Atherimorpha lamasi, Santos, 2005

Santos, Charles Morphy Dias Dos, 2005, First record of genus Atherimorpha (Diptera: Rhagionidae) in Brazil, with description of a new species, Zootaxa 1021 (1), pp. 37-43 : 39-42

Atherimorpha lamasi sp. n.

Figures 1–9

Material. Holotype ♂, BRAZIL, Itatiaia, Maromba, state of Rio de Janeiro, 22º 22’S 44º 37’W, VI/1946, Barreto col. ( MZSP); 10 ♂ paratypes, the same as holotype ( MZSP), 1 ♀ paratype, the same as holotype ( MZSP); and 2 paratypes ♀ from Sapucaí­Mirim , Cidade Azul , state of Minas Gerais, 1400m, 22º 44’S 45º 44’W, 06/IX/1953, Travassos Filho, Pd. Pereira & Medeiros colls. ( MZSP).

Diagnosis. Arista with 4 flagellomeres, distal longer than the others, two short setae at tip. Gena and clypeus with black punctuations in females. Crossvein m­cu shorter than rm. Cubital posterior cell narrowly open. Head and thorax homogeneously gray, abdomen gray to brown. Posterior part of aedeagus long. Ejaculatory apodeme slightly exceeding base of gonocoxites.

Male. Body length 5.0–6.0 mm. Wing length 4.8–5.0 mm. General color gray. Eyes yellow to brown, facets homogeneous, ocellar tubercle dark brown with prominent bristles ( Figs. 1–2 ), ocelli brown to red. Gena and clypeus gray, clypeus retracted. Antenna dark brown; scape and pedicel subglobose, with long bristles; scape shorter than pedicel; first flagellomere suboval; arista with 4 flagellomeres, the distal longer than the others, with two short setae at tip ( Fig. 4 ). Maxillary palpus long, with two segments, distal one longer than the proximal, rounded distally, with iridescent bristles ( Fig. 2 ). Proboscis and labella dark brown. Occiput gray, with iridescent setae.

Thorax uniformly gray, mesoscutum with brown bristles, scutellum with iridescent bristles. Halteres bare, with yellowish stem and dark knob. Coxae gray with brown setae; femora and tibiae yellowish to brown, both with golden setae. Anterior third of wing membrane slightly brownish; pterostigma pigmented, long, filling almost entirely cell r 1; setulae on R 1; R reaching C far beyond R 1, sinuous distally; R 4 forking with almost right angle; crossvein m­m close to origin of M 2; crossvein m­cu shorter than r­m; posterior cubital cell narrowly open ( Fig. 5 ).

2+3

Abdomen gray to brown with iridescent hairs along the segments. Gonocoxite and gonostyle brown; gonostyle long, distally acuminated, outer margin convex, inner margin concave; gonocoxites separated from each other, antero­ventral parts covered by sternum IX ( Fig. 6 ); sternum IX semicircular, independent, lateral parts fused to gonocoxites; posterior part of aedeagus long; ejaculatory apodeme slightly exceeding base of gonocoxites; lateral ejaculatory process wide, projected obliquely; gonocoxal apodemes not extended beyond anterior margin of sternum IX; parameral apodemes slender; anterior margin of tergite IX not widely concave; cercus longer than wide, with long bristles ( Fig. 7 ).

Female. Body length 5.0–5.5 mm. Wing length 4.8–5.0 mm. Dichoptic eyes ( Fig. 3 ); gena and clypeus with black punctuations. Thorax and abdomen lighter than male; abdomen gray to brown, except for the two brown to yellow terminal segments, with iridescent bristles on all segments.

Hypogynial valves with more than ten long hairs each ( Fig. 8 ); anterior end of sternite IX rounded, distal apodemes short ( Fig. 9 ); cercus bisegmented, distal segment ovoid, shorter than the proximal segment, with a sensorial organ open apically with thick internal setae; proximal segment with pronounced posteroventral lobe ( Fig. 8 ).

Geographic distribution: Brazil: Minas Gerais (Sapucaí­Mirim) and Rio de Janeiro ( Itatiaia National Park ) .

Etymology: The species is dedicated to Dr. Carlos Lamas, curator of the Diptera collection of the MZSP.

Figures

FIGURES 1–5. Atherimorpha lamasi sp. n., 1 — ♂ head, frontal view, 2 — ♂ head, lateral view, 3 — ♀ head, frontal view, 4 — Antenna, 5 — Wing. Scale line: 0.1 mm.

FIGURES 6–9. Atherimorpha lamasi sp. n., ♂: 6 — Hypopygium, dorsal view, 7 — Epandrium, dorsal view, ♀: 8 — Epigynum, ventral view, 9 — Genital fork (s IX). Scale line: 0.05 mm.