Scaptotrigona (Baryorygma) fimbriata, Engel, 2022

Engel, Michael S., 2022, Notes on South American stingless bees of the genus Scaptotrigona (Hymenoptera: Apidae), Part III: A revised infrageneric classification and new species, Journal of Melittology 2022 (111), pp. 1-29 : 25-27

Scaptotrigona (Baryorygma) fimbriata Engel, new species

ZooBank: urn:lsid:zoobank.org:act:AA2382FA-FA18-4A6F-8D2B-A85EBA7E13CE

( Figs. 39–41 )

DIAGNOSIS: This species is similar to the larger South American species of the subgenus and particularly to S. bipunctata (Lepeletier) in regards to facial paterning. However, the new species differs from all others in the group by the presence of distinct apical fimbriae on metasomal terga II–V.

DESCRIPTION: As described for S. totobi (vide supra) except as follows: ⚲: Total body length approximately 7.1–7.9 mm, forewing length (to base of humeral sclerite) 6.5–6.8 mm. Head wider than long, width 2.82–2.94 mm, length 2.33–2.42 mm; compound eye length 1.64–1.70 mm; upper interorbital distance 1.85–1.91 mm, lower interorbital distance 1.76–1.82 mm. Scape length 1.03–1.09 mm, slightly longer than torulocellar distance, torulocellar distance 0.97–1.03 mm. Clypeus approximately 1.6–1.7× as wide as long, length 0.70–0.82 mm, width 1.21–1.30 mm. Malar area approximately 1.7–1.8× flagellar diameter. Preoccipital lamella not extending into concavity, lower margin of concavity acutely rounded, projecting upward as short lamellate tooth.

Integument generally black to dark brown; clypeus and supraclypeal area chestnut brown; face below tangent of antennal toruli chestnut brown along inner orbit, blending to yellow or yellow brown by clypeus and antennal torulus; scape dark brown above, light brown to yellow brown ventrally; hypostomal borders yellow brown. Legs dark brown except coxae and trochanters brown.

Integument smooth and shining amid punctures; clypeus with small shallow punctures separated by a puncture width or frequently much more; supraclypeal area with similar punctures; lower face with small shallow punctures as on clypeus along inner orbit blending to nearly impunctate toward epistomal sulcus and antennal torulus; punctures becoming minute and separated by a puncture width or slightly more on frons and ocellocular area. Metasomal terga with minute contiguous punctures giving granulose appearance, except anterior-facing surface of tergum I smooth, pregradular areas and apical marginal zones finely imbricate and impunctate; tergum VI imbricate and largely impunctate; sterna finely imbricate.

Metasomal terga II–V with apical fimbriae composed of plumose setae tinged yellow or white; tergum I without black bristles laterally, or rarely with only a few minute bristles.

♀: Latet.

♂: Latet.

HOLOTYPE: ⚲, Bolivia: El Beni, Beni Stn., Palm Camp , NE of San Borja, 25 July 1988, R. W. Brooks ( SEMC).

PARATYPES: 9⚲⚲, Bolivia: El Beni, Beni Stn., Palm Camp , NE of San Borja, 25 July 1988, R.W. Brooks ( SEMC); 5⚲⚲, Bolivia: El Beni, Beni Stn., Palm Camp, Savannah , NE of San Borja, 28 July 1988, R . W. Brooks ( SEMC) .

ADDITIONAL MATERIAL: 1⚲, Bolivia: Santa Cruz Dept., 3.7 km SSE Buena Vista Hotel Flora y Fauna, 17°29.95’S, 63°33.15’W, 400–440 m, 4–9-XI-2002, primary forest FIT, R . Leschen ( SEMC); 1⚲, Paraguay: Contesa, III- 1954, F.H. Walz ( SEMC); 2⚲⚲, Peru: Madre de Dios, Pakita Bio. Stn., Reserved Zone, Manu National Park , 317 m, 11°56’41’’S, 71°17’0’’W, 22 Oct 2000, R . Brooks ( SEMC) .

ETYMOLOGY: The specific epithet is the Latin noun fimbria, meaning, “a fringe at the edge”, and the suffix – ātus, which forms adjectives from nouns and indicates possession of a quality or thing.

Figures

Figures 39–41. Worker of Scaptotrigona (Baryorygma) fimbriata, new species. 39. Lateral habitus. 40. Facial view. 41. Dorsal view of metasoma.