Genus Orthognathotermes · 直颚白蚁属

Morphology

The descriptions below are an adaptation of the original genus-level accounts; terms follow the meaning of the source, and the original is not transcribed verbatim.

Diagnostic characters

Alate unknown (nymph with 17-segmented antennae). Soldier: head rectangular, rather flatly convex, frons flat; frontal prominence and fontanelle both absent; above the antennal socket a rather large, rounded-obtuse, tubercle-like widening of the antennal ridge; labrum short, about as long as wide, lingulate but with the lateral angles projecting slightly rounded-obtusely (weakly trilobed); mandibles symmetrical, with a median tooth at the middle; antennae 15-segmented; pronotum saddle-shaped.

Soldier

Head rectangular, rather flatly convex, frons flat; frontal prominence and fontanelle both absent; above the antennal socket a rather large, rounded-obtuse, tubercle-like widening of the antennal ridge. Labrum short, about as long as wide, lingulate, but with the lateral angles projecting slightly rounded-obtusely (weakly trilobed). Mandibles symmetrical; base very wide, passing forwards over a rather long stretch into the middle of the mandible, with a trace of a tooth at the transition between base and middle; mandible slightly geniculate-bent outwards before the midpoint, the bend forming the median tooth; apex curved inwards; upper surface of the right mandibular apex slightly concave. Antennae 15-segmented. Pronotum saddle-shaped.

Worker

Postclypeus about as long as half its width, arched; first mandibular tooth large; antennae 14-segmented.

Sources: Holmgren N. 1912. Termitenstudien. 3. Systematik der Termiten. Die Familie Metatermitidae. Kungliga Svenska Vetenskapsakademiens Handlingar 48(4): 1–166., pp. 118–119（Gattung Orthognathotermes；Imago unbekannt、Soldat、Arbeiter） This text is an adaptation, not a verbatim transcription of the original.