Comprehensive Description

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The Basicerotini shares the following synapomorphies with the other members of the dacetine tribe group (Bolton 2003):
  • Head anterior to antennnal sockets strongly narrowed from side to side
  • Masticatory margins of mandibles oppose but do not overlap when mandibles fully closed
  • Trigger hairs on labrum or mandible
  • Specialized labral shape
  • Preocular carina present

In addition, the tribe has the following apomorphies:

  • Labrum with a deeply incised transverse groove across entire width, distal of hinge with clypeus
  • Dorsal torulus lobe hypertrophied and strongly curved downward, plane of movement of basal scape neck very restricted
  • Base of scape passes through two right-angled bends (not in the same plane)
  • Helcium arises from base of a broad and deeply concave depression in anterior surface of abdominal segment III
  • Tergite and sternite of abdominal segment IV transversely marginate basally, with dense, sharply incised, separated punctures


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