Calyptomyrmex grammus, Shattuck, Steven O., 2011

Shattuck, Steven O., 2011, Revision of the ant genus Calyptomyrmex (Hymenoptera: Formicidae) in South-east Asia and Oceania, Zootaxa 2743, pp. 1-26 : 12-13

Calyptomyrmex grammus sp. n.

( Fig. 8 )

Types. Holotype worker and 8 paratype workers from Mulgrave River Road, 7km WbyS Bellenden Ker, Queensland, 2 April 1984, A. Calder & T. Weir, rainforest (holotype ANIC32-053400, paratypes ANIC32-047438 (4 in ANIC, 2 in BMNH, 2 in MCZC)).

Diagnosis. Hairs on head and body thin (essentially the same width along entire length, or only slightly and gradually expanded distally, and with blunt tips), propodeum armed with short spines, gaster weakly punctate, mesonotum rugo-reticulate, the rugae running longitudinally, petiolar node relatively broad and thin in dorsal view. This species is most similar to ocullatus but can be separated from it by the presence of longitudinal rugae on the mesonotum (these are absent in ocullatus ) and the petiolar node being relatively broad and thin in dorsal view (it is narrower and thicker in ocullatus ).

Worker description. Mandibles delicately striate basally, essentially smooth apically. Eyes small, with 3–4 ommatidia in greatest diameter. Propodeum in lateral view armed with short, broad spines. Propodeal lobes slightly thickened posteriorly. Node of petiole in profile slightly higher than that of postpetiole, both approximately the same volume. In dorsal view the petiolar node similar in width or slightly broader than the postpetiolar node. Head indistinctly rugose, the rugae tending to be longitudinal anteriorly and forming a weak network posteriorly, with the entire surface finely but distinctly punctate, the punctations partially obscuring individual rugae. Mesosoma and petiolar and postpetiolar nodes rugose superimposed over an indistinctly punctate background, the individual rugae wavy and sometimes forming a network, otherwise more or less linear. Gaster finely and indistinctly sculptured, stronger anteriorly and fading slightly posteriorly. Hairs on head and body erect, uniform in diameter or narrowing slightly towards the base, generally with sharply pointed tips. Clypeal fork with enlarged and thin hairs, the thin hairs slightly longer. Colour red-brown, antennae and legs slightly lighter.

Measurements. Worker (n = 5) - CFW 0.10–0.11; CI 94–98; HL 0.71–0.75; HW 0.70–0.73; ML 0.67–0.71; MTL 0.29–0.33; PetI 175–199; PetL 0.15–0.18; PetW 0.30–0.32; PronW 0.50–0.52; SI 58–61; SL 0.41–0.43.

Additional material examined. Australia: Queensland: Graham Range (Monteith,G.) ( ANIC).

Comments. This species has only been encountered a handful of times. It is restricted to Far North Queensland rainforest where it has been collected from leaf litter samples.

Figures

FIGURE 8. Calyptomyrmex grammus (holotype, ANIC 32 - 047438): A. Front of head; B. Side of body; C. Top of body; D. Distribution of material examined.