Prionopelta concenta

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Prionopelta concenta
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Amblyoponinae
Genus: Prionopelta
Species: P. concenta
Binomial name
Prionopelta concenta
(Brown, 1974)

Concoctio concenta casent0004306 profile 1.jpg

Concoctio concenta casent0004306 dorsal 1.jpg

Specimen Label

Brown (1974) speculated, based on morphology and placement in the Amblyoponinae, that this ant is a predator of some member of the arthropodan forest-floor microgenton. Collections have been made from soil under a clove tree, sifted litter of rotten wood and leaf mold, and soil-and-litter berlesate in forest.

Identification

Brown (1974) - Prionopelta concenta differs sharply from other Amblyoponinae, in the form of the mandibles. The 9-merous antennae are also unique, although Fulakora degenerata has only 7 segments in the antennae. The strongly constricted worker trunk, sharply marginate anterior pronotal border, and spurless middle and hind legs are also distinctive characters, not found in this combination in other Amblyoponines. The name refers to the mixture of characters of Amblyopone (now Amblyopone and Stigmatomma) and Typhlomyrmex; the shape of the mandibles and the overall habitus are at first glance like those of the neotropical genus Typhlomyrmex.

Distribution

Known from Gabon and Zanzibar Island (Tanzania).

Distribution based on Regional Taxon Lists

Afrotropical Region: Gabon (type locality), United Republic of Tanzania.

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Males are unknown.

Worker

Queen

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • concenta. Concoctio concenta Brown, 1974d: 30, figs. 1-5 (w.q.) GABON. Combination in Prionopelta: Ward & Fisher, 2016: 691.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

Worker

Holotype: TL 2.2, HL 0.44, HW 0.40 (CI 91), ML 0.11, scape L 0.27, WL 0.62 mm. Generic characters for Concoctio given on Pilot Register of Zoology Card No. 29. Details of body form, sculpture and pilosity shown on this card in figures overleaf; see also habitus figure on Card No. 29. The apparent bicolorous condition in the figures, with trunk darker than head, petiole and gaster, is due to differences in the electron-optical properties of these parts as coated with carbon and gold-palladium.

Of characters not well shown in the figures, but reconstructed from high-magnification scanning electron microscope views, the rounded free lobe of the clypeus bears 5 stumpy teeth shaped like short-toed socks with the toes pointed laterad; median tooth with toe pointed to insect's left. Antennal scapes barely fail to reach posterior border of head when held straight back in full-face view. Legs with fine, only moderately abundant, appressed to decumbent pubescence. Color before coating uniform, light, slightly tawny yellow.

Paratypes (2): TL 2.1-2.2, HL 0.42 (both), HW 0.37-0.38 (CI 88-90), ML 0.10 (both), scape L 0.29 (both), WL 0.65-0.67 mm. The 2 para type workers differ from the holotype in their slightly smaller heads and longer scapes and trunks; scapes just reach posterior border of head in full-face view when held straight back. Also, the paratypes have the posterolateral angles of the petiolar node produced downward and backward toward the anterior face of the gaster. These cornuae are only suggested in the holotype. Otherwise, the specimens are similar to the holotype, but the anterior clypeal border could not be clearly seen in the paratypes.

Queen

dealate: TL 2.3, HL 0.43, HW 0.38 (CI 89), ML 0.11, scape L 0.31, WL 0.76 mm. Basic differences from worker cited on Card No. 29. Like the para type workers, with which it was originally collected, but head with more nearly straight sides; compound eyes feebly convex, with more or less 50 facets. Ocelli distinct, the triangle astride a dark median pigment blotch. Color and pilosity as in worker.

Paratype Specimen Labels

Type Material

Holotype (Museum of Comparative Zoology) taken from a soil-and-litter berlesate in forest on the Plateau d'Ipassa, Makokou, Gabon, by M. J. A. Barra of the University of Strasbourg during 1966; M. Barra has my thanks for the interesting material sent from this locality. The 2 worker and one queen paratypes (The Natural History Museum) were taken on Zanzibar Island in soil under a clove tree by R. I. (or R. J.) Robb during 1949, and were sent for my study by Mr. Barry Bolton, to whom I am grateful for the opportunity.

References