Difference between revisions of "Baracidris meketra"

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Latest revision as of 07:30, 28 November 2018

Baracidris meketra
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Solenopsidini
Genus: Baracidris
Species: B. meketra
Binomial name
Baracidris meketra
Bolton, 1981

Baracidris meketra casent0901013 p 1 high.jpg

Baracidris meketra casent0901013 d 1 high.jpg

Specimen Labels

All specimens originated in forest; those from Ghana were extracted from a sample of cocoa leaf litter which had built up between the roots of a large forest tree, left in the plantation to provide shade for the cocoa. (Bolton 1981)

Identification

This species can be recognized by the absence of standing hairs, posterior head margin concave medially and clypeus not produced into a narrow truncated lobe. (Fernández 2003)

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Afrotropical Region: Ghana, Ivory Coast, Nigeria (type locality).


Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Worker

Nomenclature

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

  • meketra. Baracidris meketra Bolton, 1981b: 255, figs. 12, 13 (w.q.) NIGERIA. See also: Fernández, 2003b: 35.

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 1.8, HL 0.44, HW 0.36, CI 82, SL 0.28, SI 78, PW 0.26, AL 0.50.

Mandibles sculptured with fairly large scattered pits, shining, without striate sculpture. Apical tooth of mandible large, the second smaller, the remaining three teeth very small. Anterior clypeal margin projecting forwards medially but not forming a narrow truncated lobe. Structure of clypeus and frontal lobes as given in generic diagnosis. Antennal scapes short and stout (SI 75-79 in entire type-series), when laid back on the head distinctly failing to reach the occipital margin. First funicular segment large, longer than broad; segments 2-9 of funiculus annular and distinctly broader than long. The two apical funicular segments which form the strong club dissimilar in size, the pre apical much shorter than the apical (0.05 as opposed to 0.22). Eye minute, with a single ocellus of diameter c. 0.015-0.020, approximately 0.05 x HW. With head in full-face view the occipital margin indented or slightly concave medially. Promesonotum forming a single long shallow convexity in profile, the metanotal groove impressed. Propodeal dorsum in profile feebly convex and sloping posteriorly to the short but quite broad triangular teeth. The propodeal teeth are joined by a lamella below to the enlarged, strongly prominent and very broadly rounded plate-like metapleural lobes, the two together forming an efficient shield all down the propodeal declivity. Propodeal spiracle round. With alitrunk in dorsal view the promesonotum three times longer than the propodeum (0.32 and 0.10 respectively), the pronotal shoulders broadly rounded. Propodeal dorsum terminating posteriorly in a sharply defined arch between the bases of the laterally flattened teeth, the declivity almost vertical and bounded on each side by the very prominent teeth and metapleural lobes, and the lamella which links them. A single small carina traverses the declivity at the level of the propodeal teeth. Petiole in profile with a short, thick anterior peduncle which is distinctly shorter than the length of the node; the peduncle with a small anteroventral process. Postpetiole in profile with the sternite produced into a large truncated ventral process. In dorsal view the petiole node as long as broad (c. 0.12), the anterior peduncle broader than long and much shorter than the dorsal length of the node; the node itself scarcely broader than the peduncle. Postpetiole dorsally slightly broader than long, about equal in length to the petiole node and parallel-sided, appearing short-cylindrical. Base of first gastral tergite concave at the postpetiolar articulation. Dorsum and sides of head with small, close-packed foveolate punctures, the spaces between which are smooth and shining. Spaces between punctures usually smaller than the diameter of the punctures. On the sides of the head above and behind the eyes there is a tendency for the punctures to be aligned. Dorsal alitrunk similarly sculptured but the punctures less conspicuous and more widely scattered, with extensive smooth shining spaces between them. Sides of alitrunk and all surfaces of pedicel segments punctate, denser on the metapleuron than elsewhere on the alitrunk and denser on the sides of the petiole and postpetiole than dorsally. First gastral tergite unsculptured except for scattered minute punctulae. Hairs absent except on clypeus, mouthparts and gastral apex. All dorsal surfaces of head and body thinly and sparsely clothed with extremely fine short appressed pubescence. Colour uniform light brown, the appendages lighter in shade than the body.

Paratypes. TL 1.7-1.8, HL 0.44-0.47, HW 0.36-0.38, CI 80-82, SL 0.27-0.30, SI 75-79, PW 0.26-0.28, AL 0.49-0.50 (4 measured). As holotype but the Ghana specimens slightly darker in colour than those from Nigeria and with the cephalic sculpture somewhat more sharply defined. Propodeal teeth vary slightly in length and width but are always shorter than the metapleural lobes. One or two fine transverse carinae may be present on the propodeal declivity, between the teeth.

Queen

Paratype. (dealate). TL 2.0, HL 0.46, HW 0.39, CI 85, SL 0.28, SI 72, PW 0.30, AL 0.56. As worker but eyes larger (maximum diameter 0.10, c. 0.26 x HW) and with ocelli present. Alitrunk with full complement of flight sclerites, the pronotum forming a clearly visible collar anteriorly in dorsal view. Mesoscutellum much higher than and somewhat overhanging the propodeal dorsum. Mesoscutum and scutellum with foveolate punctures and a smooth unsculptured median longitudinal strip; otherwise as holotype.

Type Material

Holotype worker, Nigeria: Ile-Ife, 21.vii.1971 (J. T. Medler) (The Natural History Museum). Paratypes. Nigeria: 1 worker with same data as holotype. Ghana: 1 worker and 1 dealate female, Tafo, 4.ix.1970, cocoa litter sample (B. Bolton). Ivory Coast: 1 worker, Abidjan, Banco Forest, i.1963 (W. L. Brown) (BMNH; Museum of Comparative Zoology).

References