Metapone vincimus

AntWiki - Where Ant Biologists Share Their Knowledge
Jump to navigation Jump to search
Metapone vincimus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Crematogastrini
Genus: Metapone
Species: M. vincimus
Binomial name
Metapone vincimus
Alpert, 2007

Metapone-vincimus-L2.jpg

Metapone-vincimus-D2.jpg

Known from two widely separated locations. In each location, specimens were found in a log with termites.

Identification

Petiolar node from above approximately as wide as long; postpetiolar sternum in side view bluntly rounded.

Taylor and Alpert (2016) - General and diagnostic features as in key (note paired anteromedian clypeal denticles, sub-parallel lateral clypeal margins, petiolar node in dorsal view approximately as wide as long, and unextended postpetiolar sternite). Eyes very small, much as described for Metapone madagascarica. Subpetiolar process more-or-less basic in structure: posterior face approximately equilaterally triangular, subpetiolar angle obtuse, its apex minutely rounded in side view. Subpetiolar extension lamellate, a shallow isosceles triangle, the posterolateral edge slightly concave in side view, the base almost as long as the subpetiolar edge.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Malagasy Region: Madagascar (type locality).

Distribution based on AntMaps

AntMapLegend.png

Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Alpert (2007) - At least two separate M. vincimus colonies were present in the same fallen tree (local Malagasy name “Ompa”). The colonies were separated by over 5 meters along the log and workers attacked and killed members of the other colony when put together into a common foraging arena. Workers and brood were found in chambers just below the log surface in close proximity to Cryptotermes termite chambers. Colony size was small, one colony containing less than 20 workers and about 40 larvae. A queen mesosoma along with worker remains was found in a refuse chamber of this colony. Since queens are known for this species it is probable that after the death of the primary reproductive, the colony is still able to produce workers via the presence of gamergates (Hölldobler et al., 2000b).

Castes

Nomenclature

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

  • vincimus. Metapone vincimus Alpert, 2007: 11, figs. 1, 2, 7, 8, 13, 14 (w.q. and w.-q. intercaste) MADAGASCAR.

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

Description

Worker

Holoytpe; paratypes (n=15): HL 1.20 mm, 1.20–1.44 mm; HW 0.90 mm, 0.90–1.06 mm; ML 1.60 mm, 1.58–1.90 mm; PML 0.90 mm, 0.90–1.24 mm; PMW.64 mm, 0.60–0.76 mm; PNL 0.34 mm, 0.32–0.46 mm; PetW 0.44 mm, 0.44–0.68 mm; PPW 0.46 mm, 0.44–0.62 mm.

Worker

Head in full-face view distinctly longer than broad (CI 0.75 [0.74-0.81]), lateral margins sub-parallel, posterior margin broadly concave. Compound eyes small, reduced to about 6 weakly defined ommatidia, located near the mid-line of the head. Ocellar pits and ocelli absent. Mandibles stout, with 5 rounded teeth, increasing in size progressively towards the mandibular apices. Anterior clypeal margin with a quadrate median lobe formed into a blunt anterior edge (0.10 mm wide). The vertex with a short median suture that extends from the base to the posterior margin. Frontal carinae, widely separated, parallel and forming deep antennal scrobes. The frontal carinae originating from the posterior border of the clypeus, diverging transversely and extending posteriorly to behind the eye. Lateral clypeal lobes narrow, oblique, and separated from the genae by distinct lines continuous with the posterior border of the clypeus. A series of parallel striae begin just below the eye and extend across the posterior border of the lateral clypeal margin.

Antennae 11-segmented, the scape short and flattened dorso-ventrally, SL 0.34 mm, dorsal surface of scape with scattered erect hairs. First segment of funiculus elbowed, segments 2-7 gradually expanding before developing into a flattened, 3-segmented club. Numerous hairs on all surfaces of the funicular segments.

Mesosoma long and narrow, the promesonotum separated from the propodeum by a well- developed, complete, transverse metanotal groove. Entire mesosoma marginate to submarginate laterally, margin becoming more distinct at the propodeal corners. Propodeal dorsum nearly horizontal, passing through an abrupt concave angle to the vertical, posterior face. Petiole weakly convex dorsally. In dorsal view, the anterior margin of the petiolar node straight, the posterior margin deeply concave. Petiole ventrally with a thin, translucent median rounded keel. In profile, the anterior and posterior face of the petiole strongly concave. In profile, postpetiole almost flat dorsally. In dorsal view, anterior margin of postpetiole straight, posterior margin slightly concave, the anterodorsal corners diverging to rounded posterodorsal corners. The postpetiole joined to the gaster by a wide face, although a deep constriction exists between the two segments. Anteroventral surface of postpetiole produced into a pronounced, triangular rounded lobe or blunt tooth in side view.

The first gastric segment almost as long as the remaining gastral segments combined. Gaster with numerous hairs arising from foveae, surface between foveae smooth and shiny. Coxae stout and bulbous. Femora swollen and laterally compressed, the ventral surface longitudinally grooved for the reception of the tibia. Tibia also stout and partly compressed. Protibia armed apically with 1 small spine and a large pectinate spur. Mesotibia with a small, barely pectinate spur, and 3 stout apical teeth. Apical tarsomere on all legs with simple claws.

Sculpture: Clypeus, frons, genae and antennal scrobes covered with fine, longitudinal striae, essentially parallel, but which fade posteriorly, leaving the vertex, occiput and posterior part of the genae smooth and shining, interrupted only by prominent punctures. Centrally two parallel striae forming a groove that extends from the clypeal border to just beyond the limits of the frontal carinae. Entire dorsum of mesosoma longitudinally striate. Dorsal surface of petiole with hair-bearing punctures. Postpetiole and gaster with similar but finer punctures. All areas of the body, including the legs and antennae, smooth and shiny.

Pilosity: Short, scattered, erect yellow hairs on all surfaces of head and mesosoma, many hairs arising from punctures on the vertex, occiput and petiole. Hairs longer on mandibles, anterior margin of the clypeus, lateral surfaces of legs and lower surfaces of petiole and gaster. Pilosity most abundant on postpetiole and gaster.

Color: Head, mandibles and postpetiole dark reddish brown, the mesosoma and gaster a lighter brown. Petiole, legs and antennae light yellowish brown.

Queen

Queen-worker intermorph. Same characters as worker apart from being larger in most dimensions, darker and having relatively larger postpetiole. Ocelli absent.

Queen. Same as worker with the following exceptions: Larger size, additional thoracic sclerites, HL 1.20 mm; HW 0.98 mm; AL 2.20 mm; PW 0.46 mm; PNL 0.44 mm, dealate and uniformly black in color. Three ocelli present and large compound eyes.

Type Material

Holotype worker from MADAGASCAR, 30km N of Antalaha, 3km W to a hill, near Amboangy, 50 m, 14°39’53.3”N, 50°11’26.5”E, 29.VII.2000, secondary rainforest, in log with termite Cryptotermes kirbyi, G. Alpert, P. Rabeson and E. Rajeriarison, #2278. Deposited in Museum of Comparative Zoology. Paratype workers. 15 workers and 1 queen-worker intermorph, collected from the same nest series as the holotype. Alate queen found in same locality on 24.I.1991. Paratypes have been deposited in the following collections; Los Angeles County Museum of Natural History, Los Angeles, California, USA, (Los Angeles County Museum of Natural History); California Academy of Sciences, San Francisco, California, USA, (California Academy of Sciences); Bohart Museum of Entomology, University of California, Davis, California, USA, (University of California, Davis); The Natural History Museum, London, England (The Natural History Museum); Australian National Insect Collection, Canberra, Australia (Australian National Insect Collection); and the National Museum of Natural History, Smithsonian Institution, Washington, D.C., USA, (National Museum of Natural History). Paratypes and voucher specimens including larvae are deposited in the Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts, USA, (MCZC). Cryptotermes termite voucher specimens have been deposited in the American Museum of Natural History, New York, USA, (American Museum of Natural History); the Natural History Museum, London, England (BMNH); and the Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts, USA, (MCZC).

Etymology

The specific name, vincimus = “we succeed”, is in recognition of the joint effort expended in discovering this species. Extremely hard logs were searched by axe for weeks before finally locating the ants and associated termites.

References