Acanthomyrmex concavus

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Acanthomyrmex concavus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Acanthomyrmex
Species: A. concavus
Binomial name
Acanthomyrmex concavus
Moffett, 1986

Acanthomyrmex concavus casent0101061 profile 1.jpg

Acanthomyrmex concavus casent0101061 dorsal 1.jpg

Specimen labels

Specimens have been found in leaf litter from a rainforest and a mature wet forest.

Identification

Moffett (1986) - Minors with head deeply concave dorsad and thus resembling Acanthomyrmex luciolae and Acanthomyrmex basispinosus, except: propodeal spines without a distinct thickened base, strongly directed caudad; mandibles each with a ventral tooth; medial clypeal lobes well-developed, projecting; postpetiole with only two pairs of hairs dorsally. Major worker unknown.

A Sabah specimen has a distinctive, bilobed petiolar node.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Borneo (type locality), Indonesia, Malaysia.

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.

  • concavus. Acanthomyrmex concavus Moffett, 1986c: 80, figs. 39B-C, 44-47 (w.) BORNEO.

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

Description

Worker

Minor. Holotype and single paratype measure HW 1.10, HL 0.90 (CI 122), ML 0.78 to 0.79 (MI 87 to 88), SL 0.90 (SI 82), EL 0.16 to 0.17, HFL 1.00 to 1.03 (FLI 111 to 114; FWI 24) mm. Posterior margin of head deeply concave in dorsal full-face view; head shape similar to A. luciolae, but with lateral margins of head less strongly convex. Head widest above the eyes. Head with rounded foveae having thick walls; dorsally the longest hairs extend 0.10 to 0.12 mm. Scapes short (SI < 90). Clypeal index 140 to 144. Lobe to each side of medial clypeal hair strongly produced, but widely separated from the hair; lateral clypeal hairs in a completely enclosed fovea. Smooth medial area of clypeus not bordered laterally by rugae. Mandibles with a small but distinct ventral tooth.

Spines on trunk virtually straight, with propodeal spines extending more directly caudad than in other species; pronotal spines short, stubby, and lacking conspicuous hairs. Pronotal angle forming a feeble tooth. Sculpture on trunk particularly deeply impressed. Propodeal declivity transversely rugose, and bordered on each side by two adjacent rugae.

Petiolar node rounded, without dorsolateral teeth, so that PWI not measurable. Anterior peduncle of petiole long and narrow, and lacking lateral and sublateral hairs; subpetiolar declivity present. Postpetiole subrectangular, about one third wider than it is long, rounded dorsad and only feebly rugose on sides; with two pairs of hairs dorsally. Femora hairy, and with ventral surfaces distinctly concave; hind femora relatively short (FLI < 120). Color dark orange red, with legs and gaster lighter and more orange.

Type Material

Holotype. Minor worker deposited in The Natural History Museum from Malaysia; Sarawak; 4th Div., Gunung Mulu National Park, RGS Exped., Long Pala, lowland rainforest leaf litter, 19/X/1977 (B. Bolton).

Paratypes. One minor worker, same collection data as holotype (Museum of Comparative Zoology).

Etymology

Name refers to strongly concave posterior margin of head.

References