Camponotus iwoensis

The holotype and some paratype specimens were collected by Malaise trap.

Identification
Terayama & Kubota (2011) - This species belongs to the subgenus Myrmamblys of the genus Camponotus by the convex anterior clypeal border, 5-toothed mandibles, long antennal scapes, and small body size not exceeding 7 mm in workers. This species is in the minor worker distinguished from the other species in the subgenus by the following characters: 1) dorsal outline of propodeum weakly concave in profile; 2) propodeal declivity below strongly produced posteriorly, anterior half of slope much steep and forming an angle at middle; 3) petiolar scale thick, asymmetrical in profile, anterior margin shorter than posterior margin; 4) first gastral tergum with a pair of brownish elliptical spots and 2nd tergum with a pair of brownish elliptical spots and 2nd tergum with a pair of brownish elliptical spots and 2nd tergum with a pair of brownish oblong spots at anterior portion.

Variation. The spots on the 1st gastral tergum in the paratype workers vary from elliptical to rather oblong, and the maximum diameter from 0.15 to 0.23 mm.

Distribution based on Regional Taxon Lists
Palaearctic Region: Japan.

Nomenclature

 *  iwoensis. Camponotus iwoensis Terayama & Kubota, in Terayama, et al. 2011: 78, figs. 5-8 (w.) JAPAN.

Worker
Holotype. HL 1.03, HW 0.90, SL 0.98, CI 95, SI 108, WL 1.38, PNL 0.15, PH 0.48, DPW 0.35, TL 4.0.

Paratypes (n=5): HL 0.98-1.10, HW 0.85-0.95, SL 0.95-1.17, CI 86-87, SI 118-124, WL 1.38-1.70, PNL 0.14-0.15, PH 0.43-0.48, DPW 0.26-0.29, TL 3.7-4.4.

Holotype. Structure: Head 1.14 times as long as wide, with convex sides and convex posterior margin in full face view. Mandible with 5 teeth. Anterior margin of clypeus moderately convex. Eye 0.25 mm in maximum diameter, weakly protruding. Antenna relatively long; scape exceeding posterior margin of head by 2/5 its length; 2nd segment 2.3 times as long as wide, 3rd and 4th segment 1.5 and 1.6 times as long as wide, respectively.

Pronotal dorsum weakly convex and lower than mesonotal dorsum in profile; in dorsal view, anterolateral corners rounded, 0.38 mm in maximum width; mesonotal dorsum convex in profile; metanotal depression absent. Dorsal outline of propodeum concave in profile; propodeal declivity below strongly produced posteriorly, anterior half of slope much steep and forming an angle at middle. Petiolar scale thick, asymmetrical in profile, anterior margin shorter than posterior margin; in dorsal view, scale 2.3 times as wide as long, with weakly convex anterior margin and straight posterior margin.

Gaster oval, 0.13 mm in maximum width in dorsal view.

Sculpture: Head and antenna microreticulate; mandible largely smooth. Alitrunk microreticulate; microreticulum on pronotum weaker than that on the mesonotum. Petiole smooth. Gaster very weakly microreticulate, and shining. Legs largely smooth.

Pilosity: Head with moderately abundant erect hairs. Pronotal dorsum with 2 pairs of erect hairs at mid length; mesonotal dorsum with 2 pairs of erect hairs, one pair at mid length and other at near posterior end; propodeum with about 20 erect hairs; the longest hair ca. 0.17 mm. Petiolar scale with 4 pairs of erect hairs. Gaster with suberect hairs which are moderately spaced.

Color: Head black; mandible, anterior margin of clypeus and antenna brown. Pronotum and mesopleuron brown; mesonotum and propodeum black. Petiole blackish borwn. Gaster black; 1st gastral tergum with a pair of brownish elliptical spots which are ca 0.20 mm in maximum diameter; 2nd tergum with a pair of brownish oblong spots at anterior portion which are ca 0.35 mm in length. Legs brown excepting trochanters yellowish brown.

Type Material
Holotype. KPM-NK9000002, minor worker, Minami-iwo-to (350 m asl), Ogasawara-mura, Tokyo, 25.vi.2007, H. Karube & K. Matsumoto leg.

Paratypes. KPM-NK9000003, 1 minor workers, same data as holotype; KPM-NK9000004 & KPM-NK9000005, 2 minor workers, Minami-iwo-to (500 m asl - 750 m asl), Ogasawara-mura, Tokyo, 24.vi.2007, H. Karube leg,; uncat., 1 minor workers, same data as holotype; ITLJ uncat., 1 minor worker, same data as KPM-NK9000004 & KPM-NK9000005.

The holotype and some paratypes are deposited in KPM-NK and other paratypes in ITLJ.

Etymology
The specific epithet is based on the name of type of locality, Minami-iwo-to (South Iwo island).

References based on Global Ant Biodiversity Informatics

 * Terayama M., S. Kubota, and K. Eguchi. 2014. Encyclopedia of Japanese ants. Asakura Shoten: Tokyo, 278 pp.