Camponotus chloroticus EMERY, 1897

Ronald M. Clouse, Benjamin D. Blanchard, Rebecca Gibson, Ward C. Wheeler & Milan Janda, 2016, Taxonomic updates for some confusing Micronesian species of Camponotus (Hymenoptera: Formicidae: Formicinae), Myrmecological News 23, pp. 139-152: 144-147

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Camponotus chloroticus EMERY, 1897


Camponotus chloroticus EMERY, 1897 

( Figs. 15 ­ 20View Figs. 11 ­ 16View Figs. 17 ­ 20; Tabs. 2, 3)

Camponotus maculatus ssp. chloroticus EMERY, 1897  .

Combination in Camponotus (Myrmoturba), as Camponotus (Myrmoturba) maculatus chlorotica var. chlorogaster  : EMERY, 1914.

Camponotus (Myrmoturba) maculatus pallidus var. samoensis  SANTSCHI, 1919, unavailable name. Homonym of Camponotus irritans samoensis (SMITH, 1857).

Camponotus (Myrmoturba) maculatus ssp. sanctae crucis MANN, 1919.

Subspecies of Camponotus irritans: EMERY 1920.

Combination in Camponotus (Tanaemyrmex): EMERY 1925.

Subspecies of Camponotus irritans: KARAVAIEV 1933.

Raised to species: WILSON& TAYLOR 1967.

Comments: Camponotus chloroticus  was originally de­

scribed by EMERY (1897) as a subspecies of C. macula­

tus, as follows:"I bought from Godeffroy Museum[Hamburg, 1861 ­ 1885] specimens of this form from the Tonga Islands and New Britain, under the name C. pallidus. … For the shape of the various parts of the body, for the pubescence, the very weak sculpture and the hairs, it is very close to the C. Kubaryi, MAYR[specific epithet capitalized in original], particularly the oceanic specimens and those from New Guinea. … Maximum size is 8 mm; reddish­yellow, dirt­like color; head darker and more red, abdomen more or less blackish in its rear."

We do not know which aspects of the pilosity EMERY noticed as being similar to that of Camponotus kubaryi stat. rev., but the presence of standing hairs on the proximal hind femur and on the propleuron in both species is one of the few readily discernable synapomorphies of an important clade of Camponotus in the Pacific and one of the key characters used to distinguish C. chloroticus  from C. micronesicus  . Using this pilosity character, overall similarity in size, shape, and coloration, as well as our finding of only one such yellow Camponotus species in the same islands, we confirm here that the Tongan syntypes of C. chloroticus  ( Figs. 15, 16View Figs. 11 ­ 16) match the species in Clade IV, which extends from New Guinea to Polynesia ( Fig. 2).

The Camponotus chloroticus  syntype from Irupara, New Guinea ( Figs. 17 ­ 20View Figs. 17 ­ 20), is not as clearly aligned with the Tongan syntypes or modern specimens from the Polynesian, Fijian, and Melanesian clade, partially due to its mounting, which limits our view of the important pilosity characters. However, the New Guinean syntype has distinctly shorter scapes than almost all C. micronesicus  sp.n. specimens measured, measuring just at the lower limit of the range, and producing a scape index for the New Guinea syntype that is smaller than all C. micronesicus  specimens measured but within the range for C. chloroticus  . The petiole length of the New Guinean syntype is also similar to that of C. chloroticus  specimens, and altogether we have more support for it being C. chloroticus  than C. micronesicus  sp.n. Other options for the identity of the New Guinean syntype include an undescribed from, or, if it is truly missing the hind femur and propleuron standing hairs, an oddly concolorous C. humilior (which tends to be bicolorous); C. novaehollandiae is too large, also usually bicolorous, and, from our PCA analysis, slightly different in shape.

To the original description we add a summary of our morphological observations of this species, combining syntypes and modern specimens, as follows (also see Tabs. 2, 3). Majors: EL 0.48 (range 0.40 ­ 0.51), EW 0.36 (0.25 ­ 0.40), FCL 1.14 (1.00 ­ 1.31), HL 2.22 (1.8 5 ­ 2.40), HW 2.00 (1.45 ­ 2.25), ML 2.69 (2.38 ­ 2.85), MTL 1.68 (1.44 ­ 2.10), PH 0.74 (0.59 ­ 0.81), PL 0.58 (0.43 ­ 0.75), SL 1.65 (1.44 ­ 1.85); CI 90 (78 ­ 9 5), SI 83 (73 ­ 124). Mesosoma light yellow, gaster same color as mesosoma or slightly darker, head color usually darker than mesosoma; head tapering, vertex usually slightly concave; hind femur and propleuron with standing hairs. Minors: EL 0.42 (0.38 ­ 0.55), EW 0.33 (0.30 ­ 0.40), FCL 1.0 4 (0.90 ­ 1.40), HL 1.66 (1.55 ­ 2.10), HW 1.28 (1.18 ­

1.60), ML 2.39 (2.20 ­ 3.05), MTL 1.58 (1.31 ­ 1.95), PH

0.62 (0.50 ­ 0.75), PL 0.57 (0.50 ­ 0.70), SL 1.80 (1.45 ­ 2.45); CI 77 (74 ­ 82), SI 142 (123 ­ 154). Mesosoma usually light yellow, gaster and head usually same color as mesosoma or slightly darker; head tapering, vertex convex and occipital carina present; hind femur and propleuron with standing hairs.














Camponotus chloroticus EMERY, 1897

Ronald M. Clouse, Benjamin D. Blanchard, Rebecca Gibson, Ward C. Wheeler & Milan Janda 2016


chloroticus EMERY, 1897

Emery 1897