Brachymyrmex admotus

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Brachymyrmex admotus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Myrmelachistini
Genus: Brachymyrmex
Species: B. admotus
Binomial name
Brachymyrmex admotus
Mayr, 1887

Brachymyrmex admotus casent0915730 p 1 high.jpg

Brachymyrmex admotus casent0915730 d 1 high.jpg

Specimen Labels

Synonyms

This species makes nests in rotting wood [USNMENT00757763] and it has been collected from below rocks [USNMENT00759009].

Identification

Ortiz-Sepulveda et al. (2019) - Brachymyrmex admotus morphologically resembles Brachymyrmex bonariensis, because both species have long scapes, a conspicuous metanotal groove, a pair of thin erect hairs between the metathoracic spiracles, and a gaster with scarce pubescence. However, B. admotus is usually more uniform brownish in color, it has longer scapes (i.e., the scapes surpass the posterior cephalic margin with a length of approximately 1.5× the maximal diameter of the eye) with decumbent hairs, and its metathoracic spiracles are positioned more dorsally. Brachymyrmex admotus also resembles Brachymyrmex cavernicola in having a pair of erect hairs between the dorsal metathoracic spiracles, but these hairs are thinner in B. admotus and they are not darker in color than the body.

Keys including this Species

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: 23.721111° to -27.74111°.

     
North
Temperate 		North
Subtropical 		Tropical South
Subtropical 		South
Temperate

Distribution based on Regional Taxon Lists

Neotropical Region: Argentina, Brazil (type locality), Paraguay.

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.
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Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.
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Biology

Castes

Images from AntWeb

Brachymyrmex admotus casent0915730 h 2 high.jpg
Lectotype of Brachymyrmex admotus. Worker. Specimen code casent0915730. Photographer Daniela Lehner, uploaded by California Academy of Sciences. Owned by NHMW, Vienna, Austria.

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • admotus. Brachymyrmex admotus Mayr, 1887: 523 (w.q.) BRAZIL (Santa Catarina).
    • Type-material: lectotype worker (by designation of Ortiz-Sepúlveda, et al. 2019: 460), 4 paralectotype workers, 1 paralectotype queen.
    • Type-locality: lectotype Brazil: Santa Catarina (L. Hetschko); paralectotypes with same data.
    • Type-depository: NHMW.
    • [Misspelled as admostus by Santschi, 1923b: 669, Santschi, 1933e: 122.]
    • Wheeler, G.C. & Wheeler, J. 1982: 178 (l.).
    • Status as species: Dalla Torre, 1893: 174; Forel, 1895b: 106; Pergande, 1896: 858 (redescription); Forel, 1899c: 123; Forel, 1907e: 9; Mann, 1916: 473; Santschi, 1923b: 669; Emery, 1925b: 41; Borgmeier, 1927c: 140; Santschi, 1933e: 122; Eidmann, 1936b: 92; Santschi, 1936d: 420; Kempf, 1972a: 38; Bolton, 1995b: 81; Quirán, 2005: 762 (redescription); Ortiz-Sepúlveda, et al. 2019: 460 (redescription).
    • Senior synonym of immunis: Ortiz-Sepúlveda, et al. 2019: 461.
    • Distribution: Argentina, Brazil, Panama, Paraguay.
  • immunis. Brachymyrmex longicornis var. immunis Forel, 1908c: 400 (w.q.m.) BRAZIL (São Paulo).
    • Type-material: syntype workers (number not stated), 1 syntype queen, 1 syntype male.
    • [Note: Ortiz-Sepúlveda, et al. 2019: 461, cite 2w syntypes MHNG.]
    • Type-locality: Brazil: São Paulo (H. von Ihering).
    • Type-depository: MHNG.
    • Subspecies of longicornis: Forel, 1909a: 263; Forel, 1911c: 308; Santschi, 1912e: 533; Bruch, 1915: 534; Luederwaldt, 1918: 48; Santschi, 1923b: 668; Emery, 1925b: 43; Borgmeier, 1927c: 142; Kempf, 1972a: 40; Zolessi, et al. 1988: 6; Bolton, 1995b: 82.
    • Junior synonym of admotus: Ortiz-Sepúlveda, et al. 2019: 461.


Description

Worker

Ortiz-Sepulveda et al. (2019) - Lectotype HL1 0.51; HL2 0.35; HL3 0.12; HW 0.45; SL 0.49; EL 0.10; WL 0.49; PnL 0.14; PnW 0.31; ML 0.08; MW 0.18; Indices CI 88.46; SI1 108.70; SI2 138.89; OI1 21.74; OI2 23.08. Paralectotypes (n = 3). HL1 0.51– 0.57; HL2 0.35–0.39; HL3 0.12–0.14; HW 0.45–0.49; SL 0.55–0.59; EL 0.10; WL 0.53–0.59; PnL 0.14–0.21; PnW 0.31–0.35; ML 0.08–0.12; MW 0.18–0.21; Indices CI 86.21–92.59; SI1 112.00–121.74; SI2 140.00–155.60; OI1 20.00–21.74; OI2 23.08–25.93. Additional material (n = 16). HL1 0.46–0.57; HL2 0.30–0.43; HL3 011–0.14; HW 0.43–0.51; SL 0.47–0.57; EL 0.09–0.13; WL 0.46–0.61; PnL 0.16–0.22; PnW 0.29–0.34; ML 0.09–0.13; MW 0.17– 0.21; Indices CI 87.72–96.6; SI1 105.26–120.00; SI2 131.91– 155.88; OI1 18.87–26.92; OI2 21.43–28.30.


Head. Slightly longer than wide in full face view, with scattered appresed hairs except for two frontal rows of erect hairs; posterior cephalic border slightly concave. Dorsum of the head with sparse appressed pubescence. Clypeus with a rounded anterior margin and five long, erect hairs of which a single, usually conspicuous apical hair is near the anterior margin, two lateral hairs in medial position and two more near the toruli; other hairs on the clypeus are markedly shorter and appressed or decumbent. Toruli surpassing the posterior clypeal margin in oblique anterodorsal view. Scapes extend beyond the posterior cephalic margin by a length of ~ 1.5× the maximum eye diameter or more. The scapes typically have appressed, sometimes decumbent, but never erect hairs. A single central ocellus is present, but sometimes inconspicuous. Eyes are positioned on the cephalic midline and have 7–9 ommatidia along their maximal diameter.

Mesosoma. Usually with two erect hairs on the pronotum and two on the mesonotum; sometimes with additional suberect hairs on both. In lateral view, the mesonotum is not or slightly inflated and it does not or only slightly bulge dorsally above the pronotum. Metanotal groove deep and wider than the diameter of the metathoracic spiracles. Metathoracic spiracles fully dorsal and slightly protruding, they are closer to the propodeal than to the mesometanotal suture, but not touching any suture. Between the metathoracic spiracles two simple erect hairs are present, which are shorter than those on the pronotum and mesonotum. Dorsum of the propodeum flat and ~ 1/3th of the length of the propodeal slope. Propodeal spiracles circular, positioned ventrally of the posterior propodeal margin slightly posterior of the middle of the propodeal slope. Legs with appressed and scattered hairs. Petiole short and inclined forward.

Gaster. With scattered pubescence and scattered long suberect hairs.

Color and sculpture. Body overall smooth and shiny, except for the sometimes slightly imbricate sculpture on the dorsum of the mesosoma; body typically uniform dark brown in color, although in some specimens the head and mesosoma may be light brownish and the gaster darker brown.

Type Material

Ortiz-Sepulveda et al. (2019) - Lectotype worker (Naturhistorisches Museum Wien, Vienna: USNMENT00757197) and paralectotype workers, queen (NHMW:SNMENT00757196, 00757198-00757200; here designated): five workers, one queen [examined]. BRAZIL: Santa Catharina.

Karyotype

Explore-icon.png Explore: Show all Karyotype data or Search these data. See also a list of all data tables or learn how data is managed.
  • 2n = 18, karyotype = 16M + 2SM (Brazil) (Teixeira et al., 2020).

References

References based on Global Ant Biodiversity Informatics

  • Bruch C. 1915. Suplemento al catálogo de los formícidos argentinos. I. (Addenda et corrigenda). Revista del Museo de La Plata 19: 527-537.
  • Cuezzo, F. 1998. Formicidae. Chapter 42 in Morrone J.J., and S. Coscaron (dirs) Biodiversidad de artropodos argentinos: una perspectiva biotaxonomica Ediciones Sur, La Plata. Pages 452-462.
  • Dattilo W. et al. 2019. MEXICO ANTS: incidence and abundance along the Nearctic-Neotropical interface. Ecology https://doi.org/10.1002/ecy.2944
  • Fernandes T. T., R. R. Silva, D. Rodrigues de Souza-Campana, O. Guilherme Morais da Silva, and M. Santina de Castro Morini. 2019. Winged ants (Hymenoptera: Formicidae) presence in twigs on the leaf litter of Atlantic Forest. Biota Neotropica 19(3): http://dx.doi.org/10.1590/1676-0611-bn-2018-0694
  • Fernandes T. T., W. Dattilo, R. R. Silva, P. Luna, C. M. Oliveira, and M. Santina de Castro Morini. 2019. Ant occupation of twigs in the leaf litter of the Atlantic Forest: influence of the environment and external twig structure. Tropical Conservation Science 12: 1-9.
  • Fernandes, P.R. XXXX. Los hormigas del suelo en Mexico: Diversidad, distribucion e importancia (Hymenoptera: Formicidae).
  • Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
  • Forel A. 1908. Ameisen aus Sao Paulo (Brasilien), Paraguay etc. gesammelt von Prof. Herm. v. Ihering, Dr. Lutz, Dr. Fiebrig, etc. Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wien 58: 340-418.
  • Forel A. 1911. Ameisen des Herrn Prof. v. Ihering aus Brasilien (Sao Paulo usw.) nebst einigen anderen aus Südamerika und Afrika (Hym.). Deutsche Entomologische Zeitschrift 1911: 285-312.
  • Franco W., N. Ladino, J. H. C. Delabie, A. Dejean, J. Orivel, M. Fichaux, S. Groc, M. Leponce, and R. M. Feitosa. 2019. First checklist of the ants (Hymenoptera: Formicidae) of French Guiana. Zootaxa 4674(5): 509-543.
  • Kempf W. W. 1978. A preliminary zoogeographical analysis of a regional ant fauna in Latin America. 114. Studia Entomologica 20: 43-62.
  • Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
  • Kusnezov N. 1978. Hormigas argentinas: clave para su identificación. Miscelánea. Instituto Miguel Lillo 61:1-147 + 28 pl.
  • Luederwaldt H. 1918. Notas myrmecologicas. Rev. Mus. Paul. 10: 29-64.
  • Morais da Silva O. G., T. T. Fernandes, R. Rosa da Silva, D. R. de Souza-Campana, and M. Santina de Castro Morini. 2016. Twigs of Albizia niopoides (Spruce ex Benth.) Burkart as a nesting resource for ants (Hymenoptera: Formicidae). Revista Brasileira de Entomologia 60: 182-158.
  • Nascimento Santos M., J. H. C. Delabie, and J. M. Queiroz. 2019. Biodiversity conservation in urban parks: a study of ground-dwelling ants (Hymenoptera: Formicidae) in Rio de Janeiro City. Urban Ecosystems https://doi.org/10.1007/s11252-019-00872-8
  • Ortiz-Sepuvelda C. M., B. Van Bocxlaer, A. D. Meneses, and F. Fernandez. 2019. Molecular and morphological recognition of species boundaries in the neglected ant genus Brachymyrmex (Hymenoptera: Formicidae): toward a taxonomic revision. Organisms Diversity & Evolution https://doi.org/10.1007/s13127-019-00406-2
  • Pergande, T. 1895. Mexican Formicidae. Proceedings of the California Academy of Sciences Ser. 2 :850-896
  • Pérez-Sánchez A. J., J. E. Lattke, and M. A. Riera-Valera. 2014. The Myrmecofauna (Hymenoptera: Formicidae) of the Macanao Semi-arid Peninsula in Venezuela: An Altitudinal Variation Glance. J Biodivers Biopros Dev 1: 116. doi:10.4172/ijbbd.1000116
  • Quiran E. 2005. El género neotropical Brachymyrmex Mayr (Hymenoptera: Formicidae) en la Argentina. II: redescripción de las especies B. admotus Mayr, de B. brevicornis emery y B. gaucho Santschi. Neotrop. Entomol. 34(5): 761-768.
  • Rosa da Silva R. 1999. Formigas (Hymenoptera: Formicidae) do oeste de Santa Catarina: historico das coletas e lista atualizada das especies do Estado de Santa Catarina. Biotemas 12(2): 75-100.
  • Santschi F. 1912. Quelques fourmis de l'Amérique australe. Revue Suisse de Zoologie 20: 519-534.
  • Santschi F. 1923. Revue des fourmis du genre Brachymyrmex Mayr. Anales del Museo Nacional de Historia Natural de Buenos Aires 31: 650-678.
  • Santschi F. 1933. Fourmis de la République Argentine en particulier du territoire de Misiones. Anales de la Sociedad Cientifica Argentina. 116: 105-124.
  • Santschi F. 1936. Fourmis nouvelles ou intéressantes de la République Argentine. Revista de Entomologia (Rio de Janeiro). 6: 402-421.
  • Suguituru S. S., M. Santina de Castro Morini, R. M. Feitosa, and R. Rosa da Silva. 2015. Formigas do Alto Tiete. Canal 6 Editora 458 pages
  • Ulyssea M.A., C. E. Cereto, F. B. Rosumek, R. R. Silva, and B. C. Lopes. 2011. Updated list of ant species (Hymenoptera, Formicidae) recorded in Santa Catarina State, southern Brazil, with a discussion of research advances and priorities. Revista Brasileira de Entomologia 55(4): 603-–611.
  • Vittar, F. 2008. Hormigas (Hymenoptera: Formicidae) de la Mesopotamia Argentina. INSUGEO Miscelania 17(2):447-466
  • Vásquez-Bolaños M. 2011. Lista de especies de hormigas (Hymenoptera: Formicidae) para México. Dugesiana 18: 95-133
  • Zolessi L. C. de, Y. P. Abenante, and M. E. de Philippi. 1988. Lista sistematica de las especies de Formicidos del Uruguay. Comun. Zool. Mus. Hist. Nat. Montev. 11: 1-9.
  • Zolessi L. C. de; Y. P. de Abenante, and M. E. Philippi. 1989. Catálogo sistemático de las especies de Formícidos del Uruguay (Hymenoptera: Formicidae). Montevideo: ORCYT Unesco, 40 + ix pp.
  • de Zolessi, L.C., Y.P. de Abenante and M.E. Philippi. 1987. Lista sistemática de las especies de formícidos del Uruguay. Comunicaciones Zoologicas del Museo de Historia Natural de Montevideo 11(165):1-9
  • de Zolessi, L.C., Y.P. de Abenante and M.E. Phillipi. 1989. Catalago Systematico de las Especies de Formicidos del Uruguay (Hymenoptera: Formicidae). Oficina Regional de Ciencia y Technologia de la Unesco para America Latina y el Caribe- ORCYT. Montevideo, Uruguay
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