Ceratina dupla

Small Carpenter Bee
Ceratina dupla

NOTE: There is controversy on the status of C. mikmaqi. GenBank https://www.ncbi.nlm.nih.gov/genbank/ part of the National Center for Biotechnology Information (USA) is the top authority for the genetic sequence database for DNA, and it has either removed (as designation “record removed”) or transferred C. mikmaqi specimens to Ceratina dupla.

BOLD (Barcode of Life Database) in Guelph, Ontario has also removed some C. mikmaqi specimens, including the type specimens designated by Sheffield

Small Carpenter Bee Ceratina dupla male on Basket of Gold (exotic). May 07, 2011, Wheatley, Ontario.
Small Carpenter Bee Ceratina dupla male on Basket of Gold (exotic). May 07, 2011, Wheatley, Ontario.

from Nova Scotia (Holotype #02-NS-1619 and Allotype #sheffT-58) are now listed as Ceratina dupla. The 127  remaining specimens listed as C. mikmaqi on BOLD (ver. 4) have all been given a ‘record removed’ status at GenBank. For more information, see my notes under Ceratina mikmaqi.

Identification:
Female:
Head: Dark blue-green to blackish. Lower face (clypeus) with an oblong, ivory mark in the center. Mandibles dark with 3 teeth.
Antenna: Black.
Thorax: Dark blue-green to blackish. Segment 1 (scutum) rough (deep punctures) more so than C. calcarata. Tubercle on thorax side is half black, half white, the white almost crescent-shaped. White hair covering thorax sides.
Wings: Wing knobs (tegulae) black. Wings very lightly smoky gray-brown, with a blackish tinge (infuscated). Wings are darker than C. calcerata.
Legs: Greenish-black, slightly darker than body. Feet (tarsi) blackish. On front leg, the joint between thigh and shin (knee) is white. Sparsely covered with white hair, more so on hind shin (tibiae).
Abdomen: Dark blue-green to blackish. Segments 1 and 2 somewhat shiny, 3 to end dull and faintly covered with very short white hair. Hair is visible on lower abdomen, but not visible on C. calcerata. Tip pointed, no tuft of hair.

Male:
Head: Dark blue-green to blackish. Lower part of face (clypeus) ivory, a 3-cornered mark (hat-like).
Antenna: Brown.
Thorax: Dark blue-green to blackish. Tubercle on thorax side is half black, half white, the white almost crescent-shaped. White hair covering thorax sides.
Wings: Wing knob (tegulae) dark brown. Wings very lightly smoky gray-brown, with a blackish tinge (infuscated). Wings are darker than C. calcerata.
Legs: Greenish-black. Hind thighs (femora) have small projection on underside near the base, barely noticeable. On front leg, the joint between thigh and shin (knee) is white. Feet (tarsi) brownish. Legs covered with very short white hair, more so on hind shin (tibiae).
Abdomen: Dark blue-green to blackish, dull and covered with very short white hair. Tip well rounded.

Similar Species:  Ceratina calcarata male has hind thigh (femora) triangular, point on underside; female usually has no white mark on face. Ceratina strenua male and female have white streak on front leg.

Size: Female 6 to 8 mm. Male 6 to 7 mm.

Habitat: Meadows, forest edges.

Food: Flower nectar

Flight Time: April to October

Life Cycle: Females build provisioned cells in unlined twigs and stems like raspberry and teasel. Nest may have another female in attendance.  After eggs are laid, female stands guard at nest entrance. May have second brood in late July, early August.
Parasites: Wasps Baryscapus americana, Eupelmus vesicularis, Axima zabriskiei; Ichneumon Wasp Hoplocryptus zoesmairi; Mite Pyemotes species.

Comments: Essex County – Point Pelee, Ojibway Prairies. Kent County – Rondeau Provincial Park; widespread across Ontario.

For information on synonyms, references and type specimens see next page