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Species: Crematogaster rochai   Forel, 1903 


Classification:
Download Data

See Also:

Crematogaster rochai_cf

Taxonomic History (provided by Barry Bolton, 2017)

Crematogaster rochai Forel, 1903e PDF: 255 (w.q.m.) BRAZIL. Neotropic. AntCat AntWiki HOL

Taxonomic history

[Also described as new by Forel, 1908a PDF: 67.].
Revived status as species: Longino, 2003A PDF: 102.
Senior synonym of Crematogaster malevolens: Wild, 2007B PDF: 52.

Distribution:


Neotropical Region: Ahuachapán, Alajuela, Americas, Anzoátegui, Argentina, Atlántida, Bolivia, Brazil, Buenos Aires, Canindeyú, Catamarca, Ceará, Central, Central America, Chiapas, Colombia, Colón, Concepción, Costa Rica, Ecuador, El Salvador, Formosa, Goiás, Granada, Guanacaste, Guatemala, Guyana, Guárico, Honduras, Huila, Izabal, Jalisco, La Guajira, La Libertad, La Paz, La Paz, La Unión, Magdalena, Mato Grosso, Meta, Mexico, Minas Gerais, Morelos, Nayarit, Nicaragua, Orellana, Panama, Paraguay, Pará, Peru, Petén, Presidente Hayes, Puntarenas, Rio Grande do Norte, San Luis, San Salvador, Santa Cruz, Santander, Sonsonate, South America, Suchitepéquez, São Paulo, Tucumán, Usulután, Venezuela

Distribution Notes:

Widespread in Neotropics from southern Mexico to Argentina.

Biology:

Natural History:

Crematogaster rochai has a biology very similar to crinosa and torosa. It occurs primarily in open, seasonally dry areas, highly disturbed areas, pasture edges, and beach margins. It occasionally occurs in mangroves, although crinosa is the more common mangrove inhabitant. I have never collected it in rainforest areas.

Nests are large, polydomous, and distributed in a wide variety of plant cavities. Dead branches and knots in living trees are most often used. In Guanacaste Province in Costa Rica colonies may occupy ant acacias and may invade acacias occupied by Pseudomyrmex. I have seen workers distributed in small chambers scattered in the corky bark of Tabebuia trees (Bignoniaceae) and Erythrina trees (Fabaceae). Workers often construct small carton baffles to restrict nest entrances and small carton pavilions that shelter Homoptera on surrounding vegetation.

Foraging is primarily diurnal. Workers are generalized scavengers and they frequently visit extrafloral nectaries. Often columns of workers move between nests.

I often find cockroach egg cases scattered in the nest chambers of C. rochai, at a much higher density than in the environment generally. The nature of the relationship between cockroaches and the crinosa group would be worth investigation.

Taxonomic Treatment (provided by Plazi)

Scientific Name Status Publication Pages ModsID GoogleMaps
Crematogaster rochai REVISED STATUS  Longino, J. T., 2003, The Crematogaster (Hymenoptera, Formicidae, Myrmicinae) of Costa Rica., Zootaxa 151, pp. 1-150: 102-103, (download) 102-103 20256
Crematogaster rochai   Wild, A. L., 2007, A catalogue of the ants of Paraguay (Hymenoptera: Formicidae)., Zootaxa 1622, pp. 1-55: 32, (download) 32 21367
Crematogaster rochai   Wild, A. L., 2007, A catalogue of the ants of Paraguay (Hymenoptera: Formicidae)., Zootaxa 1622, pp. 1-55: 52, (download) 52 21367

Specimen Habitat Summary

Found most commonly in these habitats: 8 times found in tropical dry forest, 10 times found in beach, 4 times found in roadside vegetation, 4 times found in Escarpment with xeric vegetation, dropping to flat pasture with scattered trees., 4 times found in second growth forest, 1 times found in 2nd growth dry forest, 1 times found in scrubby forest, 2 times found in lowland rainforest, 1 times found in scrubby riparian vegetation, 1 times found in shaded lawn, ...

Found most commonly in these microhabitats: 2 times on oil palm, 2 times ex ant acacia, 2 times night walk along trail that skirts south side of estuary, looping around to road, 2 times general collecting, 3 times beating vegetation, 1 times under bark flaps, 1 times Roadside veg., workers on dead fencepost; shade., 1 times recent treefall, 2 times on tree trunk, 1 times on ant acacia., 1 times Nesting in 7-12mm dead sticks., ...

Collected most commonly using these methods: 9 times search, 4 times In acacia tree, 3 times Beating, 1 times Baiting, 1 times Canopy Fogging, 1 times pitfall, 1 times sweep.

Elevations: collected from 5 - 1114 meters, 224 meters average

Type specimens: rochai syntype: jtl028029; syntype malevolens: jtl055984; syntype of Crematogaster brevispinosa malevolens: casent0912755; syntype of Crematogaster rochai: casent0901464, casent0902172, casent0908402; syntypes carminis: jtl027887; syntypes convicta: jtl055887, jtl055888; syntypes fautrix: jtl055949; syntypes malevolens: jtl056052, jtl056053; syntypes subtonsa: jtl056054; tucumanensis syntype: jtl028026, jtl028027; type of Cremastogaster rochai: focol0657



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