Monomorium dakarense

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Monomorium dakarense
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Solenopsidini
Genus: Monomorium
Species: M. dakarense
Binomial name
Monomorium dakarense
Santschi, 1914

Monomorium dakarense casent0913570 p 1 high.jpg

Monomorium dakarense casent0913570 d 1 high.jpg

Specimen Labels

Nothing is known about the biology of Monomorium dakarense.

Identification

Bolton (1987) - Associated with bicolor until the present, dakarense is best regarded as a distinct species. Apparently it was linked to Monomorium bicolor by Santschi (1914c) purely on the grounds of their similar colour, but he separated them by saying that in dakarense the scape was shorter and the psammophore better developed. The scape is indeed shorter in dakarense (SI 95-100) than in bicolor (SI 104-115), but also the former is considerably smaller (compare the measurements above with bicolor HL 0.70-0.93, HW 0.52-0.75, SL 0.56-0.78). The cephalic sculpture of bicolor is composed of sharply defined reticulate-punctation everywhere, and the first gastral tergite is less densely hairy.

M. dakarense is separated from its immediate allies by combining the distinctive colour scheme of the bicolor-complex with a lack of the reticulate-punctate cephalic sculpture usually associated with that colour scheme, replacing it by the silky punctulate-shagreenate sculpture generally associated with Monomorium sutu and its close relatives in the australe-complex. It is thus difficult to decide if dakarense is a member of the bicolor-complex (because of its colour) which has independently acquired the cephalic sculpture typical of sutu and allies, or if it is a member of the australe-complex which has acquired the bicolor-complex colour scheme. For the present I incline towards the latter as dakarense seems closer morphologically to Monomorium opacior, Monomorium parvinode and Monomorium minor than it does to any member of the bicolor-complex.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Afrotropical Region: Senegal (type locality).

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Castes

Nomenclature

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

  • dakarense. Monomorium bicolor st. dakarense Santschi, 1914d: 353 (diagnosis in key) (w.) SENEGAL. Subspecies of subopacum: Santschi, 1927d: 245. Raised to species: Bolton, 1987: 339.

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

Description

Worker

Bolton (1987) - TL 2.2-2.3, HL 0.57-0.59, HW 0.44-0.47, CI 77-80, SL 0.44-0.45, SI 95-100, PW 0.30-0.31, AL 0.66-0.70 (3 measured).

Maximum diameter of eye 0.23-0.24 x HW, with 7-8 ommatidia in the longest row. Distribution of pilosity as in bicolor but first gastral tergite with numerous standing hairs in front of the apical transverse row. Head under low magnification appearing uniformly finely granular; under higher magnification the entire dorsum opaque, very finely and densely punctulate-shagreenate and having a silky appearance. Alitrunk, petiole and postpetiole finely densely reticulate-punctate. First gastral tergite shagreenate. Head and alitrunk orange-yellow to dull orange-brown, the gaster blackish brown, the two colours strongly contrasting.

Type Material

Bolton (1987) - Syntype workers, Senegal: Longa (Roubaud) (Naturhistorisches Museum, Basel) [examined].

References