Boreallodape baltica, ? Engel, 2001

ENGEL, MICHAEL S., 2001, A Monograph Of The Baltic Amber Bees And Evolution Of The Apoidea (Hymenoptera), Bulletin of the American Museum of Natural History 2001 (259), pp. 1-1 : 1-

Boreallodape baltica , new species Figures 48–52 Plates 4a,b, 5b

DIAGNOSIS: This species is most similar to B. striebichi but can be distinguished by the glabrous basal area of the propodeum, the more well­spaced pleural punctures (separat­ ed by smooth integument), and the presence of a distinct impunctate region on the hypoepimeral area.

DESCRIPTION: Female. Total body length 4.47 mm; forewing length 2.56 mm. Head wider than long (length 1.03 mm, width 1.20 mm). Upper interorbital distance 0.75 mm; lower interorbital distance 0.60 mm. Interocellar distance 0.22 mm; ocellocular distance 0.17 mm; median ocellus to lateral ocellus 0.08 mm. Intertegular distance 0.80 mm. Basal vein distad cu­a by two times vein width; second abscissa Rs basad 1m­cu by four times vein width; 2rs­m relatively straight, distad 2m­cu by two times vein width; first submarginal cell longer than second submarginal cell.

Labrum with small punctures separated by 2–4 times a puncture width, integument between smooth. Clypeus with exceedingly faint, small punctures sparsely scattered. Supraclypeal area sculptured as on clypeus. Remainder of face with sparse, small punctures, integument between smooth, punctures become more closely packed (separated by two times a puncture width) toward upper part of face and vertex, integument between smooth; small impunctate zone lateral to and bordering lateral ocellus, impunctate zone less than 1OD in width and length. Gena with small punctures separated by 1–2 times a puncture width, integument between smooth; postgena sculptured as on gena. Pronotum with small punctures separated by 1–2 times a puncture width, integument between smooth. Mesoscutum with small punctures separated by a puncture width. Tegula with small, faint punctures on inner two­thirds, punctures separated by 1–2 times a puncture width. Scutellum with small punctures separated by 2–3 times a puncture width, integument between smooth. Metanotum with minute punctures separated by a puncture width or less, integument between smooth. Pleura strongly punctured, punctures approximately twice the diameter of those on mesoscutum, punctures separated by 1–1.5 times a puncture width except lower half of hypoepimeral area impunctate, integument between smooth. Metepisternum sculptured like mesepisternum except punctures separat­ ed by a puncture width or less and slightly smaller. Basal area of propodeum, metapostnotum, and posterior surface of propodeum impunctate and smooth; lateral surface of propodeum with small punctures separated by a puncture width, integument between smooth. First metasomal tergum impunctate; T2 with coarse, faint punctures separated by a puncture width or less except central disc impunctate and punctures bordering this area more widely separated and more faint; remaining terga with coarse, faint punctures separated by a puncture width or less, without impunctate zone on central discs.

Integumental coloration not preserved. Wing membrane hyaline; veins strong and dark brown.

Setae simple, minute or short, and sparse except those of sterna erect, short and more dense.

MATERIAL: Eight specimens. Holotype. Female, B­JH 152 ( AMNH) labeled ‘‘Baltic amber: Eocene, Kaliningrad, Yantarny’’ // ‘‘ Holotype, Boreallodape baltica Engel’’. Paratype. Female, Nr. 1–5: 1967 ( ZMUC) labeled: ‘‘ Apidae, C. V. Henningsen , 1–5, 1967’’ // ‘‘ Paratype, Boreallodape striebichi Engel’’. This specimen is missing the very apex of the head (right mandible, lateral two­thirds of labrum, apex of right compound eye, and lateral third of clypeus), which is right at the surface of the amber. There are also some thin layers of Schimmel on the bee.

Paratype. Female, Nr. 810 ( CDTG) labeled: ‘‘Nr. 810’’ // ‘‘ Paratype, Boreallodape baltica Engel’’.

Paratype. Female, Nr. 873 (CHFG) labeled: ‘‘Nr. 873, Balt. Bernstein’’ // ‘‘ Paratype, Boreallodape baltica Engel’’.

Paratype. Female, Nr. 1253 (CHFG) labeled: ‘‘Nr. 1253, Balt. Bernstein’’ // ‘‘ Paratype, Boreallodape baltica Engel’’.

Paratype. Female, Nr. 1256 (CHFG) labeled: ‘‘Nr. 1256, Balt. Bernstein’’ // ‘‘ Paratype, Boreallodape baltica Engel’’.

Paratype. Female, Nr. 70 (CJDL) labeled: ‘‘Nr. 70’’ // ‘‘ Paratype, Boreallodape baltica Engel’’.

Non­type. Female, B­W 159 (AMNH) labeled: ‘‘Baltic amber: Eocene, Kaliningrad, Yantarny’’ // ‘‘ Boreallodape baltica? Engel , det. M. S. Engel’’.

ETYMOLOGY: The specific epithet is a reference to the Baltic region where the amber originates.

Boreallodape mollyae , new species

Figures 53 , 54

Plates 4e, 5a

DIAGNOSIS: This is the smallest species of the genus. Boreallodape mollyae can be recognized by the combination of impunctate pleural integument (unique for the genus) and minute and relatively sparse metasomal punctation.

DESCRIPTION: Female. Total body length 3.68 mm; forewing length 2.34 mm. Head wider than long (length 0.97 mm, width 1.13 mm). Upper interorbital distance 0.65 mm; lower interorbital distance 0.50 mm. Interocellar distance 0.18 mm; ocellocular distance 0.17 mm; median ocellus to lateral ocellus 0.08 mm. Intertegular distance 0.77 mm. Basal vein distad cu­a by two times vein width; second abscissa Rs basad 1m­cu by four times vein width; 2rs­m relatively straight, distad 2m­cu by two times vein width; first submarginal cell longer than second submarginal cell.

Labrum with small punctures separated by 1–3 times a puncture width, integument between smooth. Clypeus with small punctures separated by 2–3 times a puncture width. Supraclypeal area sculptured as on clypeus. Remainder of face with sparse, small punctures, integument between smooth, punctures becoming gradually more closely spaced again (separated by 2–4 times a puncture width) on upper part of face and vertex, integument between smooth. Gena with minute punctures separated by 3–4 times a puncture width, integument between smooth; postgena with small punctures separated by 1–2 times a puncture width, integument between smooth. Pronotum impunctate, faintly imbricate. Mesoscutum with small punctures separated by

MATERIAL: Six specimens. Holotype. Female, B­JH 81 ( AMNH) labeled: ‘‘Baltic amber: Eocene, Kaliningrad, Yantarny’’ // ‘‘ Holotype, Boreallodape mollyae Engel’’.

Paratypes. Five females, Nr. 19948 ( ZMPA) labeled: ‘‘Muzeum Ziemi w Warszawie, 19948, Baltic amber with bees, Apidae , from Baltic beach in Stupsk, 1983’’ // ‘‘Baltic Amber: Eocene, Nr. 19948, Muzeum Ziemi Pan, M. S. Engel study’’ // ‘‘ Paratype, Boreallodape mollyae Engel’’.

ETYMOLOGY: The specific epithet is a patronymic in loving honor of Ms. Molly G. Rightmyer, brilliant hymenopterist and gifted artist, who executed the numerous magnificent illustrations presented herein.

a puncture width, integument between smooth. Tegula with minute punctures, punctures separated by 1–2 times a puncture width. Scutellum sculptured as on mesoscutum. Metanotum with minute punctures separated by 2–3 times a puncture width, integument between smooth. Mesepisternum impunctate and smooth except for a few exceedingly faint punctures sparsely scattered, hypoepimeral area impunctate. Metepisternum impunctate. Propodeum impunctate and smooth. T1–T2 impunctate; T3–T5 with minute punctures separated by 2–3 times a puncture width, integument between smooth; T6 with minute punctures separated by 1–2 times a puncture width, integument between smooth; sterna imbricate.

Where preserved (mesoscutum, scutellum, metasoma) integument dark brown and shining with reddish­brown highlights. Wing membrane hyaline; veins dark brown.

Setae simple, minute or short, and sparse except those of sterna erect, short and more dense.

Boreallodape striebichi , new species

Figures 55–58

Plate 4c,d,f

DIAGNOSIS: This species is most similar to the type species for the genus, B. baltica , but differs in the punctation of the pleura and sculpturing of the propodeum (refer to Diagnosis for B. baltica ).

DESCRIPTION: Female. Total body length 4.54 mm; forewing length 2.91 mm. Head wider than long (length 1.13 mm, width 1.34 mm). Upper interorbital distance 0.84 mm; lower interorbital distance 0.63 mm. Interocellar distance 0.28 mm; ocellocular distance 0.22 mm; median ocellus to lateral ocellus 0.13 mm. Intertegular distance 0.97 mm. Basal vein distad cu­a by two times vein width; second abscissa Rs basad 1m­cu by four times vein width; 2rs­m relatively straight, distad 2m­cu by two times vein width; first submarginal cell longer than second submarginal cell.

Labrum with small punctures separated by 2–4 times a puncture width, integument between smooth. Clypeus with faint, small punctures sparsely separated by 1–3 times a puncture width. Supraclypeal area and face sculptured as on clypeus; punctures becoming more closely packed (separated by less than a puncture width) toward upper part of face and vertex, integument between smooth; small impunctate zone lateral to and bordering lateral ocellus, impunctate zone less than 1OD in width and length. Gena with small punctures separated by less than a puncture width, integument between finely imbricate; postgena sculptured as on gena. Pronotum with small punctures separated by a puncture width or less, integument between finely imbricate. Mesoscutum with small punctures separated by a puncture width, integument between smooth. Tegula with minute, faint punctures on inner two­thirds, punctures separated by two times a puncture width. Scutellum sculptured as on mesoscutum. Metanotum with minute punctures separated by a puncture width or less, integument between smooth. Pleura strongly punctured, punctures separated by less than a puncture width or more often contiguous, hypoepimeral area without impunctate zone, integument between (where evident) smooth. Metepisternum sculptured as on mesepisternum. Basal area of propodeum, metapostnotum, and posterior surface of propodeum imbricate; lateral surface of propodeum with small punctures separated by less than a puncture width, integument between faintly imbricate. First metasomal tergum impunctate; T2 with coarse, faint punctures separated by a puncture width or less except punctures of central disc more widely separated and faint, without impunctate area; remaining terga with coarse, faint punctures separated by a puncture width or less.

Integumental coloration dark brown where preserved. On some individuals yellow markings are easily apparent along the inner margin of the compound eyes below the level of the anterior tentorial pits as well as small areas on the lateral apical borders of the clypeus. Wing membrane hyaline; veins dark brown.

Setae simple, minute or short, and sparse except those of sterna erect, short, and more dense.

MATERIAL: Fourteen specimens. Holotype. Female (pl. 4c, 4d), B­BS 153 ( AMNH) labeled: ‘‘Baltic amber: Eocene, Kaliningrad, Yantarny’’ // ‘‘ Holotype, Boreallodape striebichi Engel’’. There are several specimens in this single piece (designated as paratypes below). The holotype is the single individual depicted in plate 4c, 4d. There is some pyrrhite on the specimen (e.g., on supraclypeal area) that makes the sculpturing difficult to interpret in some areas.

Paratypes. Eight whole females and five partial females, B­BS 153 ( AMNH): in the same block of amber as the holotype.

ETYMOLOGY: The specific epithet is a patronymic honoring Herr Bernhard Striebich, Buxtehude ( Germany), who generously donated the holotype and its associated paratypes to the AMNH.

COMMENTS: The shape of the clypeus in this species appears to be slightly different from that of other Boreallodape . The lateral margins of the clypeus are not as strongly concave and the portion of the clypeus above the bend in the lateral margins and above the anterior tentorial pits is shorter (thereby the supraclypeal area is correspondingly longer than in the other species). Thus, the clypeus is more plesiomorphic (more closely approximating that shape seen in Manueliini ) than other Boreallodape species. I presently interpret this species as the basalmost species of Boreallodape .

Figures

Fig. 48. Right lateral view of holotype female of Boreallodape baltica, new species.

Fig. 49. Frontal view of head of holotype female of Boreallodape baltica, new species. Scale bar = 0.5 mm.

Figs. 50–51. Wings of holotype female of Boreallodape baltica, new species. 50. Forewing. 51. Hind wing. Scale bar = 0.5 mm.

Fig. 52. Claw and arolium of holotype female of Boreallodape baltica, new species. Scale bar = 0.25 mm.

Fig. 53. Dorsal view of holotype female of Boreallodape mollyae, new species.

Fig. 54. Frontoventral oblique view of head of holotype female of Boreallodape mollyae, new species. Scale bar = 0.5 mm.

Fig. 55. Right dorsolateral habitus of holotype female of Boreallodape striebichi, new species.

Fig. 56. Scanning electron micrograph of paratype female of Boreallodape striebichi, new species; partial specimen preserved at amber surface of B­BS 153 (AMNH).

Fig. 57. Scanning electron micrograph of paratype female of Boreallodape striebichi, new species. Magnified view of prosternum from figure 56.

Fig. 58. Scanning electron micrograph of paratype female of Boreallodape striebichi, new species. Magnified and slightly oblique view of prosternum.