Genus Occasitermes · 西部白蚁属
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Distribution map
About the genus
This genus belongs to the family Termitidae 白蚁科, in the subfamily Nasutitermitinae 象白蚁亚科; the site records 2 species.
Type species: Occasitermes occasus.
This page includes a distribution map for the genus (GBIF records aggregated on a 1° grid); open a species entry to see its type locality, distribution, and references.
Etymology
Etymology uncertain (perhaps Latin occasus 'setting, west'); -termes from Latin termes.
The etymologies in this section are analytical breakdowns; the roots follow Brown (1956).
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
Among Holmgren's subgenera of Eutermes, the soldier is characterised by the combination of mandibles entirely without an apical process, a long and thick nasus, 12-segmented antennae, and a head capsule not constricted behind the antennal sockets; Eutermellus of the same group has only a weak constriction behind the antennal sockets and can be separated further by head and nasus shape. In the key the alate falls in the Subulitermes group: 1st tooth of the left mandible distinctly larger than the 2nd, fontanelle about at the middle of the head, antennal segments relatively long, pronotum narrow. In his systematic discussion Holmgren points out in particular that the alate belongs to the Subulitermes group while the soldier has a long, thick nasus (similar to that of Rhynchotermes), so he regards the genus as a key member of that branch retaining primitive characters; but what he gives are only key characters, not a complete genus-level description.
Alate
Head broadly oval, usually narrowing anteriorly; fontanelle about at the middle of the head; antennal segments relatively long; pronotum narrow (Taf. III, Fig. 7). The couplets leading to this genus in the key also include: clypeus usually about as long as half its width, or shorter and rather strongly raised, oval, pale yellow; 1st tooth of the left mandible distinctly larger than the 2nd. Wing surface pilosity and venation are not delimited in the key in the original text, only compared through the plate.
Soldier
Mandibles without an apical process; the species are small, antennae 11–12-segmented, 12-segmented in this genus; nasus conical, long and thick; frontal profile straight (compared in the key with Taf. III, Fig. 17); head capsule not constricted behind the antennal sockets.
Sources: Holmgren, N. 1912. Termitenstudien. 3. Systematik der Termiten. Die Familie Termitidae, Isoptera. Kungliga Svenska Vetenskapsakademiens Handlingar, 48(4): 59–62, 68–72., p. 59–60（有翅成虫检索表 B/a/bb/ee/d），p. 60–61（兵蚁检索表 A/aa/b/dd/e），p. 68（系统学讨论） This text is an adaptation, not a verbatim transcription of the original.
Species (2)
Parent level: Checklist index · Nasutitermitinae 象白蚁亚科 · Data & downloads