Key to Basiceros species

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Key based on Feitosa et al (2007) [1]. Covers all the described species.

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Basiceros

1

  • Occipital margin of head rounded, forming a continuous or nearly continuous raised crest .....2
  • Occipital margin of head trapezoidal or subrectangular, not forming a continuous crest .....3

2

return to couplet #1

  • In full-face view, crest continuous around posterior part of vertex and separated from median convexity of vertex by a broad, uninterrupted sulcus parallel to the crest .....Basiceros militaris
Basiceros militaris casent0280778 p 1 high.jpg
  • Crest medially emarginate and confluent at this point with median convexity of vertex .....Basiceros disciger
Basiceros disciger casent0173734 profile 1.jpg

3

return to couplet #1

  • Mandible subtriangular, strongly bent ventrally and with the outer borders straight basally; anepisternum deeply depressed .....Basiceros scambognathus
Basiceros scambognathus casent0172317 profile 1.jpg
  • Mandible triangular, not strongly bent ventrally, outer borders usually convex basally; mesopleura at the same level as the surrounding surface .....4

4

return to couplet #3

  • Head nearly as broad as long with the occipital lobes rounded; in frontal view, intermandibular space much shorter than the half length of mandibles; gaster with few specialized hairs longer than the basal pilosity .....5
  • Head distinctly longer than broad with the occipital lobes angulated; in frontal view, intermandibular space broad, with about half length of the mandibles; gaster densely covered with specialized hairs longer than the basal pilosity .....6

5

return to couplet #4

  • Petiolar node and postpetiole totally covered with dense pilosity; petiolar node well developed and subrectangular in dorsal view; ventral carina of petiole with many developed teeth of different shapes .....Basiceros conjugans
Basiceros conjugans casent0280779 p 1 high.jpg
  • Petiolar node and postpetiole weakly covered with pilosity; petiolar node subcylindrical in dorsal view to almost obsolete; ventral carina of petiole with a single developed tooth at the anterior portion of peduncle .....Basiceros convexiceps
Basiceros convexiceps casent0904974 p 1 high.jpg

6

return to couplet #4

  • Basal portion of mandibles with dense pilosity formed by whitish squamiform hairs; ventral carina of petiole with a short edge at the anterior portion of peduncle .....Basiceros singularis
Basiceros singularis casent0900940 p 1 high.jpg
  • Basal portion of mandibles smooth and shiny; ventral carina of petiole with a well developed edge at the anterior portion of peduncle, followed by smaller denticles of different shapes .....Basiceros manni
Basiceros manni casent0052769 profile 1.jpg

References

  1. Feitosa, R. M., C. R. F. Brandão and B. H. Dietz. 2007. Basiceros scambognathus (Brown, 1949) n.comb., with the worker and male descriptions, and a revised generic diagnosis (Hymenoptera: Formicidae: Myrmicinae). Papeis Avulsos do Departamento de Zoologia 47(2): 15-26. PDF