Camponotus erythrocephalus

Camponotus erythrocephalus
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Formicinae
Tribe:	Camponotini
Genus:	Camponotus
Species:	C. erythrocephalus
Binomial name
	Camponotus erythrocephalus; Clouse, 2007 Specimen labels

Given that it has only been collected on Yap Island in Micronesia, it appears to be a poor disperser and could easily be an island endemic. (Clouse 2007)

Identification

The flattened petiole, monochromatic reddish anterior and contrasting black gaster appear unique in this species. Among unidentified collections from Borneo, only two species have a resemblance, but the one closest in coloration has a tall petiole, and the one similar in shape is monochromatic black and overall too narrow. (Clouse 2007)

Keys including this Species

Key to Micronesian Ants

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Micronesia (Federated States of) (type locality).

Distribution based on AntMaps

Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.

Biology

Castes

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

erythrocephalus. Camponotus erythrocephalus Clouse, 2007a: 6, pl. 1D-F (w.) MICRONESIA (Yap I.).
- Type-material: holotype worker, 2 paratype workers.
- Type-locality: holotype Micronesia: Yap State, Yap I., Yaptown, Mt Matade, 12.vii.1946, no. 1087 (Townes); paratypes: Yap I., vii.-viii.1950 (Goss)..
- Type-depository: USNM.
- [Also described as new by Clouse, 2007b: 214, misspelled as eryhtrocephalus.]
- Distribution: Micronesia.

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 3.95, HL 1.02, HW 0.95, CI 93, SL 1.30, SI 137, PW 0.73, ML 0.38. Mandible outer margin strongly curving to a sharp apical tooth, the apex parallel to the anterior clypeal margin. (Holotype with material in mandibles, so mandibles and anterior clypeus described below from paratypes.) Median clypeus tapering and dipping away from the vertex centrally, antennal insertions separated from clypeus by a distance slightly more than the distance from nearest clypeal margin to the clypeal midpoint. In front view, head tapering slightly toward the mandibles, vertex rounded, eyes at upper corners. Bottom margin of eyes located above halfway point of the head and slightly above level of the antennal insertions; their inner margin slightly less than halfway from frontal lobes to sides of the head, their outline breaking the outline of the sides of the head. Antennae 12-segmented, the scape extending beyond the vertex by more than half its length. Mesosoma broad and shallow in profile, sloping rather evenly from the anterior pronotum to the posterior propodeum, a slight depression at the metanotal groove and an even slighter one at the promesonotal suture, propodeal declivity distinct but slight. Petiole about 1.5 times longer than tall, its anterior edge rising only about the same distance as the length of the peduncle, then sloping up for a distance slightly less than the height of the posterior edge. Color: Reddish orange head and mesosoma contrasting against a mostly black gaster. Head even in color, mandibles same shade as the remainder of the head. Mesosoma, legs, and petiole same color as head, although coxae slightly darker. Gaster not entirely black but with four grey stripes made by whitish-clear strip along posterior of each gastral tergite; strip is slightly wider than maximum width of the scape. Anterior gastral tergites approach color of mesosoma centrally. Pilosity: Head dominated by recumbent silver hairs interspersed with long, standing hairs on frons and central clypeus. Standing hairs vary in height, but pair closest to vertex as long as maximum width of eyes. Mesosoma with even silver sheen created by recumbent hairs, propodeum with two pairs of long, standing hairs. Petiolar node with four long, backward-pointing hairs arranged in two pairs, one on each side of its highest point; inner hairs slightly shorter than outside ones. Each gastral tergite with about ten long, silver hairs immediately anterior to posterior grey strip. In addition, two adjacent pairs of long hairs lie in line along middle of each tergite. Sculpturing: Head with slight puncturing and body with shallow whorls, but mostly shining.

PARATYPES: TL 4.50–5.15, HL 1.23–1.28, HW 1.03–1.13, CI 81–93, SL 1.37-1.42, SI 121–137, PW 0.82–0.93, ML 0.40–0.47. Five teeth on the masticatory margin visible when the mandibles are closed, declining in size from the apex. Clypeal margin almost straight but curving out slightly. Scapes extending beyond the vertex by a distance less than half their length.

Type Material

Type locality: Yap Island, Yap State, Federated States of Micronesia

Type series: Holotype worker: FSM Yap: Yaptown, Yap I., Mt. Matade (“No. 1087,” Townes, 12-VII-1946, NMNH). Paratype workers (2): FSM Yap: Yap I. (Goss, “Jul–Aug” 1950)

Etymology

Erythrocephalus is Latin for “red-headed,” which is the distinguishing feature of this species.

References

References based on Global Ant Biodiversity Informatics

Clouse R. M. 2007. New ants (Hymenoptera: Formicidae) from Micronesia. Zootaxa 1475: 1-19.
Clouse R. M. 2007. The ants of Micronesia (Hymenoptera: Formicidae). Micronesica 39: 171-295
Clouse, R.M. 2007. The ants of Micronesia (Hymenoptera: Formicidae), Micronesica 39(2): 171-295.