Mimozibyne Engel, 2021

Engel, Michael S., 2021, Two new genera of South American Eulonchopriini (Hymenoptera: Colletidae), Journal of Melittology 2021 (107), pp. 1-24 : 16-23

Mimozibyne Engel , new genus

ZooBank: urn:lsid:zoobank.org:act:6B16C2CA-D233-4731-A666-174DD32AFCAF

TYPE SPECIES: Leioproctus (Perditomorpha) eulonchopriodes Michener, 1989 .

DIAGNOSIS: The new genus is similar to Perditomorpha (sensu Moure et al., 1999, but also including most species of Bicolletes Friese in their sense), but can be distinguished most readily by the presence of broad yellow bands on metasomal terga I–V ( Figs. 49 , 51 ), with apical margins raised and carinate ( Fig. 49 ), and the densely and coarsely punctate integument ( Figs. 47–51 , 53 ) (moderately to finely punctate in Perditomorpha). In addition, the middle flagellomeres are broader than long ( Figs. 50 , 53 ), rather than longer than broad as in Perditomorpha.

DESCRIPTION: Moderate-sized bees, approximately 7 mm in length; integument nonmetallic, coarsely punctate and coarsely sculptured (moderately to finely punctate in Perditomorpha); pubescence short to moderate length and typically minutely branched; metasoma without setal bands.

Face weakly convex, supraclypeal area not more protuberant than clypeus; inner orbits of compound eyes converging below; malar space linear; facial fovea absent; vertex convex, not elevated far above upper ocular tangent in facial view; preoccipital ridge rounded; mandible of male with preapical tooth on upper margin; labrum much broader than long with apical margin broadly concave; antenna of male reaching to tegula, flagellomere I slightly longer than broad, longer than flagellomere II, flagellomeres II and III each distinctly broader than long and each much shorter than remaining flagellomeres; middle flagellomeres slightly broader than long (longer than broad in Perditomorpha).

Pronotum without defined posterior dorsal ridge, without carina extending onto lobe; metepisternum deeply impressed, punctured as on remainder of pleura, almost asetose; basal area of propodeum smooth and glabrous, subhorizontal base of propodeum shorter than metanotum (typically longer than metanotum in Perditomorpha).

Inner metatibial spur of male ciliate; metabasitibial plate of male well defined, carinate on all sides, broadly rounded apically, without carina extending along length of metatibia.

Forewing not plaited; 1M slightly distad 1cu-a; pterostigma nearly parallel sided, r-rs arising just distad midlength, border within marginal cell convex; apex of marginal cell narrowly obliquely truncate; two submarginal cells.

Metasomal terga I–V with apical integumental pale yellow and yellow translucent bands in depressed marginal zones, without setal bands; sterna without defined apical setal bands except sternum V with distinct apical fringe (as in Perditomorpha); pygidial plate of male absent; sternum VII of male narrow medially, with two pairs of broad rounded lobes distally; sternum VIII of male large and broad, with broad basal spiculum, and apically with long (about as long as remainder of sternum), broad apical process, with rounded apex (not beveled like a pygidial plate), process slightly downcurved. Genital capsule with distinct broad gonostylus, gonostylus ventromesally partially membranous, with sparse scatered setae, those of membranous region longer; volsella small, with distinct denticles; penis valve simple, downcurved apically.

ETYMOLOGY: The new genus-group name is a combination of the Greek words mîmos (μῖμος, meaning, “imitator”) and zibúnē [ζιβύνη, meaning, “spear”, alternative spelling of sibynē or sibúnē (σιβύνη)]. The gender of the name is feminine.

INCLUDED SPECIES: The genus currently includes only the type species, Mimozibyne eulonchopriodes (Michener) , new combination, from northwestern Argentina (Salta) and Paraguay.

The following couplets, modified from Michener (2007: 138), are provided to incorporate the new genera into the most readily available key to the identification of these South American bees and their many relatives. Note that Lonchorhyncha Michener, Lonchopria Vachal , and Lonchoprella Michener included by Michener (2007) are removed to Lonchopriini ( Engel, 2020a), and Reedapis Michener and Cephalocolletes Michener are removed to Reedapini ( Engel, 2020b) . A summary of those changes is provided by Engel & Gonzalez (in prep.).

1. Metasomal terga I–IV of female and I–V or VI of male with enamel-like apical marginal zones of yellowish, green, bluish, or whitish, these zones usually at least partly impunctate and glabrous ( Figs. 1, 2 , 11, 12 , 14, 16 , 22, 23 , 25, 29–31 , 38, 40–42 , 46 , 49 , 51 , 54, 55 , 59 ) ................................................................................... 2

—. Metasomal terga without enamel-like apical marginal zones, with setae and punctures near apical margins that are concolorous with other parts of terga, or translucent or brownish ............................................................................................ 7

2(1). Punctation coarse and dense, with punctures contiguous or nearly so ( Figs. 1, 2 , 4 , 6, 7 , 11, 12 , 14, 16 , 25, 29–31 , 33–38 , 41–43 , 46–51 , 53 ); metatibial setae of female shorter than metatibial diameter [female of Mimozibyne , n. gen., unknown] ..... 4

—. Punctation not so coarse, moderate to fine and not so dense, with large interspaces among punctures ( Figs. 54, 55 , 57 ); metatibial setae of female variable, but sometimes as long as or longer than metatibial diameter [ Brazil] ................ 3

3(2). Forewing with two submarginal cells; yellow metasomal bands setose; most metatibial setae of female shorter than metatibial diameter; metafemur and metatibia of male unmodified ............................................. Baptonedys Moure et al.

—. Forewing with three submarginal cells ( Fig. 54 ); yellow metasomal bands glabrous ( Figs. 54, 55 , 59 ); many metatibial setae of female as long as or longer than metatibial diameter; metafemur of male crassate, metatibia of male swollen apically ............................................................................................ Nomiocolletes Brèthes

4(2). Preoccipital carina strong, often lamella-like ( Figs. 30–32 , 36, 37 , 41–43 ); pronotum dorsolaterally with strong transverse carina or lamella extending onto pronotal lobe ( Fig. 33 ); pterostigma inside of marginal cell slightly concave to straight [Genus Eulonchopria Brèthes , s.l.] ............................................................... 5

—. Preoccipital and pronotal carinae (or lamellae) absent ( Figs. 1, 2 , 4, 5 , 11, 12 , 22, 23 ); pterostigma inside of marginal cell convex ( Figs. 17, 18 ) .............................. 6

5(4). Facial fovea absent; omaular carina absent (i.e., anterior and lateral surfaces of mesepisternum not separated by carina); axilla simple (e.g., Fig. 7 ); pterostigma inside of marginal cell slightly concave [ Bolivia, Brazil (Santa Catarina)] ............ ............................................................................................... Ethalonchopria Michener

—. Facial fovea distinct; omaular carina present (i.e., anterior and lateral surfaces of mesepisternum separated by carina); axilla angulate ( Fig. 34 ); pterostigma inside of marginal cell straight [ Argentina to USA (Arizona)] ............................... ............................................................................................ Eulonchopria Brèthes , s.str.

6(4). Forewing with three submarginal cells ( Figs. 17, 18 ); metasomal enamel-like bands narrower than median ocellar diameter ( Figs. 1, 2 , 10 ); basal area of propodeum rugose ( Figs. 8 , 14, 16 ); metepisternum transversely striate; metabasitibial plate of male acutely pointed apically ( Figs. 15 , 27 ), with carina extending to metatibial apex ( Fig. 26 ) [southeastern Brazil, Peru] .................................... ...................................................................................................... Apatosigynes , n. gen.

—. Forewing with two submarginal cells ( Fig. 47 ); metasomal enamel-like bands broader than median ocellar diameter ( Figs. 49 , 51 ); basal area of propodeum smooth; metepisternum punctate; metabasitibial plate of male broadly rounded apically ( Fig. 47 ), without longitudinal carina extending along length of metatibia ( Fig. 47 ) [ Argentina (Salta), Paraguay] ................... Mimozibyne , n. gen.

7(1). Labial palpi unremarkable; pretarsal claws with inner rami shorter than outer rami and differently shaped, at least in female, or, rarely, pretarsal claws simple ............................................................................................ Michener (2007) couplet 5

—. Labial palpi enormous, 8–9 mm long, in repose reaching metasomal sterna III or IV; pretarsal claws of both sexes deeply cleft, the two rami similar in shape and of almost equal length [ Brazil] ................................................. Niltonia Moure

Figures

Figures 47–49. Holotype male of Mimozibyne eulonchopriodes (Michener), new combination. 47. Lateral habitus. 48. Facial view. 49. Basal metasomal segments in profile.

Figures 50–51. Holotype male of Mimozibyne eulonchopriodes (Michener), new combination. 50. Dorsal view of mesosoma. 51. Dorsal view of basal metasomal segments.

Figures 52–53. Holotype male of Mimozibyne eulonchopriodes (Michener), new combination. 52. Wing venation. 53. Head and mesosoma in profile.

Figures 1–3. Holotype female of Apatosigynes meloi, new genus and species. 1. Lateral habitus. 2. Dorsal habitus. 3. Facial view.

Figures 11–13. Paratype male of Apatosigynes meloi, new genus and species. 11. Lateral habitus. 12. Dorsal habitus. 13. Facial view.

Figures 14–16. Paratype male of Apatosigynes meloi, new genus and species. 14. Dorsal view of mesoscutellum through propodeum and metasoma. 15. Metabasitibial plate. 16. Basal area of propodeum and metasomal tergum I.

Figures 22–24. Holotype male of Apatosigynes simplicicrus (Michener), new combination. 22. Dorsal habitus. 23. Lateral habitus. 24. Facial view.

Figures 25–29. Holotype male of Apatosigynes simplicicrus (Michener), new combination. 25. Dorsal view of metasoma. 26. Retrolateral view of metatibia (note lengthwise dorsal carina). 27. Metabasitibial plate. 28. Basal area of propodeum. 29. Metasomal tergum I.

Figures 30–32. Paratype female of Eulonchopria (Eulonchopria) punctatissima Michener. 30. Lateral habitus. 31. Dorsal habitus. 32. Facial view.

Figures 38–40. Paratype female of Eulonchopria (Eulonchopria) punctatissima Michener. 38. Dorsal view of metasoma. 39. Metabasitibial plate. 40. Metasomal apex, particularly pygidial plate (note basolateral continuation of plate).

Figures 41–43. Paratype male of Eulonchopria (Eulonchopria) punctatissima Michener. 41. Lateral habitus. 42. Dorsal habitus. 43. Facial view.

Figures 44–46. Paratype male of Eulonchopria (Eulonchopria) punctatissima Michener. 44. Dorsal ridge of metatibia showing carina extending length. 45. Metabasitibial plate and dorsal metatibial carina. 46. Dorsal view of mesosomal apex and metasoma.

Figures 54–56. Female of Nomiocolletes arnaui (Moure). 54. Lateral habitus. 55. Dorsal habitus. 56. Facial view.

Figures 57–59. Female of Nomiocolletes arnaui (Moure). 57. Dorsal view of vertex, mesosoma, and metasomal tergum I. 58. Metabasitibial plate. 59. Metasomal apex, particularly pygidial plate.

Figures 4–5. Holotype female of Apatosigynes meloi, new genus and species. 4. Dorsal oblique view of vertex. 5. Head in profile.

Figures 6–8. Holotype female of Apatosigynes meloi, new genus and species. 6. Mesosomal dorsum. 7. Detail of axilla. 8. Basal area of propodeum.

Figures 33–35. Paratype female of Eulonchopria (Eulonchopria) punctatissima Michener. 33. Dorsal view of head and mesosoma. 34. Detail of axilla (arrow indicates projected angle). 35. Basal area of propodeum.

Figures 36–37. Head of paratype female of Eulonchopria (Eulonchopria) punctatissima Michener (arrows indicate lamellate preoccipital ridge). 36. Oblique dorsal view of vertex. 37. Head in profile.

Figures 17–18. Wing venation of male of species of Apatosigynes, new genus. 17. Forewing and hind wing of Apatosigynes simplicicrus (Michener), new combination. 18. Forewing of A. meloi, new species.

Figures 9–10. Holotype female of Apatosigynes meloi, new genus and species. 9. Metabasitibial plate. 10. Prepygidial fimbria and pygidial plate.