Acanthomyrmex basispinosus

Every Ant Tells a Story - And Scientists Explain Their Stories Here
Jump to navigation Jump to search
Acanthomyrmex basispinosus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Acanthomyrmex
Species group: luciolae
Species: A. basispinosus
Binomial name
Acanthomyrmex basispinosus
Moffett, 1986

Acanthomyrmex basispinosus casent0178574 profile 1.jpg

Acanthomyrmex basispinosus casent0178574 dorsal 1.jpg

Specimen labels

The type material was found in rotten wood in a rainforest.

Identification

Moffett (1986) - Propodeal spines of both castes with distinctive widened bases; postpetiole narrow, much wider than long in dorsal view.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

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


Distribution based on AntMaps

AntMapLegend.png

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.

  • basispinosus. Acanthomyrmex basispinosus Moffett, 1986c: 67, figs. 8A, 9-14 (s.w.) INDONESIA (Sulawesi).

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 (HW 1.08) and five minor worker paratypes measure HW 0.98 to 1.13, HL 0.95 to 1.08 (CI 103 to 105), ML 0.18 to 0.19 (MI 72 to 77), SL 1.06 to 1.20 (SI 97 to 115), EL 0.21 to 0.23, HFL 1.28 to 1.39 (FLI 124 to 136; EWI 16 to 17) mm. Head strongly concave across posterior margin in full-face view, and thus similar in shape to Acanthomyrmex luciolae and concavus, except less broad (CI < 120), and lateral margins relatively more convex; widest above eyes. Head with rounded, thick-walled foveae (although foveae near scrobe, on side of head and on vertex with thinner walls, and thus approach the condition described for Acanthomyrmex ferox). Dorsum of head with longest hairs extending about 0.18 mm. As in Acanthomyrmex notabilis, short but conspicuous wide sulcus present mesad between the eyes above the frontal area (traces of such a sulcus present in some A. luciolae, Acanthomyrmex crassispinus and Acanthomyrmex concavus specimens). Clypeal index 102 to 110. Lobe to each side of medial clypeal hair moderately to strongly produced; lateral clypeal hairs in a completely enclosed fovea. Rugum extending back across clypeus from each of these medial clypeal lobes present, though poorly developed. Mandibles lacking a ventral tooth.

Spines on trunk virtually straight. Propodeal spines somewhat longer than those on pronotum; in the two largest specimens (HW for both 1.13 mm) propodeal spines considerably longer, as pronotal spines are very short and stubby. Propodeal spines with a distinctive widened base in profile. Pronotal spines without conspicuous hairs. Pronotal angle abrupt but not forming a feeble tooth. Propodeal declivity bordered on each side by two adjacent rugae, which extend down from base of each propodeal spine (second rugum feeble).

Node of petiole as in figure, without sharp lateral denticles; PWI intermediate (79 to 84). Anterior peduncle of petiole long and narrow, with the lateral hairs present and sublateral hairs lacking; subpetiolar declivity absent. Postpetiole narrow, almost twice as wide as it is long in dorsal view, and with a high, narrow node; thus the postpetiole resembles that of A. notabilis. Femora with scattered hairs, and conspicuously concave beneath; hind femora relatively slender (FWI < 18). Color orange yellow or reddish yellow, legs lighter yellow.

Major. The two paratypes measure HW 2.10 to 2.18, HL 2.17 to 2.24 (CI 97), SL 1.18 (SI 54 to 56), EL 0.28, HFL 1.40 to 1.44 (FLI 64; FWI 16) mm. Foveae on head denser, more deeply impressed, and somewhat larger than in A. crassispina and Acanthomyrmex dusun. Without a distinct cephalic hollow. Long feeble darkly pigmented medial streak dorsad on head; wide medial sulcus conspicuous on frons. Clypeal index larger than in minors: 126 and 139. Forward margin of clypeus lacking a medial projection (but with two feeble, rounded lobes medially). Propodeal spines as described for minor worker.

Type Material

Holotype. Minor worker deposited in Museum of Comparative Zoology from Indonesia: S.E. Sulawesi: 1-2 km east of Wolasi, 42 km south of Kendari, ca. 350 m, rotten wood in rainforest, W-46, 13-14 July 1972 (W. L. Brown, Jr. [examined]). Paratypes. Two majors and five minors, same date and collection number as holotype (MCZ, The Natural History Museum).

Etymology

Name derived from Latin basis + spina, referring to the widened bases of the propodeal spines.

References