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Species: Tetramorium steinheili   Forel, 1892 

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Taxonomic History (provided by Barry Bolton, 2018)

Tetramorium (Xiphomyrmex) steinheili Forel, 1892l PDF: 520 (w.q.) MADAGASCAR. Malagasy. Primary type information: MADAGASCAR, Forêt d'Andrangoloaka; CASENT0101814; MHNG. AntCat AntWiki HOL

Taxonomic history

See also: Bolton, 1979 PDF: 143; Hita Garcia & Fisher, 2012a: 80 (Lectotype designation).


   (According to curated Geolocale/Taxon lists)
Malagasy Region: Madagascar

Taxonomic Treatment (provided by Plazi)

Treatment Citation: Bolton, B., 1979, The ant tribe Tetramoriini (Hymenoptera: Formicidae). The genus Tetramorium Mayr in the Malagasy region and in the New World., Bulletin of the British Museum (Natural History) Entomology 38, pp. 129-181

Tetramorium steinheili ForelHNS

(Figs 12, 15)

Tetramorium (Xiphomyrmex) steinheili ForelHNS, 1892: 520. Syntype workers, females, Madagascar: Foret d'Andrangoloaka, confins de l'lmerina {Sikora) (MHN, Geneva) [examined].

Worker. TL 4.3 - 4.4, HL 1.00, HW 0.94 - 0.96, CI 94 - 96, SL 0.72 - 0.76, SI 77 - 80, PW 0.68 - 0.72, AL 118 - 1.20 (2 measured).

Mandibles striate; median clypeal carina sharp. Extensions of frontal carinae long and strong, slightly sinuate from origin to behind the level of the eyes and then strongly divergent, directed towards the occipital corners. Pronotum and mesonotum obtusely marginate at the sides, in dorsal view separated by an impression. Metanotal groove absent, not impressed in profile. Propodeal spines long and stout, metapleural lobes elongate-triangular, acute or blunted apically. Petiole node anteroposteriorly compressed, in dorsal view much broader than long. Dorsum of head regularly longitudinally rugulose, the alitrunk more coarsely rugose, predominantly longitudinal but the rugae meandering and with a few crossmeshes present. Pedicel and gaster unsculptured, smooth and shining. All dorsal surfaces of head and body with numerous fine, erect to suberect hairs. Leading (anterior) edges of antennal scapes with short, projecting, suberect to subdecumbent hairs which are shorter than the maximum width of the scape. Colour reddish brown, the gaster paler than the alitrunk.

In overall appearance steinheiliHNS resembles some of the members of the tortuosum-group, but the unsculptured pedicel segments and the fact that the petiole is distinctly anteroposteriorly compressed seem to indicate that the affinities of steinheiliHNS are with humblotiHNS and its relatives. Despite this I feel that there is a distinct possibility that this species may truly be related to andreiHNS and its allies, and convergent upon the weitzeckeri-group in pedicel structure.

Material examined

Madagascar: Andranobe, Route d'Andriamena (A. Peyrieras); Bemanevika, Souspref. Bealanana {A. Peyrieras).

Specimen Habitat Summary

Found most commonly in these habitats: 58 times found in montane rainforest, 28 times found in rainforest, 8 times found in Low altitude rainforest, 2 times found in disturbed gallery montane forest, 1 times found in gallery montane forest, 2 times found in Savannah grassland, 1 times found in park/garden, 1 times found in montane rainforest edge, 1 times found in Foret sclerophylle, 1 times found in disturbed montane rainforest.

Found most commonly in these microhabitats: 29 times sifted litter (leaf mold, rotten wood), 16 times ex rotten log, 5 times ground forager(s), 6 times sifted litter, 4 times under root mat on rock, 3 times ex soil, 2 times ex root mat, ground layer, 1 times under stone, 1 times sifted litter(leaf mold, rotten wood), 1 times on low vegetation, 1 times ex rotten stick on ground, ...

Collected most commonly using these methods: 15 times MW 50 sample transect, 5m, 4 times pitfall trap, PF 50 traps, 11 cm dbh with water, soap, formalin, nonlinear placement, 9 times Malaise, 1 times 10 Maxi Winks, 6 times yellow pan trap, YP 25 trap transect, 5 times pitfall trap, PF 50 tube sample transect, 5m, 2 times MW 25 sample transect, 5m, 4 times 10 MaxiWinks, mixed samples, 1 times 3 MaxiWinks, mixed samples, 2 times Malaise trap, 2 times W 1 large mixed sample, ...

Elevations: collected from 701 - 1984 meters, 1254 meters average

Type specimens: Lectotype of Tetramorium steinheili: casent0101814; paralectotype of Tetramorium steinheili: casent0101257, casent0101258, casent0101566, casent0101801

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