Osmia (Diceratosmia) stangei Genaro, 1029

Rightmyer, Molly G., 2017, A revision of the subgenus Osmia (Diceratosmia), with descriptions of four new species (Hymenoptera, Megachilidae), Zootaxa 4337 (1), pp. 1-37 : 21

Osmia (Diceratosmia) stangei Genaro

( Figs 4B , 11B )

Osmia (Diceratosmia) stangei Genaro 2001: 1029 –1030. [Holotype male: Gainesville]

Diagnosis. Osmia stangei is distinguished from all other North American Osmia by the posteriorly emarginate axillae, each of which forms a distinct posterolateral angle. Males of this species are also distinguished from all other Diceratosmia except O. aliciae and O. lacunosa by the evenly convex, not emarginate, S3. Both sexes are similar to the known male of O. lacunosa (but not O. aliciae ) by the carinate omaulus; however, in O. lacunosa , the omaulus is developed into a very strong carina, while in O. stangei the omaulus is weakly carinate. Males of O. stangei and O. lacunosa are clearly distinguished by the length of F1 (subequal to F 2 in O. stangei , nearly half the length of F 2 in O. lacunosa ), as well as the long tuft of hair medioapically on S 3 in O. stangei (S3 with broad, short tuft of hair medioapically in O. lacunosa ) and the lack of pits or pockets in the suture between the mesoscutum and mesoscutellum (three pockets present in this suture in O. lacunosa ).

Although the female of O. lacunosa is not currently known, it is expected to have a carinate omaulus since this structure is conserved between sexes; unlike females of O. stangei , the female of O. lacunosa is expected to have pits or pockets in the suture anterior to the mesoscutellum.

Distribution. Endemic to Hispaniola, perhaps restricted to coastal areas. Described from two proximal sites on the northernmost coast of the Dominican Republic, the new record expands the distribution to the southernmost coast of the Dominican Republic ( Fig. 18 ).

Material Examined. Dominican Republic: Prov. Pedernales, Cabo Rojo, 8.5 km N, 30m, 9 Aug 1999, M.A. Ivie, beating vegetation; Prov. Pedernales, Sabana de Sansón . 18 Aug 1973, F. Marcano.

Floral Associations. Aracaceae: Haitiella ekmanii .

Figures

FIGURE 4. Dorsum of mesosoma showing posterior half of scutum, scutellum and axilla: A) male O. lacunosa (HOLO 75), B) female O. stangei (BBSL 989171). Scale bar = 0.25 mm.

FIGURE 11. Female habitus lateral view: A) O. spinulifera (HOLO 78), B) O. stangei (BBSL 989171). Scale bar = 0.5 mm.

FIGURE 18. Known distributions of O. conjunctoides (green triangles), O. exquisita (white circles), O. gonzalezi (red circles), O. lacunosa (yellow circles), O. spinulifera (blue circles), and O. stangei (purple triangles). Scale bar = 200 km.