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J. Longino, 18 Aug 2014: Regarding Gnamptogenys wheeleri, I now have two collections from Costa Rica and one from Tambopata, Peru, that look identical and have a distinctively depressed dorsal face of the propodeum. Santschi (1929) observed this distinctive morphology and it is illustrated in his Figure 18. He associated the taxa G. rustica, wheeleri, and brasiliensis mayri with this feature, all new taxa described in his revision of Holcoponera. Brown (1958) left rustica and wheeleri as valid species but synonymized mayri under wheeleri, with no discussion. The type locality is Costa Rica for both wheeleri and mayri, and the images of types of both on AntWeb show the distinctive character, so this synonymy is probably solid. Lattke (1995) synonymized them all under striatula.
Gnamptogenys striatula and the form with the depressed propodeum are sympatric in Costa Rica and have different habitat preferences. The former is found in open, disturbed areas, and the latter is a mature forest species. Also, wheeleri has a square-cut anteroventral petiolar process, while the Costa Rican version of striatula has a rounded process without a posterior angle. I consider G. wheeleri a valid species and use this name to refer to this form. With my current knowledge, it occurs at least in Costa Rica and Peru. The relationship to G. rustica, from Paraguay, is unknown. Also, among the South American specimens associated with striatula there is a welter of variation in propodeal shape and the form of the ventral petiolar process. The group is clearly in need of more work in South America.
|Gnamptogenys striatula||n. sp.||Radoszkowsky, O., 1884, Fourmis de Cayenne Française., Trudy Russkago Entomologicheskago Obshchestva 18, pp. 30-39: 32-33, (download)||32-33||1929|
|Gnamptogenys striatula||Wild, A. L., 2007, A catalogue of the ants of Paraguay (Hymenoptera: Formicidae)., Zootaxa 1622, pp. 1-55: 27, (download)||27||21367|
Found most commonly in these habitats: 15 times found in Semideciduous seasonal forest, 8 times found in 2º tropical rainforest, 5 times found in garden, 1 times found in 2nd growth riparian forest, 1 times found in lowland rainforest, 2 times found in montane forest, 2 times found in tropical dry forest, 1 times found in roadside, 3 times found in dry forest, 1 times found in Primary forest and second growth habitats, ...
Found most commonly in these microhabitats: 27 times ex sifted leaf litter, 8 times in rotten log, 3 times strays, 1 times nest in dead wood on forest floor, 1 times under tree bark, 4 times under rock, 1 times nest under dead wood, 1 times nest in clasping petiole Diffenbachia, 2 times under boulder, 2 times litter, 1 times under stone, ...
Collected most commonly using these methods: 11 times Winkler, 12 times MiniWinkler, 6 times search, 8 times Manual sampling, 0 times Berlesate of colonized litter bags (previously sterilized), 4 times Litter extracted in Berlese funnels, 3 times Arboreal pitfall, 2 times Epigaeic pitfall, 1 times Maxi Winkler, 1 times Pitfall, 1 times Winkler48h, ...
Elevations: collected from 5 - 1350 meters, 364 meters average
Type specimens: syntype of Ectatomma curtula paulina: casent0907169; syntype of Ectatomma curtulum stolli: casent0907168; syntype of Ectatomma striatulum angustipleura: casent0907175; syntype of Ectatomma striatulum simplicoides: casent0907176; syntype of Ectatomma striatulum angustiloba: casent0907174; syntype of Ectatomma curtulum: casent0903839; syntype of Ectatomma obscurum: casent0903834; syntype of Gnamptogenys striatula: casent0900551, casent0915917; syntype of Holcoponera brasiliensis calcarata: casent0915123; syntype of Holcoponera brasiliensis mayri: casent0915130, casent0915921; syntype of Holcoponera brasiliensis pernambucana: casent0915125; syntype of Holcoponera brasiliensis simplicoides hybrida: casent0915124; syntype of Holcoponera emeryi recta: casent0915120; syntype of Holcoponera regularis: casent0915111; syntype of Holcoponera regularis arcuata: casent0915110; syntype of Holcoponera rustica: casent0915121; syntype of Holcoponera rustica wheeleri: casent0915129; syntype of Holcoponera striatula antillana: casent0915122; syntype of Holcoponera wasmanni isthmica: casent0915128; syntype of Holcoponera brasiliensis: casent0903837; syntype of Holcoponera curtula vollenweideri: casent0907170; type of Ectatomma striatulum: focol0866; type of Gnamptogenys striatula: focol2916, focol2917