Gnamptogenys striatula

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Gnamptogenys striatula
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Gnamptogenys
Species: G. striatula
Binomial name
Gnamptogenys striatula
Mayr, 1884

Gnamptogenys striatula casent0173386 profile 1.jpg

Gnamptogenys striatula casent0173386 dorsal 1.jpg

Specimen labels

Synonyms
At a Glance • Gamergate  
 

A common widespread species that exhibits wide variation in some characters.

Identification

A member of the striatula subgroup (in the striatula species group). This widespread, common, and fairly variable ant has been the object of a lengthy synonymic list. Most of the names were based upon differences in size, gauge of costulation, and the shape of the subpetiolar process and the mesopisternal lobe. These size differences are all normal for the species. One can recognize coarsely costulate and finely costulate specimens, as well as intermediate forms. The finely costulate ants can be found in several places: s. Brazil, Argentina, Guiana, Costa Rica, Jamaica and Hispaniola. Occasional series can be found that have transverse costulae on part or all of the propodeal declivity; this condition is not frequent on the finely costulate forms. Several series from Bolivia have a long anterior slope of the node, which approaches the condition in pleurodon. The use of the subpetiolar process in the separation of species is of limited value as a variation from subquadrate to anteriorly projecting lobe can be found in series from the same population or even nest. Brown (1957:489) already discussed the futility of using the mesepisternal lobe. (Lattke 2004)

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina, Barbados, Bolivia, Brazil, Colombia, Costa Rica (type locality), Dominican Republic, Ecuador, French Guiana (type locality), Greater Antilles, Guadeloupe, Guatemala, Guyana, Lesser Antilles, Martinique, Mexico, Panama, Paraguay, Puerto Rico, Suriname, Trinidad and Tobago, Uruguay, Venezuela.

Distribution based on specimens

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The above specimen data are provided by AntWeb. Please see Gnamptogenys striatula for further details

Biology

Based on Lattke 1990: A generalist epigaeic forager of humid forests. A preference for nesting in decomposed wood but will also nest in other places such as under stones or debris. Mature nests contain from 150-200 workers.

A mite was found on the anterolateral petiolar side of one specimen from Beni, Bolivia. (Lattke 1995).

Castes

Several gamergates reproduce in most colonies, while one or several dealate queens reproduce in others. Cuticular Hydrocarbons differ qualitatively and quantitatively between egg-laying and infertile workers, thus providing reliable information about current fertility (Lommelen et al. 2006).

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • striatula. Gnamptogenys striatula Mayr, 1884: 32 (w.) FRENCH GUIANA. Mayr, 1887: 542 (q.m.); Gallardo, 1918b: 26 (q.m.); Wheeler, G.C. & Wheeler, J. 1952a: 123 (l.). Combination in Ectatomma (Holcoponera): Mayr, 1887: 541; in Holcoponera: Emery, 1911d: 40; in Gnamptogenys: Brown, 1958g: 229. Senior synonym of obscurum: Santschi, 1929h: 442; of antillana: Brown, 1956b: 490; of angustiloba (and its junior synonym vollenweideri), angustipleura, brasiliensis, calcarata, paulina, pernambucana, and material of the unavailable name hybrida referred here: Brown, 1958g: 229; of arcuata, curtulum (and its junior synonym stolli), recta, rustica, simplicoides, wasmanni (and its junior synonym isthmica), wheeleri (and its junior synonym mayri): Lattke, 1995: 186.
  • curtulum. Ectatomma (Holcoponera) curtulum Emery, 1896g: 47, pl. 1, fig. 8 (w.) COSTA RICA. Forel, 1899c: 7 (q.). Combination in Holcoponera: Emery, 1911d: 40; in Gnamptogenys: Brown, 1958g: 228. Senior synonym of stolli: Brown, 1958g: 228. Junior synonym of striatula: Lattke, 1995: 186.
  • obscurum. Ectatomma (Holcoponera) obscurum Emery, 1896g: 48 (w.) BRAZIL. Combination in Holcoponera: Emery, 1911d: 41. Subspecies of striatula: Forel, 1908c: 341. Junior synonym of striatula: Santschi, 1929h: 442.
  • stolli. Ectatomma (Holcoponera) curtulum var. stolli Forel, 1899c: 7 (w.m.) GUATEMALA. Combination in Holcoponera: Emery, 1911d: 40. Subspecies of curtulum: Santschi, 1929h: 470. Junior synonym of curtulum: Brown, 1958g: 228.
  • brasiliensis. Holcoponera brasiliensis Emery, 1902a: 181 (w.q.m.) BRAZIL. Wheeler, G.C. & Wheeler, J. 1952a: 124 (l.). Junior synonym of striatula: Brown, 1958g: 229.
  • angustiloba. Ectatomma (Holcoponera) striatulum var. angustiloba Forel, 1908c: 341 (w.) BRAZIL. Forel, 1911e: 254 (q.); Gallardo, 1918b: 23 (m.). Combination in Holcoponera: Emery, 1911d: 41. Subspecies of brasiliensis and senior synonym of vollenweideri: Santschi, 1929d: 275; Santschi, 1929h: 453. Junior synonym of striatula: Brown, 1958g: 229.
  • angustipleura. Ectatomma (Holcoponera) striatulum var. angustipleura Forel, 1908c: 342 (w.) BRAZIL. Combination in Holcoponera: Emery, 1911d: 41. Raised to species: Santschi, 1929h: 456. Junior synonym of striatula: Brown, 1958g: 229.
  • paulina. Ectatomma (Holcomyrmex) curtula var. paulina Forel, 1908c: 342 (Holcomyrmex here is an error for Holcoponera) (w.) BRAZIL. Combination in Holcoponera: Emery, 1911d: 40. Subspecies of brasiliensis: Santschi, 1929h: 456. Junior synonym of striatula: Brown, 1958g: 229.
  • simplicoides. Ectatomma (Holcoponera) striatulum var. simplicoides Forel, 1908c: 341 (w.) BRAZIL. Santschi, 1929h: 455 (m.). Combination in Holcoponera: Emery, 1911d: 41; in Gnamptogenys: Brown, 1958g: 229. Subspecies of brasiliensis: Santschi, 1929h: 454. Raised to species: Brown, 1958g: 229. Junior synonym of striatula: Lattke, 1995: 186.
  • vollenweideri. Holcoponera curtula var. vollenweideri Forel, 1912c: 33 (w.) ARGENTINA. Junior synonym of angustiloba: Santschi, 1929d: 275; Santschi, 1929h: 453.
  • antillana. Holcoponera striatula var. antillana Santschi, 1929h: 444, figs. 16, 21 (w.m.) MARTINIQUE I. Junior synonym of striatula: Brown, 1956b: 490.
  • arcuata. Holcoponera regularis var. arcuata Santschi, 1929h: 457 (w.) BRAZIL. Combination in Gnamptogenys: Brown, 1958g: 227. Junior synonym of, and hence first available replacement name for, Holcoponera regularis Santschi, 1929d: 275 [Junior secondary homonym of Gnamptogenys regularis Mayr, 1870b: 965.] and raised to species: Brown, 1958g: 227. Junior synonym of striatula: Lattke, 1995: 186.
  • calcarata. Holcoponera brasiliensis var. calcarata Santschi, 1929h: 452, fig. 28 (w.) BRAZIL. Junior synonym of striatula: Brown, 1958g: 229.
  • pernambucana. Holcoponera brasiliensis var. pernambucana Santschi, 1929h: 452, fig. 27 (w.) BRAZIL (attributed to Borgmeier). Junior synonym of striatula: Brown, 1958g: 229.
  • recta. Holcoponera emeryi var. recta Santschi, 1929h: 465 (w.) BOLIVIA. Junior synonym of pleurodon: Brown, 1958g: 229; of striatula: Lattke, 1995: 186.
  • regularis. Holcoponera regularis Santschi, 1929d: 275 (w.) BRAZIL. [Also described as new by Santschi, 1929h: 457.] [Junior secondary homonym of regularis Mayr, above.] Senior synonym of arcuata and hence the latter the first available replacement name for regularis Santschi: Brown, 1958g: 227.
  • rustica. Holcoponera rustica Santschi, 1929h: 446, figs. 11, 18 (w.) PARAGUAY. Combination in Gnamptogenys: Brown, 1958g: 229. Junior synonym of striatula: Lattke, 1995: 186.
  • wasmanni. Holcoponera wasmanni Santschi, 1929h: 466, fig. 42 (w.) BRAZIL. Combination in Gnamptogenys: Brown, 1958g: 230. Senior synonym of isthmica: Brown, 1958g: 230. Junior synonym of striatula: Lattke, 1995: 186.
  • wheeleri. Holcoponera rustica st. wheeleri Santschi, 1929h: 448, figs. 9, 19 (w.) COSTA RICA.
    • Wheeler, G.C. & Wheeler, J. 1952a: 124 (l.).
    • Combination in Gnamptogenys: Brown, 1958g: 230.
    • Status as species: Brown, 1958g: 230; Bolton, 1995b: 211.
    • Senior synonym of mayri: Brown, 1958g: 230.
    • Junior synonym of striatula: Lattke, 1995: 186.
  • isthmica. Holcoponera wasmanni var. isthmica Santschi, 1929h: 467 (w.) PANAMA. Junior synonym of wasmanni: Brown, 1958g: 230.
  • mayri. Holcoponera brasiliensis var. mayri Santschi, 1929h: 453 (w.) COSTA RICA.
    • Junior synonym of wheeleri: Brown, 1958g: 230.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Lattke (1995): Diagnosis - Pronotal costulae semicircular; dorsoposterior mesosomal costulae longitudinal and slightly diverging caudad; mesometanotum sometimes with semiciruclar costulae; triangular metacoxal teeth; body dark brown.

Specimens determined as G. curtula by Brown for the 1958 revision are G. striatula, and so are several specimens determined as H. wasmanni var. isthmica. Specimens labelled as type series of H. emeryi recta were studied in the USNM and found to be conspecific with striatula and not with G. pleurodon. I was able to examine two G. striatula syntypes in the BMNH. Bill Brown generously shared the notes he took during his study of the following Santschi types in 1963: H. regularis, H. regularis v. arcuata, H. rustica, and H. wheeleri. He concluded that they are all the same species. He also wrote that these specimens plus additional types and specimens he studied (H. striatula v. antillana, v. angustipleura, H. wasmanni, H. wasmanni v. isthmica, H. brasiliensis v. calcarata, v. mayri, H. curtula v. paulina (det. Santschi)) perhaps could be separated into two species using the subpetiolar process. But as already has been mentioned, this process has proven to be an unreliable character for species determination in this group.

References

  • Borges, D. S.; Mariano, C. S. F.; Delabie, J. H. C.; Pompolo, S. G. 2004b. Estudos citogenéticos em formigas neotropicais do gênero Gnamptogenys Roger (Hymenoptera, Formicidae, Ectatomminae). Rev. Brasil. Entomol. 48: 481-484 (page 481-484, karyotype described)
  • Brown, W. L., Jr. 1956d. Notes on the ant genus Holcoponera Mayr, with descriptions of two new species. Insectes Soc. 3: 489-497 (page 490, Senior synonym of antillana)
  • Brown, W. L., Jr. 1958g. Contributions toward a reclassification of the Formicidae. II. Tribe Ectatommini (Hymenoptera). Bull. Mus. Comp. Zool. 118: 173-362 (page 229, Combination in Gnamptogenys, Senior synonym of angustiloba (and its junior synonym vollenweideri), angustipleura, brasiliensis, calcarata, paulina, pernambucana; Material of the unavailable name hybida referred here by Brown.)
  • Emery, C. 1911e. Hymenoptera. Fam. Formicidae. Subfam. Ponerinae. Genera Insectorum 118: 1-125 (page 40, Combination in Holcoponera)
  • Gallardo, A. 1918c. Las hormigas de la República Argentina. Subfamilia Ponerinas. An. Mus. Nac. Hist. Nat. B. Aires 30: 1-112 (page 26, queen, male described)
  • Lattke, J. E. 1995. Revision of the ant genus Gnamptogenys in the New World (Hymenoptera: Formicidae). J. Hym. Res. 4: 137-193 (page 186, Senior synonym of arcuata, curtulum (and its junior synonym stolli), recta, rustica, simplicoides, wasmanni (and its junior synonym isthmica), wheeleri (and its junior synonym mayri): )
  • Lattke, J.E., Fernández, F. & Palacio, E.E. 2007. Identification of the species of Gnamptogenys Roger in the Americas (pp. 254-270). In Snelling, R.R., Fisher, B.L. & Ward, P.S. (eds). Advances in ant systematics: homage to E.O. Wilson – 50 years of contributions. Memoirs of the American Entomological Institute 80: 690 pp. PDF
  • Lommelen, E., Johnson, C.A., Drijfhout, F.P., Billen, J., Wenseleers, T. & Gobin, B. 2006. Cuticular Hydrocarbons Provide Reliable Cues of Fertility in the Ant Gnamptogenys striatula. J Chem Ecol 32, 2023–2034 (DOI 10.1007/s10886-006-9126-8)
  • Lommelen, E., Johnson, C.A., Drijfhout, F.P., Billen, J. & Gobin, B. 2008. Egg marking in the facultatively queenless ant Gnamptogenys striatula: The source and mechanism. Journal of Insect Physiology 54, 727–736 (doi:10.1016/j.jinsphys.2008.02.002)
  • Mayr, G. 1884. [Untitled. Descriptions of eight new species.]. Pp. 31-38 in: Radoszkowsky, O. Fourmis de Cayenne Française. Tr. Rus. Entomol. Obshch. 18:30-39. (page 32, worker described)
  • Mayr, G. 1887. Südamerikanische Formiciden. Verh. K-K. Zool.-Bot. Ges. Wien 37: 511-632 (page 542, queen, male described; page 541, Combination in Ectatomma (Holcoponera))
  • Santschi, F. 1929h. Révision du genre Holcoponera Mayr. Zool. Anz. 82: 437-477 (page 442, Senior synonym of obscurum)
  • Wheeler, G. C.; Wheeler, J. 1952a. The ant larvae of the subfamily Ponerinae - Part I. Am. Midl. Nat. 48: 111-144 (page 123, larva described)