Monomorium legulus is known only from southern Western Australia, but may occur elsewhere. I have found this species at Comet Hill trailing on the ground and up and down tree trunks. Several workers were carrying small seeds, which have been identified as Eucalyptus subgenus Symphyomyrtus (Prof. W. T. Clifford, personal communication). Two of these seeds are pinned with the holotype. (Heterick 2001)
Heterick (2009) - Monomorium bihamatum and Monomorium legulus are very similar red species. The latter is distinguished chiefly by a darker band on the mesosoma.
Keys including this Species
- Key to Australian Monomorium Species
- Key to Monomorium of the southwestern Australian Botanical Province
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
Check data from AntWeb
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- legulum. Monomorium legulus Heterick, 2001: 430, figs. 43, 198, 199 (w.) AUSTRALIA.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
Holotype. HML 3.28; HL 1.07; HW 0.99; CeI 92; SL 0.87; SI 88; PW 0.74. Others. HML 2.86-3.95; HL 0.99-1.34; HW 0.82-1.21; CeI 86-100; SL 0.65-0.96; SI 79-93; PW 0.56-0.89 (20 measured).
As for the worker of Monomorium longiceps, but with the following apomorphies.
Head. Frons of head capsule longitudinally striate with combination of incurved decumbent and subdecumbent setulae and erect and suberect setae. (Viewed from front) compound eyes set at midpoint of each side of head capsule; eye large, eye width greater than 1.5x greatest width of antenna! scape. Anteromedial clypeal margin emarginate, median clypeal carinae produced apically as pair of pronounced teeth. Frontal lobes parallel straight. Venter of head capsule with elongate, basket-shaped setae in at least some individuals. Mandibles (viewed from front) triangular and smooth, with piliferous punctures.
Alitrunk. Mesonotal suture absent. Metanotal groove present as feebly impressed furrow between promesonotum and propodeum. Propodeal processes absent (propodeum smoothly rounded in profile or with slight hump at propodeal angle. Propodeal angle absent.
Petiole and postpetiole. Petiolar spiracle lateral and in anterior sector of petiolar node. Petiolar node cuboidal. Height ratio of petiole to postpetiole near 1: 1. Sculpture present in form of microreticulation.
General characters. Colour of head and anterior promesonotum red, or reddish-orange, posterior promesonotum, propodeum, petiole and post- petiole same, heavily infuscated with black, gaster orange, legs brown, variously infuscated, antenna red. Worker caste monomorphic.
Holotype. Worker, Western Australia, Comet Hill, 15.ix.1988, B. E. Heterick, tree-trunk, litter/soil, native veg., rural environ., 432/6MonBH 34 (Australian National Insect Collection). Paratypes. Western Australia: 1 worker, 26 miles NW of Randells, 27.x.1947, T. Greaves, Chelaner (ANIC); 3 workers, Salmon Gums, 70 miles N of Esperance, 7.i.1970, B. B. Lowery, dry sclerophyll, 6 pm, on shrubs and in litter, Chelaner (Museum of Comparative Zoology); 3 workers, Salmon Gums, 7.i.1970, B. B. Lowery, Chelaner (The Natural History Museum).
- Monomorium legulus Heterick, 2001: Holotype, worker, Comet Hill, Western Australia, Australia, Heterick,B.E., ANIC32-015662, Australian National Insect Collection.
- Monomorium legulus Heterick, 2001: Paratype, 1 worker, 26mi. NW Randells, Western Australia, Australia, Australian National Insect Collection.
- Monomorium legulus Heterick, 2001: Paratype, 3 workers, Salmon Gums, 70mi. N Esperance, Western Australia, Australia, The Natural History Museum.
- Monomorium legulus Heterick, 2001: Paratype, 3 workers, Salmon Gums, 70mi. N Esperance, Western Australia, Australia, Museum of Comparative Zoology.
Latin: “collector” [i.e., of small seeds].