Prionopelta brocha

Other than a few collection habitat notes, little is known about the biology or behavior of this species. It may be interesting to discover its positon within Prionopelta.

Identification
Diagnosis. Distinguished in the worker caste from all other known members of the genus by several apparently primitive characters, including exceptionally large size, strongly developed genal teeth, and Amblyopone-like head shape. Two features of head shape are considered to be more typical of Amblyopone than of Prionopelta - the head is broadest near its anterior end, and the lateral borders are relatively straight. Brocha is thus seen to be a species intermediate in position between the remainder of Prionopelta and the presumably more primitive Amblyopone. It has been placed in Prionopelta primarily because of its mandible form, which is typical for that genus.

Distribution
This taxon was described from New Caledonia.

Biology
A few specimens have been found in leaf litter of primary rainforests.

Description
Holotype worker. HW (exclusive of genal teeth) 0.64 mm, HL 0.79 mm, ML 0.16mm, SL 0.45 mm, CI 81, SI 70, PW 0.43 mm, alitrunk length (maximum) 1.05mm, dorsal petiole width 0.38 mm, petiolar node length (exclusive of ventral lobe) 0.42 mm, width of first gastric tergite 0.52 mm. Head as shown in Figure 7. Remainder of body similar to that of other Prionopelta, including the relatively large majuscula Emery.,

Dorsal surfaces of mandibles finely and longitudinally striolate, and shining. Central portion of clypeus smooth and shining. Remainder of head covered by coarse, contiguous punctures, its surface for the most part completely opaque. Body poterior to the head sparsely punctate, its surface almost entirely feebly shining.

Pilosity very similar to that of most other Prionopelta, including majuscula. Abundant standing hairs present on most body and appendage surfaces, nearly or completely absent from posterior propodeal face, anterior and ventral surfaces of petiolar node, and most of extensor surfaces of legs; everywhere grading into equally abundant, predominantly oblique underlying pubescence.

Body uniformly light ferruginous, appendages clear to very light reddish yellow.

Material examined. NEW CALEDONIA: Mt. Mou, 180 m., December 12, 1954, a single worker (E.O.Wilson). This specimen was collected by means of a Berlese funnel from leaf litter on the floor of dry, semi-deciduous native forest.