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Costa Rica (Atlantic lowlands). A. emarginatus complex: Belize and Honduras south to Amazonian Brazil, caribbean islands.
Anochetus are presumably predators, using their snapping mandibles much like their larger relatives, Odontomachus. However, there are few direct observations. A. striatulus nests in the low arboreal zone in wet forest, under epiphytes and in carton nests.
These images show a typical nest (lateral view, 70k, 350k; orange in photos is piece of old trail flagging on sapling; dorsal view, 70k, 350k). The images were taken near the El Ceibo station in Braulio Carrillo National Park in June 2002. The nest was about 1m high on the trunk of a small tree sapling. There was a cluster of epiphyte roots comprised of aroid stems climbing the trunk, and the roots of a large Codonanthe(?) and some other small seedlings. The matrix was composed of vegetation fragments, especially visible on top as a loose pile of small fragments that appeared to be dried stipules or bracts of some kind. The workers came boiling out on disturbance.
Chris Starr and students (pers. comm.) have studied the closely related A. emarginatus in Trinidad, and conclude that it does not have normal winged queens. Instead colonies have gamergates (reproductive workers). I have never collected alate queens of striatulus, and so it is possible that striatulus has a similar reproductive biology.
Brown, W. L., Jr. 1978. Contributions toward a reclassification of the Formicidae. Part VI. Ponerinae, tribe Ponerini, subtribe Odontomachiti. Section B. Genus Anochetus and bibliography. Studia Entomol. 20:549-652.
Emery, C. 1890. Voyage de M. E. Simon au Venezuela. Formicidae. Annls Soc. Entomol. Fr. 19:55-76.
Fabricius, J. C. 1804. Systema Piezatorum. Brunsvigae: C. Reichard. xiv + 15-439 + 30pp. Ants - p. 395-428.
Forel, A. 1908. Fourmis de Costa-Rica recoltees par M. Paul Biolley. Bull. Soc. Vaud. Sci. Nat. 44:35-72.
Found most commonly in these habitats: 13 times found in montane wet forest, 2 times found in wet forest, 1 times found in Primary forest at river edge, 2 times found in rainforest, 1 times found in 2nd growth rainforest, 1 times found in mature rainforest, 2 times found in Primary wet forest, 1 times found in ensenada, 1 times found in mature and second growth wet forest, 1 times found in second growth forest.
Found most commonly in these microhabitats: 8 times Sobre Vegetacion, 1 times nest in rotten knot, 1 times carton nest on treetrunk, 2 times nocturnal strays, 1 times nest in root mat on trunk, 1 times in small antgarden, 1 times bos. abierto, 1 times bajo de M/05, 1 times strays, 1 times nocturnal foragers, 1 times ground nest on stream bank, with epiphyte seedlings on surface, ...
Collected most commonly using these methods: 8 times Sweeping, 4 times search, 3 times Foggin, 1 times flight intercept trap, 1 times Malaise.
Elevations: collected from 100 - 820 meters, 436 meters average