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Species Crematogaster crinosa

Crematogaster - Crematogaster crinosa Crematogaster crinosa Crematogaster crinosa Crematogaster crinosa
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Ants, Bees and Stinging Wasps)
Superfamily Formicoidea (Ants)
Family Formicidae (Ants)
Subfamily Myrmicinae
Tribe Crematogastrini
Genus Crematogaster (Acrobat Ants)
Species crinosa (Crematogaster crinosa)
Synonyms and other taxonomic changes
Crematogaster crinosa Mayr 1862
Identification
Wide and squared head with weak striations (but more so than almost all other US Crematogaster). Short but pointy slightly upturned propodeal spines. Notably it has clear and straight longitudinal striations on the dorsum of the pronotum, which seems to be rare or unique in US Crematogaster fauna.
South TX populations are darkly colored, almost black.
Range
A very widespread Neotropical species, nearly continuous from south Texas to northern Argentina.
In our area known from only Cameron and Hidalgo Co., TX in the LRGV where it seems pretty common.
Habitat
Longino (2003) - "Crematogaster crinosa is an extremely widespread and generalized species that prefers highly insolated habitats. It is common in seasonally dry areas."
This preference for drier tropical habitats means it does well in the thornscrub of southern TX in the LRGV.
Remarks
On nesting habits (Longino 2003) mentions: "Colonies are large and polydomous and it is usually difficult to locate colony boundaries. Nests are found in almost any kind of cavity, and columns of workers move from nest to nest. Nests can be in live or dead branches, in small rotten knots, under bark flaps, in cavities in fence posts, opportunistically in ant plants, and thinly dispersed in multiple small bark cavities. Workers, brood, and alate sexuals are dispersed across nests. Small amounts of carton construction are used to form baffles inside of nest cavities and to restrict nest entrances, but large external carton nests are never constructed."

This is mostly based on their habits in Central America, but there is no reason to think the US population acts any differently.
Internet References