Tetramorium immigrans

Pavement Ant
Tetramorium immigrans

 

Pavement Ant Tetramorium immigrans workers dueling it out. May 01, 2009, Wheatley, Ontario.
Pavement Ant Tetramorium immigrans workers dueling it out. May 01, 2009, Wheatley, Ontario.

Identification:
Head: Rectangular, black to very dark brown with long grooves and ridges.
Antenna: Light brown, 12-segmented, the last 3 joints wider (clubbed), base (scape) short, does not reach top of head.
Thorax: Black to very dark brown with long grooves and ridges. Shoulders slightly raised, and wider than rest of thorax. Short spines on each side of the lower thorax. Two nodes on joint between thorax and abdomen (petiole), last node wider than long.

Pavement Ant Tetramorium immigrans queen and 2 workers. July 07, 2006, Wheatley, Ontario.
Pavement Ant Tetramorium immigrans queen and 2 workers. July 07, 2006, Wheatley, Ontario.

Wings: Clear, veins yellowish-brown, with darker stigma.
Legs: Thighs (femora) dark, enlarged. Rest of legs can be light or dark brown.
Abdomen: Shiny, black to very dark brown, elliptical, covered with scattered short, light hair.
Both queen and male are large, black and shiny. Males have very small heads, huge raised thorax, and do not have the spines on the lower thorax. Queen  has smaller, flat thorax and spines.

Size: Worker 2.5 to 3 mm long, Queen & Male 8 mm long.

Flight Time: June to mid-July.

Habitat: Nests under sidewalks, stones, pavement, and in the crevices of housing structures.

Food: Insects, honeydew, seeds, nuts and plant juices, dead and live insects.

Life Cycle: Nests in exposed soil, under stones and pavement, sometimes in rotting wood. Colonies can be moderately large to very large with over 10,000 workers and more than one queen. Workers can live over 5 years, queens much longer. Will attack other colonies of Paving Ants to expand each colony with fierce battles.

Comments: Essex County – Point Pelee species list.

Synonyms:  Linnaeus 1758
Formica caespitum, Tetramorium caespitum, Myrmica brevinodis var. transversinodis, Tetramorium species E.

References:
Journal of the New York Entomological Society, 1946, Vol. 55 by Enzmann, pp. 47 to 49.
Bulletin of the Museum of Comparative Zoology, 1950, Vol. 104 by Creighton, pg. 286, pp. 290 to 291.
Bulletin of the Brooklyn Entomological Society, 1964. Not Available.
Entomological News, 1965, Vol. 76 by Weber, pg. 137.
United States Agriculture, 1965, Technical Bulletin #1326 by Smith, pp. 45 to 47.
Catalog of Hymenoptera, 1979, Vol. 2, pg. 1400.
Entomological News, 1995, Vol. 106 by King & Green, pp. 224 to 227.
Auburn University Alabama, 2003, Thesis Forster: Ants of Alabama, pp. 183 to 184.

Types: Unknown.