Leptomyrmex melanoticus

Collected in rainforest. Nesting habits are unknown.

Identification
Lucky and Ward (2010) – L. melanoticus is distinctively slender, unicolorous black and virtually hairless. It is unlikely to be confused with the stout and hairy Leptomyrmex flavitarsus, but superficially does resemble Leptomyrmex niger. L. melanoticus can be distinguished from this species by its narrow and conical ‘neck’, an extension of the posterior portion of the head not found in L. niger. The round eyes of L. melanoticus (EL 0.36–0.39) are generally smaller than the large, elongate eyes of L. niger (EL 0.38–0.47 mm). Additionally, the propodeal angle of this species gradu¬ally rounds into the dorsal and posterior faces, in contrast to the distinct angle of the propodeum of L. niger. See the discussion of L. fragilis for consideration of the close relationship between L. melanoticus and L. fragilis. (Lucky and Ward 2010)

Distribution based on Regional Taxon Lists
Indo-Australian Region: New Guinea.

Castes
Queens have yet to be collected.

Nomenclature

 *  melanoticus. Leptomyrmex fragilis subsp. melanoticus Wheeler, W.M. 1934c: 113, fig. 15 (w.m.) NEW GUINEA. Raised to species: Lucky & Ward, 2010: 38. Senior synonym of contractus: Lucky & Ward, 2010: 38.
 * contractus. Leptomyrmex contractus Donisthorpe, 1947c: 586 (w.) NEW GUINEA. Junior synonym of melanoticus: Lucky & Ward, 2010: 38.

Worker
Lucky and Ward (2010) – measurements (n = 6) HL 1.77–2.00, HW 0.99–1.06, MFC 0.18–0.24, IOD 0.56–0.61, SL 3.96–4.54, EL 0.36–0.39, WL 3.32–3.76, PW 0.86–1.01, DPW 0.27–0.35, HTL 4.34–5.09, HTWmin 0.10–0.13, HTWmax 0.15–0.19, CI 0.54–0.56, SI 4.02–4.05, OI 0.11–0.15, HTC 0.62–0.75.

As in Leptomyrmex fragilis, but body unicolorous black with only the antennal funiculi, the mandibles and the tarsi pale yellow.

Male
Lucky and Ward (2010) – measurements (n = 2) HL 1.46–1.52, HW 1.04–1.05, SL 0.37–0.38, EL 0.64, HTL 4.78–4.83, CI 0.68–0.72, SI 0.36–0.37, SI2 1.08–1.09.

Wheeler (1934) - Head without the mandibles nearly twice as long as its width through the eyes, which are unusually large and convex, with feebly sinuate internal orbits and situated distinctly in front of the middle of the head. Cheeks more than half as long as the eyes, concave, converging anteriorly. Postocular borders of head long, very feebly concave, rapidly converging to the short, straight occipital border. Ocelli large but not prominent. Mandibles small and narrow, with pointed tips, their masticatory border without denticles, somewhat longer than the basal border and curving into it without a perceptible angle. Clypeus as long as broad. Antennae very long and slender, fully as long as the body; scapes two and one-half times as long as broad; first funicular joint half as long as the scapes, joint 2 of the same length as the first, succeeding joints much longer, feebly flexuous. Thorax long, mesonotum one and one-half times as long as broad, narrowed anteriorly where it is very convex and strongly overarching the pronotum; mesepisterna very protuberant as in the other species; epinotum low, its base straight in profile, nearly three times as long as the straight, sloping declivity, with which it forms a distinct angle, marked on each side by the projecting epinotal stigma. Petiole from above twice as long as broad, broader behind than in front, with straight sides; in profile without a distinct node, its dorsal and ventral surfaces nearly parallel, the dorsal slightly convex, the ventral straight. Genitalia retracted basally, their appendages exserted and spread; stipites small, subtriangular, longer than broad, with bluntly rounded tip, their ventral border with numerous long cilia; volsella long, flattened, hook-shaped, membraneous at the base where it bears a slender, styliform lacinia; sagittae flattened, subtriangular, with straight dorsal border, rounded tip and convex, serrate ventral border. Legs extremely long and slender, middle tibiae bowed, fore and hind tibiae flexuous, the latter very strongly so. Wings short, measuring only 5 mm.; apterostigmal appendage minute, nodiform; basal half of cubital vein absent.

Lustrous or somewhat shining, very finely shagreened or punctulate.

Hairs and pubescence pale, the former short, absent, except on the stipites, lower surface of petiole and anterior border of clypeus; pubescence rather long, appressed, not very dense, generally distributed. Head, thorax, gaster, dorsal surface of petiole and coxae dark brown; mandibles, clypeus, scapes, front, sutures of thorax, wing-insertions, ventral portion of petiole and genital appendages yellowish brown or brownish yellow; femora paler brown than the coxae, their tips, the tibial, tarsi and funiculi white. Wings distinctly infuscated, with brown veins.

Type Material
Wheeler (1934) - Described from six workers and two males taken by Mr. W. J. Eyerdam at China Straight, New Guinea (Papua).

Lucky and Ward (2010) - Syntypes, 6 workers, 2 males, Papua New Guinea: China Straight (Eyerdam, W.J.). L. contractus Syntype, 1 worker, Papua New Guinea: KB Mission (Krombein, K.V.).

References based on Global Ant Biodiversity Informatics

 * CSIRO Collection
 * Donisthorpe H. 1947. Ants from New Guinea, including new species and a new genus. Annals and Magazine of Natural History (11)13: 577-595.
 * Donisthorpe, Horace. 1941. The Ants of Japen Island, Dutch New Guinea (Hym. Formicidae). The Transactions of the Royal Entomological Society of London. 91(2):51-64.
 * Janda M., G. D. Alpert, M. L. Borowiec, E. P. Economo, P. Klimes, E. Sarnat, and S. O. Shattuck. 2011. Cheklist of ants described and recorded from New Guinea and associated islands. Available on http://www.newguineants.org/. Accessed on 24th Feb. 2011.
 * Lucky A., E. Sarnat, and L. Alonso. 2011. Ants of the Muller Range, Papua New Guinea, Chapter 10. In Richards, S. J. and Gamui, B. G. (editors). 2013. Rapid Biological Assessments of the Nakanai Mountains and the upper Strickland Basin: surveying the biodiversity of Papua New Guineas sublime karst environments. RAP Bulletin of Biological Assessment 60. Conservation International. Arlington, VA.
 * Lucky A., and P. S. Ward. 2010. Taxonomic revision of the ant genus Leptomyrmex Mayr (Hymenoptera: Formicidae). Zootaxa 2688: 1-67.
 * Shattuck S. O. 1994. Taxonomic catalog of the ant subfamilies Aneuretinae and Dolichoderinae (Hymenoptera: Formicidae). University of California Publications in Entomology 112: i-xix, 1-241.
 * Wheeler W. M. 1934. A second revision of the ants of the genus Leptomyrmex Mayr. Bulletin of the Museum of Comparative Zoology 77: 69-118.