Caenohalictus Cameron

Gonzalez-Vaquero, Rocio Ana & Roig-Alsina, Arturo, 2013, Revision of the species of the bee genus Caenohalictus (Hymenoptera: Halictidae) occurring in Argentinean Patagonia, Zootaxa 3670 (4), pp. 493-515: 495-496

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Caenohalictus Cameron


Caenohalictus Cameron 

Caenohalictus Cameron 1903: 231  . Type species: Caenohalictus trichiothalmus Cameron 1903  , monobasic.

Caenohalictus  is defined among the genera of Caenohalictina by the following combination of characters: Body metallic dark green or blue, sometimes with a reddish tint, rarely black; compound eyes with conspicuous hairs; mesoscutum reticulate ( Fig. 1View FIGURES 1 – 2. 1); dorsal surface of metapostnotum microareolate, finely striate in some species; compound eyes emarginate, inner orbits converging below; female with dark apical band of clypeus extending along the inner orbits, with very inconspicuous punctures, usually reaching the level of the antennal sockets; female with inner hind tibial spur pectinate; male with pygidial plate surrounded by a carina; male genital capsule ventrally concave, gonostylus developed into several processes, directed ventrally.

Gonçalves and Melo (2009) recovered two synapomorphies for the genus: T 1 and T 2 with lateral carinae present ( Fig. 2View FIGURES 1 – 2. 1), also on T 3 in some species, and the male metapostnotum medially depressed. The lateral carinae, probably better described as sulci with slightly elevated margins ( Fig. 2View FIGURES 1 – 2. 1), are present on T 1 and T 2 in Agapostemon chapadensis  , A. nasutus  , A. tyleri  , Pseudagapostemon citricornis  and P. pampeanus  , species that were studied by Gonçalves and Melo (2009), although they reported that the lateral carinae are restricted to T 1 in these species. Gonçalves and Melo (2009) mentioned an S 8 as long as wide as a synapomorphy of Caenohalictina. All the species examined herein had the S 8 much broader than long, in contrast to the species of Caenohalictus  they included. In this light, a revision including all the species of the genus and further studies about the genera related to Caenohalictus  are needed to set new synapomorphies for this genus.

Rojas and Toro (2000) provided detailed descriptions for the species of Caenohalictus  from Chile, as well as descriptions of the main features of the genital capsule of the male. Despite this, the illustrations of the capsules are difficult to interpret, and some steps in the key to the species for the females are hard to follow.












Caenohalictus Cameron

Gonzalez-Vaquero, Rocio Ana & Roig-Alsina, Arturo 2013


Cameron 1903: 231