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Species: Crematogaster (Orthocrema) rochai   Forel, 1903 

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Taxonomic History (provided by Barry Bolton, 2023)

Crematogaster rochai Forel, 1903e PDF: 255 (w.q.m.) BRAZIL (Ceará). Neotropic. Primary type information: Type-material: lectotype worker (by designation of Morgan & Mackay, 2017 PDF: 356). Type-locality: lectotype Brazil: Ceará (F. Diaz da Rocha). Type-depository: MHNG. Secondary type information: Paratype-material: paralectotype workers, paralectotype queens, paralectotype males (numbers not stated). Paratype-locality: same as for lectotype. Paratype-depository: MHNG. AntCat AntWiki HOL

Taxonomic history

Lectotype designation: Morgan & Mackay, 2017 PDF: 356.
[Also described as new by Forel, 1908a PDF: 67.]
// Distribution


  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: Argentina, Bolivia, Brazil, Colombia, Costa Rica, Ecuador, El Salvador, French Guiana, Guatemala, Guyana, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Venezuela
  Biogeographic regions (According to curated Bioregion/Taxon lists):

Distribution Notes:

Widespread in Neotropics from southern Mexico to Argentina.


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, 7 times found in roadside vegetation, 4 times found in second growth forest, 4 times found in Escarpment with xeric vegetation, dropping to flat pasture with scattered trees., 2 times found in garden, 2 times found in lowland rainforest, 1 times found in scrubby forest, 1 times found in scrubby riparian vegetation, 1 times found in shaded lawn, ...

Found most commonly in these microhabitats: 4 times in acacia tree, 2 times on oil palm, 2 times ex ant acacia, 2 times general collecting, 3 times beating vegetation, 1 times nest in dead stick, 1 times nest in branch Conocarpus, 1 times Nest in 8mm dead stick, 1 times in cavities in and under bark of live tree, 1 times workers on dead fencepost; shade., 1 times under bark flaps, ...

Collected most commonly using these methods: 9 times search, 3 times Beating, 2 times direct collection, 1 times Canopy Fogging, 1 times HandCollection, 1 times pitfall, 1 times sweep, 1 times Baiting.

Elevations: collected from 2 - 2200 meters, 277 meters average

Collect Date Range: collected between 1891-01-01 00:00:00.0 and 2021-03-24 00:00:00.0

Type specimens: paratype of Crematogaster rochai: focol0657; rochai syntype: jtl028029; syntype malevolens: jtl055984; syntype of Crematogaster brevispinosa malevolens: casent0912755; syntype of Crematogaster rochai: casent0901464, casent0902172, casent0908402, casent0917798, casent0917799; syntypes carminis: jtl027887; syntypes convicta: jtl055887, jtl055888; syntypes fautrix: jtl055949; syntypes malevolens: jtl056052, jtl056053; syntypes subtonsa: jtl056054; tucumanensis syntype: jtl028026, jtl028027

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