| Proceratium colombicum|
De Andrade, 2003
Nothing is known about the biology of Proceratium colombicum.
A member of the micrommatum clade. Differing from Proceratium brasiliense and Proceratium catio, in the worker, by the following set of characters: head, mesosoma, petiole and postpetiole covered by dense granulation instead of granulate-rugulose foveolate, and first gastral tergite entirely densely granulate instead of densely granulate after the curvature only. (Baroni Urbani and de Andrade 2003)
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Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
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Very little is known about the biology of Proceratium ants. They nest in soil, rotten wood, under deep-set stones and, in a few cases, tree branches. For many species the nest consists of small rounded chambers hollowed out of soft rotten wood or in the soil. Toward the cooler limits of the range, particularly in North America, nests and foraging workers are found under deep set rocks instead of in rotten wood. The nest site is usually in forest shade, in old moist gardens, or similar habitats that are constantly moist. Some species of known to be egg predators of arthropods, especially of spiders.
Most Proceratium are relatively rare but this is not the full explanation for why they are not commonly collected. Colonies of most species are small. Based on anectdotal natural history information from a few species, it was once thought that most Proceratium would likely be found to have mature colonies that contain somewhere between 10 - 50 workers. Yet nests with more than 50, and in some cases up to 200, workers have been been reported. Besides small colonies, these ants also do not appear to forage in places where they are readily encountered.
Males and females are though to be produced in small numbers but we generally do not have enough data for colonies of any species to know what might be typical. Reproductive flights have been observered toward the end of the summer in some northern temperate areas. In these regions the nuptial flight occurs during the last half of August. Both sexes climb some distance from the nest entrance before taking flight. Workers too issue from the nest during the nuptial flight, as is often the case with otherwise cryptobiotic ants.
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- colombicum. Proceratium colombicum De Andrade, in Baroni Urbani & De Andrade, 2003b: 131, figs. 60, 61 (w.) COLOMBIA.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Head longer than broad; its sides slightly narrower anteriorly than posteriorly. Vertex in full face view convex. Clypeus recognizable as a small triangular or subtriangular tooth between the antennal sockets. Frontal carinae close to each other, not covering the antennal insertions. Frontal area behind the frontal carinae weakly convex. Lateral expansions of the frontal carinae relatively narrow, raised and diverging posteriorly. Genal carinae strongly marked. Sulcus between the genal carinae and the gular area impressed. Eyes present, composed by a clearly convex facet slightly below the midline of the head. Ocelli absent. Scapes thicker in the distal half and far short of the vertexal margin. First funicular joint 113 longer than broad. Funicular joints 2-10 broader than long. Last funicular joint as long as the sun1 of joints 7-10. Mandibles with 3 denticles before the apical tooth. Palp formula 3,2.
Mesosoma slightly elongate. Promesopleural and mesometapleural sutures impressed on the ventral half only. Basal face of the propodeum with a semitransparent tumulus medially; area behind the propodeal tumulus short, and resembling a transversal sulcus, the sulcus more concave medially and postero-laterally carinate. Declivous face of the propodeum flat, its sides crenulate and sub-convex close to the propodeal lobes. Propodeal lobes truncate. Propodeal spiracles tumuliform.
Petiole slightly longer than broad, with the sides subparallel in the anterior third and convex posteriorly in dorsal view. Anterior border of the petiole straight, carinate and slightly denticulate on each side. Ventral process of the petiole very small and subtriangular. Postpetiole slightly shorter than 1/2 of the length of the gastral tergite I (LT4 with convex sides), in dorsal view. Postpetiolar dorsum with a median, short tumulus close to the posterior border. Postpetiolar sternite anteromedially with a marked subround projection. Posterior half of the postpetiolar sternite slightly convex. Constriction between postpetiole and gastral segment I strongly impressed. Gastral tergite I weakly inflate dorsally and with broad, round curvature. Gastral sternite I very short medially, carinate and protruding anteriorly on the sides. Remaining gastral tergites and sternites curved ventrally.
Legs slightly elongate. Mid tibiae without spur. Spurs of fore legs without basal spine. Fore basitarsi longer than the mid ones. Hind basitarsi about 1/4 shorter than hind tibiae. Second tarsomere of mid and hind legs longer than third and fourth tarsomeres, and shorter than pretarsus. Pretarsal claws simple. Arolia small.
Sculpture. Head, mesosoma, petiole, postpetiole and gaster strongly granulate. Legs granulo-punctate.
Body covered by hairs of three main types: (1) short, dense, subdecumbent on the whole body, very dense on the tumulus of the basal face of the propodeum, sparse and erect on the funicular joints; (2) long, erect or suberect and sparse on the whole body, absent from the tumulus of the basal face of the propodeum and on the antennae, slightly longer on the petiole, postpetiole and on the gaster; (3) shorter than hair type (1), dense, subdecumbent or appressed on the funicular joints only. In addition the funicular joints bear whitish, thick, appressed, short, sparse hairs, and the scapes with sparse hairs similar to type (2) but shorter.
Colour light ferrugineous-brown with slightly lighter antennae and legs.
Measurements in mm and Indices: TL 2.82; HL 0.65; HW 0.57; EL 0.05; SL 0.42; WL 0.80; PeL 0.29; PeW 0.25; HFeL 0.47; HTiL 0.39; HBaL 0.28; LS4 0.14; LT4 0.64; CI 87.7; S164.6; IGR 0.22.
Holotype worker (unique) from Colombia labelled: "Narino, Orito, Territorio Kofan, 00°30' N 77°13' W, 1000 m, 25.IX 1998, E. L. Gonzales", rn Humboldt Institute.
“Colombicum” is a neologism indicating the provenance of this species from Colombia.
Baroni Urbani, C., de Andrade, M.L. 2003. The ant genus Proceratium in the extant and fossil record (Hymenoptera: Formicidae). Museo Regionale di Scienze Naturali, Monografie, 36, 1–492. (page 131, figs. 60, 61 worker described)