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This is a member of the micrommatum group and is very similar to micrommatum and panamense (Baroni Urbani and de Andrade 2003). It was synonymized under micrommatum by Brown (1980) and resurrected by Baroni Urbani and de Andrade.
Baroni Urbani, C., and M. L. de Andrade. 2003. The ant genus Proceratium in the extant and fossil record (Hymenoptera: Formicidae). Museo Regionale di Scienze Naturali-Torino, Torino, Italy.
Borgmeier, T. 1957. Myrmecologische Studien, I. Ann. Acad. Brasil. Cienc. 29:103-128.
Brown, W. L., Jr. 1980 ("1979"). A remarkable new species ofProceratium, with dietary and other notes on the genus (Hymenoptera:Formicidae). Psyche (Camb.) 86:337-346.
Earlier (Brown 1974:82) I called attention to the doubtful status of P. convexicepsHNS Borgmeier (1957:120-122, fig. 34). Not only do samples of this complex (including new collections from Honduras: Lancetilla, near Tela; and 14 km S. La Ceiba; both in rotten logs, W. L. Brown, Jr.) vary in the development of the median clypeal process, which may be absent, weakly projecting, or strong, but it seems clear that the "Arbeiter" of micrommatumHNS against which Borgmeier (1957:118-120) compared convexicepsHNS was actually an ergatoid queen of micrommatumHNS, so that differences in head shape, eye size and petiolar thickness are apparently only allometric caste differences.
A worker specimen of P. micrommatumHNS from Honduras was dissected and proved to have maxillary palpi of 3 segments, the second segment having the "hammer-head" form characteristic of ProceratiumHNS, i.e., it is stalked from the side, and the apical segment has 3 long apical sensilla. Labial palpi with each 2 segments: basal segment narrower, apical segment claviform, with 3 long apical sensilla.
Found most commonly in these habitats: 17 times found in cloud forest, 12 times found in riparian forest, cloud forest along stream, near dairy farm pasture, 2nd growth or disturbed primary, 11 times found in montane wet forest, 10 times found in cloud forest edge, near dairy farm pasture, some big trees in rocky areas, probably disturbed primary or old second growth, on a steep slope, 1 times found in mature dry forest, 3 times found in mature wet forest, 2 times found in cloud forest, probably old second growth, matrix of dense bamboo and more open forest, 2 times found in dry forest, 1 times found in moist forest, 1 times found in 2nd growth forest, ...
Found most commonly in these microhabitats: 47 times ex sifted leaf litter, 4 times Hojarasca, 4 times ex sifted litter from forest floor, 4 times ex sifted leaf litter on ground, 3 times Hojarasca, mature forest, dropping, 1 times in soil, 1 times Hojarasca, second growth, vegetation only about 4m high, climbing steeply, 1 times Hojarasca, pasture edge, 1 times Hojarasca, mature forest, climbing steeply, 1 times Hojarasca, econd growth, level.
Collected most commonly using these methods: 22 times Winkler, 27 times miniWinkler, 11 times Mini Winkler, 6 times maxiWinkler, 1 times search, 1 times Berlese.
Elevations: collected from 20 - 1770 meters, 1244 meters average