Dactylomegachile Mitchell, 1944

Durante, Silvana & Cabrera, Nora, 2009, Cladistic analysis of Megachile (Chrysosarus) Mitchell and revalidation of Megachile (Dactylomegachile) Mitchell (Hymenoptera, Megachilidae), Zootaxa 2284 (1), pp. 48-62 : 51-52

Subgenus Dactylomegachile Mitchell

( Figs. 2, 4, 6 , 8, 10, 12 , 14, 16, 18, 20 )

Megachile (Dactylomegachile) Mitchell, 1943: 670 . Type species Megachile parsonsiae Schrottky, 1913 . Original designation. Chrysosarus (Dactylomegachile) Mitchell 1980: 72 . Megachile (Chrysosarus) ; Michener 2000: 553 (Synonymy); Michener 2007: 586; Raw 2007: 30; Moure et al. 2007:

954.

Diagnosis. Dactylomegachile is distinguished from other members of group 1 ( Michener 2000) by the combination of the following characters: Antenna, veins, tegula and legs brown; female with mandible 4- dentate, without cutting edges, 4 th mandibular tooth truncate or incised and T6 dorsally truncate. Male with mandible 3-dentate, with submedial angle in the inferior margin ( Fig. 6 ); front coxae glabrous; front tarsi generally yellow; carina of T6 with the distal margin generally denticulate; pilosity of T7 with long hairs, sparse or dense; carina of T7 unmodified; S5 ( Fig. 16 ) with gradulus wide, postgradular area not raised basally not covering gradulus; S6 ( Fig. 18 ) without concavities on distal margin of pregradular area.

Redescription. Antenna, veins, tegula and legs brown. Eyes convergent below. Posterior margin of vertex straight or slightly concave (in the clade M. infima + M. leucographa + M. trocantina ).

Female. Mandible ( Fig. 2 ) 4-dentate without cutting edges, 4 th mandibular tooth truncate or incised. Antenna with pedicel generally subequal to F1, F1 generally subequal to F2. T6 generally straight in profile, apically truncate. Scopa black, ferruginous or yellow; S6 homogeneously covered by the scopal hairs.

Male. Mandible ( Figs. 4, 6 ) 3-dentate, with small or acute submedial angle on inferior margin. Hypostomal area without projection. Interantennal distance longer than antennocular distance. Front coxa ( Fig. 8 ) glabrous, with bristles in groups of 2–4 or in conspicuous patches, with short spine. Front tarsus generally yellow with black inner spot, flattened, not excavated anteriorly. Middle tibia with ferruginous or dark brown apical spur. Preapical carina of T6 ( Fig. 14 ) with the distal margin generally denticulate, generally with a slightly deep median emargination (absent in M. jenseni ). T7 ( Fig. 10 ) with long hairs, sparse or dense, median tooth slightly pronounced or absent, carina present. S1–S4 exposed. S5 ( Fig. 16 ) with gradulus wide, basally curved or truncate in M. vagata ; postgradular not raised basally, not covering gradulus, with simple hairs. S6 ( Fig. 18 ) with mid apical margin of pregradular area without concavities; pilosity of postgradular area short and sparse (except in M. jenseni and M. parsonsiae ), apical rim of with round or digitiform lateral lobes (absent in M. ctenophore ). S7 absent. Distal margin of S8 ( Fig. 20 ) generally slightly bilobated, lateral margin without hairs. Gonoforceps ( Fig. 12 ) with inner face narrow (except M. jenseni and M. vagata ), distal portion ventrally flexed (absent in M. parsonsiae and M. ctenophora ); penis valve subcylindrical, upper margin of its bridge slightly curved (except in M. vagata ), lower margin generally curved.

Figures

FIGURES 1–6. Mandible of female, frontal views, (1) M. (Chrysosarus) guaranitica. (2) M. (Dactylomegachile) parsonsiae. Mandibles of male, frontal views, (3) M. (Chrysosarus) guaranitica, (4) M. (Dactylomegachile) jenseni. Mandibles of males, lateral views (5) M. (Chrysosarus) guaranitica. (6) M. (Dactylomegachile) jenseni. Abbreviations: cl, clypeus; sma, submedian angle; th1, tooth 1; th2, tooth 2; th3, tooth 3; th4, tooth 4.

FIGURES 7–12. Front coxa of male, (7) M. (Chrysosarus) guaranitica, showing detail of spine; (8) M. (Dactylomegachile) leucographa. T7 of male, frontal views, (9) M. (Chrysosarus) guaranitica, (10) M. (Dactylomegachile) parsonsiae. Genitalia male, dorsal views, (11) M. (Chrysosarus) guaranitica, (12) M. (Dactylomegachile) ctenophora. Abbreviations: br, bridge; ca, carina; pbr, patch of bristles; sp, spine; th, tooth.

FIGURES 13–20. T6 of male, (13) M. (Chrysosarus) guaranitica. (14) M. (Dactylomegachile) leucographa. S5 of male. (15) M. (Chrysosarus) guaranitica. (16) M. (Dactylomegachile) parsonsiae. S6 of male. (17) M. (Chrysosarus) guaranitica. (18) M. (Dactylomegachile) parsonsiae. S8 of male. (19) M. (Chrysosarus) guaranitica. (20) M. (Dactylomegachile) parsonsiae. Scale bar = 0.50mm.