); Couri & de Carvalho 2005: 9 (listed); de Carvalho et al. 2005: 94 (catalogue); Rodríguez-Fernández et al. 2006: 98 (listed); Uribe et al. 2010: 462 –470 (synanthropy).

Diagnosis: acrostichal 0:1; dorsocentral 2:4; mid femur with three preapical setae; wing hyaline; male: intra-alars 2; katepisternum with dark setulae on posteroventral surface.

Color: general body coloration brown; frons dark yellow, apex darkened; facialia and parafacialia yellow; gena brown; antenna and palpus yellow; scutum dark brown with grey pruinosity; humeral callus and apex of scutellum brown; median and hind femora apex dark brown; calypters and halter yellow; wing hyaline.

Male. Length. Body: 5.0– 5.3 mm; wing: 5.8–5.9 mm.

Head: eyes separated from each other by 0.08–0.11 mm, at level of ocellar tubercle; 12–13 pairs of frontal setae; ocellar seta large and parallel; postocellar seta large and divergent; inner vertical seta small and convergent; outer vertical seta small and divergent.

Thorax: acrostichal 0:1; dorsocentral 2:4; intra-alar 1; fore tibia with a distinct submedian anterodorsal setae; apex of fore tibia with setae on dorsal, posterodorsal and posteroventral surfaces; mid femur with a row of setae on posteroventral surface from base to middle; mid femur with three preapical setae, on dorsal, posterodorsal and posterior surfaces; apex of mid tibia with setae on anterior, dorsal, posterodorsal, posterior, posteroventral, ventral and anteroventral surfaces; hind femur with a complete row of dorsal, posteroventral and anteroventral setae; hind femur with many distinct anterodorsal setae, not ordered in a row, extending from base to middle; hind tibia with one median anterodorsal seta and three median anteroventral setae; hind tibia with a anterior, anterodorsal, dorsal, posterodorsal, ventral and anteroventral setae at apex; wing with one dorsal and two ventral setae at apex of stem vein.

Abdomen: epandrium slightly flattened, in posterior view.

Female (differing as follows): Length. Body: 5.2–5.5 mm; wing: 5.8–5.9 mm; eyes separated from each other by 0.3–0.33 mm, at level of ocellar tubercle; 9–10 pairs of frontal convergent setae, except for upper two pairs, which are parallel; ocellar and postocellar setae large and divergent; inner vertical seta large and convergent, and outer vertical seta large and divergent; intra-alars 2; sternite VIII with strong spike-like setae; epiproct with four setae, setae in a square-shaped arrangement (2:2).

Comments: Snyder (1949) described N. instabilis believing that it could be a synonym of N. stabilis (Stein) . However, examination of the paratype of N. instabilis and the holotype of N. stabilis showed that the two species are distinct. Neomuscina instabilis has a much softer coloration, males with intra-alars 2, proepimeron and proepisternum without dark setulae. In N. instabilis males have a characteristic epandrium slightly flattened and females have sternite VIII with strong spike-like setae.

Holotype (not examined): AMNH. Type-locality: David District, Panama.

Type material examined: Paratypes: PANAMA. 1 male “3 / Para- / type | David. Rep. de Panama / VIII-29-43 / F.M. Snyder col. | Brit. Mus. / 1950–249 | Paratype 3 / Neomuscina / instabilis / Snyder” ( BMNH) \ 1 female “Ƥ / Para- / type | David. Rep. de Panama / VIII-29-43 / F.M. Snyder col. | Brit. Mus. / 1950–249 | Paratype Ƥ / Neomuscina / instabilis / Snyder” ( BMNH) \ BRAZIL. Rio Grande do Norte. 1 male “ Natal, BRASIL / Feb. 5–24–1943 / F.M. Snyder” ( MNRJ).

Other material examined: BRAZIL. Bahia. 1 female “Encruzilha, Bahia, BRASIL / Seabra & Roppa, XI-72 ” ( MNRJ) \ Espírito Santo. 1 female “Linhares, Espírito Santo, Brasil / P.C. Elias, X-72 ” ( MNRJ) \ Minas Gerais. 1 female “Belo Horizonte, Minas, BRASIL / Paulo Lide, 12–16-II-74 ” ( MNRJ) \ Mato Grosso. 15 males and 18 females “Cáceres, MT / 13.XI.1984 / Buzzi, Mielke, Elias / Casagrande leg / Proj. POLONOROESTE” ( DZUP) \ 1 male and 10 females, same locality and collector, 21.XI.1984 ( DZUP) \ 1 males and 4 females, same locality and collector, 01.XII.1984 ( DZUP) \ 3 males and 6 females, same locality and collector, 03.XII.1984 ( DZUP) \ 7 males and 5 females, same locality and collector, 09.XII.1984 ( DZUP) \ Mato Grosso do Sul. 3 males and 3 females “Mun. Dourados, Mato Grosso, BRASIL / Alvarenga & Roppa, III-74 ” ( MNRJ) \ Paraná. 1 male “ BRASIL, PR, Morretes / Parque Estadual do Pau Oco / Malaise – Ponto T5 / 10-13.IV.2002, M.T. Tavares & eq. col.” ( MZUSP) \ Rio de Janeiro. 8 males and 17 females “Jacarepaguá, Rio de Janeiro / peixe and fígado / S.M.O. Cordello col., I- 89 ” ( MNRJ) \ Sergipe. 1 female “ BRASIL, SE, Santa Luzia do Itanhy Crasto / 11º22’31,4” S 37º24’ 53,9 W / Malaise – Armadilha – Bosque 4 / 29.VII-1-VIII.2001, M.T. Tavares & eq. col.” ( MZUSP) \ 1 male and 1 female “ BRASIL, SE, Santa Luzia do Itanhy Crasto / 11º22’32,8” S 37º25’ W / Malaise – Armadilha Bosque 2 / 30.VII-2- VIII.2001, M.T. Tavares & eq. col.” ( MZUSP) \ 1 female “ BRASIL, SE, Santa Luzia do Itanhy Crasto / 11º22’39,6” S 37º25’ 04,4 W / Malaise – Armadilha – Trilha 1 / 1–4.VIII.2001, M.T. Tavares & eq. col.” ( MZUSP).

Geographical distribution: Brazil (Bahia [new rec.], Espírito Santo [new rec.], Mato Grosso [new rec.], Mato Grosso do Sul [new rec.], Minas Gerais [new rec.], Paraná, Rio de Janeiro, Rio Grande do Norte [new rec.], Sergipe [new rec.] and São Paulo), Colombia, Panama (type-locality) and Trinidad and Tobago.

Figures

FIGURES 41 – 46. Neomuscina instabilis. Male terminalia: 41. Fifth sternite, dorsal view; 42. Epandrium, surstylus and cercal plate, lateral view; 43. Epandrium, surstylus and cercal plate, posterior view; 44. Aedeagus, lateral view. Female terminalia: 45. Dorsal view; 46. Ventral view. (Scale 0.5 mm)