Calyptomyrmex grammus

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.

Identification
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 Calyptomyrmex 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).

Nomenclature
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 in, ANIC32-053400, paratypes ANIC32-047438 (4 in , 2 in , 2 in )).

Description
'''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.