Dorymyrmex pyramicus

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Dorymyrmex pyramicus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Dolichoderinae
Genus: Dorymyrmex
Species: D. pyramicus
Binomial name
Dorymyrmex pyramicus
(Roger, 1863)

Dorymyrmex pyramicus casent0173213 p 1 high.jpg

Dorymyrmex pyramicus casent0173213 d 1 high.jpg

Specimen Labels

Subspecies

Identification

Cuezzo and Guerrero (2011) - Worker Promesonotal profile continuous, strongly convex. Head, mesosoma, and legs reddish-yellow with gaster dark brown to black. Psammophore reaches the posterior margin of hypostoma. Queen Head subquadrate, maximum width at level of compound eyes; scape surpassing the posterior margin of head by no more than its maximum width; mandibles feebly striated with four teeth and two denticles on the masticatory margin; posterior margin of head straight. Forewing with only one large cubital cell. Male Head wider than long; posterior margin of head medially concave; scape long, surpassing the level of compound eyes, pygostyle poorly developed.

This species was described by Roger as Prenolepis pyramica from one worker collected in Bahia, Brazil, and transferred to Dorymyrmex by Mayr (1870). Unfortunately, Wheeler (1902) erroneously stated that Formica insana Buckley (1866) (Dorymyrmex insanus) was an “undoubtedly synonym” of D. pyramicus. Originally, Formica insana was described from Texas and southern states of the United States. Workers of D. insanus are concolorous black to dark brown, as Snelling (1973) says, differing from workers of D. pyramicus that are typically bicolored, as we describe above. Nevertheless, this mistake persisted, authors having considered D. pyramicus as a species with a very large distribution, from the south part of the United States throughout the Caribbean area to the north of Argentina. We only found one worker of D. pyramicus in Colombia, but there are bibliographic records that confirm its presence in this country (Fernandez and Sendoya 2004) . Apparently, D. insanus and D. pyramicus are only sympatric in Central America (Cuba and Guatemala) and in the north part of South America (Colombia, Venezuela, and Northern Brazil). Beside color, D. pyramicus and D. insanus can be differentiated by the shape of head in full-face view and the shape of the promesonotal profile (continuous in D. pyramicus, interrupted at its end in D. insanus).

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina, Belize, Brazil (type locality), Colombia, Costa Rica, Cuba, Greater Antilles, Grenada, Guatemala, Guyana, Lesser Antilles, Mexico, Suriname, Uruguay.

Distribution based on specimens

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The above specimen data are provided by AntWeb. Please see Dorymyrmex pyramicus for further details


Biology

Castes

Nomenclature

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

  • pyramicus. Prenolepis pyramica Roger, 1863a: 160 (w.) BRAZIL. Emery, 1888c: 362 (m.); Gallardo, 1916a: 56 (q.); Wheeler, G.C. & Wheeler, J. 1951: 183 (l.); Goni, et al. 1983: 366 (k.). Combination in Dorymyrmex: Mayr, 1870b: 947; in D. (Conomyrma): Forel, 1913l: 244; in Conomyrma: Kusnezov, 1952g: 430; in Dorymyrmex: Shattuck, 1992c: 85. Current subspecies: nominal plus albemarlensis, alticonis, garbei, guyanensis, mesonotalis, nigriventris, peruvianus, rubriceps. See also: Emery, 1895c: 331; Snelling, R.R. 1973b: 4; Cuezzo & Guerrero, 2011: 19.

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

Description

Worker

Cuezzo and Guerrero (2011) - (n = 10): HL: 0.78–0.88; HW: 0.73–0.78; EL 0.20–0.25; EW: 0.1–0.13; SL: 0.78–0.85; WL: 1.18–1.20; CI: 89–94; SI: 97–100; REL: 26–29; OI: 50–52; TLI: 137–152.

Head, mesosoma, and petiole concolorous reddish yellow; gaster always darker than the rest of the body, frequently dark brown to black. Whitish and sparse pubescence covering all body tagma. Head: posterior margin of head feebly emarginated medially. Psammophore with short hairs forming a triangle; the hairs in the top line are dispose near to the foramen magnum and do not reach the oral cavity. Upper seta line of psammophore close to anterior margin of foramen magnum. Mesosoma: pronotum with two subdecumbent short setae. Promesonotal profile strongly convex. Mesonotum not angulated, as in Dorymyrmex insanus. Propodeal tubercle well developed and directed dorsally. Declivitous face of propodeum, straight. Metasoma: petiolar scale pointing dorsally.

Queen

Cuezzo and Guerrero (2011) - (n = 2): HL: 1.15–1.18; HW: 1.18–1.2; EL: 0.33–0.4; EW: 0.13–0.15; IOD: 0.73; SL: 0.93–0.95; WL: 1.93–1.95; CI: 102-103; SI: 80-81.

Color and pubescence as in worker. Head: subquadrate; scape surpassing the posterior margin of head by no more than its maximum width; mandibles feebly striated, four teeth and two denticles on the masticatory margin; posterior margin of head straight; external margin of compound eye included in head surface in frontal view; ocelli hyaline, close to the posterior margin of head. Mesosoma: parapsidal furrows not well developed but parallels, axilla not divided medially. Anepisternum incompletely separated from katepisternum by a short suture. Forewing with only one close cubital cell; radial cell open. Metasoma: petiolar scale low, stout, and rounded apically.

Male

Cuezzo and Guerrero (2011) - (n = 2): HL: 0.6–0.64; HW: 0.7–0.75; EL: 0.2–0.26; EW: 0.13–0.14; SL: 0.34; WL: 1.48–1.50.

Body color similar to worker and queen. Head: subquadrate, wider than long; lateral side of clypeus feebly projected forward; mandibles thin, with four teeth, apical tooth more than twice longer than the others; scape long, surpassing posterior margin of compound eyes. Mesosoma: parapsidal furrows present and parallel, axilla not divided medially; forewing with one close radial cell and no cubital nor discoidal cell. Hindwing with two basal cells. Metasoma: petiole stout and low, directed dorsally, ventral process round, feebly developed. Pygostyle poorly developed; gonystylus stout covered with few erect setae; digitus short and no cuspis. Aedeagus with serrate ventral border.

Etymology

Cuezzo and Guerrero (2011) - The name of pyramicus refers to the typical tubercle or cone on propodeum present in all species of Dorymyrmex, giving to the propodeal angle an appearance of pyramid. Several Dorymyrmex species are known as “pyramid ants.”

References

  • Cuezzo, F. and Guerrero, R.J. 2011. The ant genus Dorymyrmex Mayr in Colombia. Psyche. 2012:24 pp. Article ID 516058. [doi: 10.1155/2012/516058.] PDF
  • Emery, C. 1888c [1887]. Formiche della provincia di Rio Grande do Sûl nel Brasile, raccolte dal dott. Hermann von Ihering. Bull. Soc. Entomol. Ital. 19: 352-366 (page 362, male described)
  • Emery, C. 1895d. Beiträge zur Kenntniss der nordamerikanischen Ameisenfauna. (Schluss). Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 8: 257-360 (page 331, see also)
  • Forel, A. 1913m. Fourmis d'Argentine, du Brésil, du Guatémala & de Cuba reçues de M. M. Bruch, Prof. v. Ihering, Mlle Baez, M. Peper et M. Rovereto. Bull. Soc. Vaudoise Sci. Nat. 49: 203-250 (page 244, Combination in D. (Conomyrma))
  • Gallardo, A. 1916b. Las hormigas de la República Argentina. Subfamilia Dolicoderinas. An. Mus. Nac. Hist. Nat. B. Aires 28: 1-130 (page 56, queen described)
  • Goñi, B.; Zolessi, L. C. de; Imai, H. T. 1984 [1983]. Karyotypes of thirteen ant species from Uruguay (Hymenoptera, Formicidae). Caryologia 36: 363-371 (page 366, karyotype described)
  • Kusnezov, N. 1952j [1951]. El estado real del grupo Dorymyrmex Mayr (Hymenoptera, Formicidae). Acta Zool. Lilloana 10: 427-448 (page 430, Combination in Conomyrma)
  • Mayr, G. 1870b. Neue Formiciden. Verh. K-K. Zool.-Bot. Ges. Wien 20: 939-996 (page 947, Combination in Dorymyrmex)
  • Roger, J. 1863a. Die neu aufgeführten Gattungen und Arten meines Formiciden-Verzeichnisses nebst Ergänzung einiger früher gegebenen Beschreibungen. Berl. Entomol. Z. 7: 131-214 (page 160, worker described)
  • Shattuck, S. O. 1992c. Generic revision of the ant subfamily Dolichoderinae (Hymenoptera: Formicidae). Sociobiology 21: 1-181 (page 85, Combination in Dorymyrmex)
  • Snelling, R. R. 1973b. The ant genus Conomyrma in the United States (Hymenoptera: Formicidae). Contr. Sci. (Los Angel.) 238: 1-6 (page 4, see also)
  • Wheeler, G. C.; Wheeler, J. 1951. The ant larvae of the subfamily Dolichoderinae. Proc. Entomol. Soc. Wash. 53: 169-210 (page 183, larva described )