Meranoplus crassispina

Between the known localities in Central and north-western Australia a wide gap is present, which most likely is due to insufficient collecting.

Identification
Schödl (2007) - This taxon in many respects resembles Meranoplus deserticola and obviously is a sibling. However, the broader frontal carinae, the outline of the dorsal shield and, in particular the distinctly differently structured propodeal spines separate crassispina well from the former.

Distribution based on Regional Taxon Lists
Australasian Region: Australia.

Nomenclature

 * . Meranoplus crassispina Schödl, 2007: 393, figs. 24, 25, 64, 85 (w.) AUSTRALIA (South Australia, Western Australia).
 * Type-material: holotype worker, 13 paratype workers.
 * Type-locality: holotype Australia: South Australia, 5.6 km. SSE Mosquito Camp Dam, Crown Point Stn, 26°09’28’’S, 134°30’49’’E, 20-23.xi.1995, pitfalls, Stony Desert Survey LC05; paratypes: 12 workers with same data, 1 worker 6.8 km. WSW Mosquito Camp Dam, 26°08’44’’S, 134°25’56’’E, 20-23.xi.1995, Stony Desert Survey LC02.
 * Type-depositories: SAMA (holotype); ANIC, NHMW, SAMA (paratypes).
 * Distribution: Australia.

Worker
Holotype. TL 5.60, HL 1.30, HW 1.48, FC 1.23, CS 1.39, SL 0.78, SI1 53, SI2 56, PML 1.13, PW 1.33, PMD 1.50, PMI2 113, ML 1.50, PTLL 0.43, PTLH 0.60, PTDW 0.50, PPLL 0.35, PPLH 0.65, PPI 54, PPDW 0.48, PT/PP 105.26.

Mandible with four teeth. Clypeus carinulate, in full face view bluntly bidentate, scarcely surpassing anterolateral frontal projections. Frontal carinae broad and distinctly sinuately narrowed towards clypeus (FI 120). Head wider than long (CI 113), preoccipital margin very shallowly concave only. Antennal scrobe distinctly surpassing middle of lateral sides of head, glossy with additional distinct transverse carinulae at rear, merging very weakly defined into posterior section of head. Genae and ventrolateral sides of head carinate, preoccipital corners reticulate. Eyes moderately sized (EL 0.28, REL 0.21, with 16 ommatidia in the longest row), situated slightly in front of lateral sides of head, dorsal ocular margin touching ventral scrobal margin. Frons rather evenly longitudinally costulate, head only posteriorly reticulate. Promesonotal shield vaulted, with evenly convex profile, moderately wider than long (PMI 118), lateral sides narrowly translucently margined.

Pronotal margins almost parallel-sided, with distinct indentation at level of promesonotal suture, with the anterior mesonotal projections distinctly defined. Promesonotal shield coarsely rugose, with occasional cross meshes only. Propodeal declivity partly overhung by posterior mesonotal margin. Propodeal spines in relation to body size very long (PSL 0.63), situated high above middle of length of declivity, massively developed, straight, apically acute and distinctly diverging when seen from above.

Petiole in lateral view broadly triangular (PTI 71), with anterior face straight, meeting convex posterior face in a crest. Postpetiole elongately nodiform with a rather large anteroventral tooth.

Gaster entirely microreticulate. Surface covered with evenly distributed pilosity existing of short decumbent and long, more or less erect outstanding stiff hairs.

(n = 4). TL 5.20-5.60, HL 1.28-1.32, HW 1.48-1.50, FC 1.21-1.23, FI 120-122, CI 113-118, CS 1.39-1.40, SL 0.78-0.80, SI1 53, SI2 55-58, PML 1.05-1.25, PW 1.25-1.38, PMI 110-119, PMD 1.43-1.53, PMI2 111-114, ML 1.30-1.50, PSL 0.58-0.65, PTLL 0.38-0.43, PTLH 0.55-0.60, PTI 63-71, PTDW 0.46-0.60, PPLL 0.34-0.43, PPLH 0.6-0.7, PPI 54-61, PPDW 0.45-0.58, PT/PP 103-105, EL 0.27-0.31, REL 0.21-0.24, with 15-18 ommatidia in the longest row.

Type Material
Holotype worker, South Australia: 'S. AUST., 5.6 km SSE Mosquito Camp Dam, Crown Point Stn 26°09'28"S 134°30'49"E \ pitfalls 20.-23.Nov 1995 Stony Desert Survey LC05'. Paratypes. 12 workers, same data as holotype; 1 worker, '6.8 km WSW Mosquito Camp Dam 26°08'44"S 134°25'56"E \ pitfalls 20.-23.Nov 1995 Stony Desert Survey LC02' (, SAMA, ).

Etymology
The name refers to the shape of the propodeal spines.

References based on Global Ant Biodiversity Informatics

 * Andersen A. N. 2006. A systematic overview of Australian species of the myrmicine ant genus Meranoplus F. Smith, 1853. Myrmecologische Nachrichten 8: 157-170.
 * Schödl S. 2007. Revision of Australian Meranoplus: the Meranoplus diversus group. Memoirs of the American Entomological Institute 80: 370-424.