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Species: Tetramorium zenatum   Bolton, 1979 

Classification:
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Taxonomic History (provided by Barry Bolton, 2020)

Tetramorium zenatum Bolton, 1979 PDF: 151, fig. 19 (w.q.) MADAGASCAR. Malagasy. AntCat AntWiki HOL
// Distribution

Distribution:

  Geographic regions (According to curated Geolocale/Taxon lists):
    Africa: Madagascar
  Biogeographic regions (According to curated Bioregion/Taxon lists):
    Malagasy

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 zenatumHNS sp. n.

(Fig. 19)

Holotype worker. TL 2.6, HL 0.64, HW 0.60, CI 94, SL 0.42, SI 70, PW 0.47, AL 0.72. Mandible coarsely longitudinally striate, anterior clypeal margin with a distinct notch or impression.

Frontal carinae strong and surmounted by a narrow rim or flange, posteriorly weaker and curving downwards around the posterior part of the scrobe, not becoming confused with the sculpture of the occipital region. Scrobes shallow but broad, bounded below by a longitudinal carina running above the eye which is upcurved posteriorly and confluent with the downcurved frontal carina. Anteriorly the scrobe divided into upper and lower portions by a feeble median carina which ends just beyond the level of the eye. Eyes with maximum diameter 0.11, about 018 x HW. Propodeal spines short and acute, the metapleural lobes elongate-triangular. Petiole in profile very distinctly shaped, see Fig. 19, the dorsum flat. In dorsal view the node about as long as broad. Dorsum of head irregularly finely rugulose, forming a reticulum occipitally. Spaces between rugulae with a punctulate ground-sculpture. Dorsal alitrunk reticulaterugulose, the dorsal surfaces of the rugulae feebly punctulate. Petiole node finely rugulose, the postpetiole and gaster unsculptured, smooth and shining. All dorsal surfaces of head and body with numerous short, fine hairs. Colour orange-brown.

Paratype worker. As holotype but teneral and without full adult colour. Slightly smaller than holotype, TL 2.5, HL 0.62, HW 0.56, CI 90, SL 0.42, SI 75, PW 0.45, AL 0.69. The eye with maximum diameter 0.10.

Holotype worker, Madagascar: Causse de Kelifely, 20 - 30. xi. 1974, forest humus and litter, dry forest AB 47 (A. Peyrieras) (MCZ, Cambridge). Paratypes. One worker and one dealate female with same data as holotype (MCZ, Cambridge; BMNH).

This species is closest related to plesiarumHNS, both species sharing a similar strong development of the antennal scrobes, but the unique shape of the petiole node of zenatumHNS quickly separates it from plesiarumHNS, compare Figs 19 and 27. Also, the carina forming the lower scrobe margin is confluent with the frontal carina posteriorly in zenatumHNS, but in plesiarumHNS the two do not join, as indicated in Fig. 27.

Specimen Habitat Summary

Found most commonly in these habitats: 13 times found in rainforest, 9 times found in tropical dry forest, 4 times found in tropical dry forest on tsingy, 4 times found in montane rainforest, 1 times found in transition humid forest, 2 times found in gallery forest, 2 times found in disturbed dry forest, 2 times found in dry forest, 1 times found in Gallery forest on sandy soil, 1 times found in littoral forest on sandy soil, ...

Found most commonly in these microhabitats: 23 times sifted litter (leaf mold, rotten wood), 6 times sifted litter, 2 times ex rotten log, 2 times forest humus & litter, 1 times under stone, 1 times ex rotten stick on ground.

Collected most commonly using these methods: 15 times MW 50 sample transect, 5m, 2 times 9 maxi winks, 2 times pitfall trap, PF 50 traps, 11 cm dbh with water, soap, formalin, nonlinear placement, 4 times 3 MaxiWinks, mixed samples, 1 times 9 MaxiWinks, mixed samples, 2 times MW 75 sample transect, 5,10m, 3 times 10 MaxiWinks, mixed samples, 2 times MW 25 sample transect, 5m, 1 times yellow pan trap, 25 YP, 1 times YP 25 trap transect, 1 times Malaise trap, ...

Elevations: collected from 15 - 1860 meters, 447 meters average

Collect Date Range: collected between 1974-11-20 and 2014-03-15

Type specimens: Holotype: casent0344941



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