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SUBFAMILY MYRMICINAE - Genus Tetramorium - Tetramorium caldarium (Roger)

Tetramorium caldarium (Roger)

return to group key Type location Germany (Tetrogmus caldarius n. sp., Roger, 1857: 12, worker; Meinert, 1861: 331, male) from a hothouse at Rauden, near Dresden - see
junior synonyms
hemisi (as variety of pusillum, Wheeler, 1922: 193, worker) from Zare, Niangara by H.O. Lang, in the stomach of a frog - see
minutum (Tetramorium minutum sp. n., Donisthorpe, 1942a: 30, queen) from Egypt, Siwa - see below
transformans (Tetramorium pauper stirps transformans nov., Santschi, 1914b: 104, worker) from Kenya, Shimoni, xi.1911, Alluaud & Jeannel - no images on Antweb (April 2015)
(see Bolton, 1995) .

Roger's (1857) description is at {original description} and {original description}. Santschi's (1914b) description of transformans is at {original description}. Donisthorpe's (1942a) description of minutum is at {original description}.

{Tetramorium caldarium}Bolton's modern descriptions are at - (1979, based primarily on New World specimens) {original description} and (1980) {original description}.

WORKER - TL 2.1-2.4 mm; with weak frontal carinae and little trace of antennal scrobes. Short, stout blunt hairs on all dorsal surfaces of the body. Colour yellow or light yellowish brown (Bolton, 1980, not illustrated).

A panglobal tramp species, which Bolton (1980) thought to be of African origin. The sole West African records which he listed were from Nigeria, at the savannah location of Mokwa (B. Lasebikan); and Ivory Coast, at ORSTOM (W.L. Brown).

{Tetramorium caldarium heads} In his blanket description, Bolton (1980) wrote of his suspicion that there are two closely similar species, differing particularly in the width between the frontal carinae at the level of the eyes. Specimens from East Africa and India had this separation as < 0.50 X HW, whereas most Old World and all New World specimens had HW > 0.50 HW. From the specimens shown below, it seems that another consistent feature of the type form is a uniformly dark gaster. In the East African & Saudi Arabia specimens the gaster has variably lighter areas.

For more on the confused mess of susbspecies and synonyms see

Oxford University Museum specimens

Tetramorium caldarium
B Taylor det.
Mostafa Sharaf
Marsa Matrouh
3121' N
2714' E
Kaseh Tourist Village
Tetramorium caldarium
B Taylor det.
Saudi Arabia
Mostafa Sharaf
Farasan Islands
1642' N
4211' E
Major Farasan I., Red Sea

{Tetramorium minutum}Egypt records - in HNS as Tetramorium minutum Donisthorpe (1942a) single queen from Siwa Oasis, collected by J Omer-Cooper, 17.vii.1935. Photomontage collated from

{Tetramorium caldarium}The photomontage is of a worker from Egypt, Kaseh; collector Mostafa Sharaf

{Tetramorium caldarium}The photomontage is of a specimen from Saudi Arabia, Farasan Islands, Major Farasan I., Red Sea, 25.ii.2005; 1642' N, 4211' E, collector Mostafa Sharaf.

2005, 2006, 2009, 2015 - Brian Taylor CBiol FRSB FRES
11, Grazingfield, Wilford, Nottingham, NG11 7FN, U.K.