Adelomyrmex tristani

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Adelomyrmex tristani
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Solenopsidini
Genus: Adelomyrmex
Species: A. tristani
Binomial name
Adelomyrmex tristani
(Menozzi, 1931)

Adelomyrmex tristani casent0428612 profile 1.jpg

Adelomyrmex tristani casent0428612 dorsal 1.jpg

Specimen labels

Synonyms

Adelomyrmex tristani is a common cloud forest ant throughout Central America. It is most often collected in Winkler samples, but may also occur at baits.

Identification

Longino (2012) - Adelomyrmex tristani was recognized by Fernández (2003) as highly variable and likely consisting of multiple cryptic species. Large community samples taken by the LLAMA project revealed that at several sites in Central America, two sympatric species occur that both key to A. tristani. In this work I hypothesize two broadly sympatric species, each of which shows substantial geographic variation. In general, when the two species co-occur, A. tristani is the smaller of the two, with shorter, denser, more reclining pilosity, especially on the face and gaster. Adelomyrmex paratristani is larger, with longer, sparser, more erect setae. Where the range of A. tristani overlaps with A. paratristani, the queen has the mesonotum largely smooth and shining, while A. paratristani has the mesonotum largely longitudinally rugose, with an anteromedian triangular patch that is smooth and shining.

In the southern part of the range, where it does not overlap with A. paratristani, the queens have mesonotal sculpture like A. paratristani. In broad terms, A. tristani shows centers of abundance along the Pacific side of Central America, in the Sierra de Chiapas, the Guatemalan volcanoes from Volcan Atitlán to the mountains east of Guatemala City, the Sierra de Comayagua in Honduras, western and southern Nicaraguan mountains, and the mountains of Costa Rica. It becomes a rare element as one moves inland and eastward. In contrast, A. paratristani dominates the core mountain areas of northern Nicaragua, Honduras, Guatemala, and central Chiapas.

Two populations sampled by the LLAMA project are distinctive variants. The population on the south slope of Volcán Atitlán has very short propodeal spines, reduced to short, 90° angles, and the pilosity is very short. Populations in the Sierra de Chiapas to the north and the mountains around Guatemala City to the east have more developed, acute propodeal spines, and the pilosity is slightly longer. A population near La Unión, Guatemala, in Zacapa Department, has relatively sparse, erect gastral pilosity, like A. paratristani, and the dorsal promesonotal rugae are weak, on some specimens leaving a smooth shiny region anteromedially. The population is clearly differentiated from the local version of A. paratristani, in pilosity and size. HW of A. tristani in this population is 0.48–0.56 mm. The local population of A. paratristani has HW 0.62–0.68, and the pilosity is longer.

Keys including this Species

Distribution

Longino (2012) - Mexico to Costa Rica, AntWeb images of a specimen from an Ecuadorian cloud forest look like A. tristani, and thus the range may extend into South America.

Latitudinal Distribution Pattern

Latitudinal Range: 23.1375° to 6.066666667°.

 
North
Temperate 		North
Subtropical 		Tropical South
Subtropical 		South
Temperate

Distribution based on Regional Taxon Lists

Neotropical Region: Colombia, Costa Rica (type locality), Guatemala, Honduras, Mexico, Nicaragua.

Distribution based on AntMaps

AntMapLegend.png

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.
pChart

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.
pChart

Biology

Longino (2012) - At multiple sites in Central America it occurs in sympatry with Adelomyrmex paratristani, a species whose range is contained largely within the range of A. tristani. There is a tendency for A. tristani to be most abundant in regions peripheral to the range of A. paratristani. There is some geographic variation in both A. tristani and A. paratristani, such that both could be split into multiple allopatric or parapatric species in the future, but currently there is no evidence for multiple sympatric forms within the current definition of A. tristani.

Adelomyrmex tristani is most abundant in the northern part of its range, in the Cordillera de Chiapas, extending into the mountains of western Guatemala. It is abundant in cloud forest from 1500-2000 m, occurring in up to 70% of quantitative miniWinkler samples. It occurs as high as 2700 m at Cerro Huitepec near San Cristobal de las Casas, Chiapas.

Castes

Males have yet to be collected.

Worker

Images from AntWeb

Adelomyrmex tristani inbiocri001279821 head 1.jpgAdelomyrmex tristani inbiocri001279821 profile 1.jpgAdelomyrmex tristani inbiocri001279821 label 1.jpg
Worker. Specimen code inbiocri001279821. Photographer C. Richart, uploaded by California Academy of Sciences. Owned by JTLC.
Adelomyrmex tristani psw7832-16 head 1.jpgAdelomyrmex tristani psw7832-16 profile 1.jpgAdelomyrmex tristani psw7832-16 dorsal 1.jpgAdelomyrmex tristani psw7832-16 label 1.jpg
Worker. Specimen code psw7832-16. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by UCDC, Davis, CA, USA.
Adelomyrmex brevispinosus inbiocri001279889 head 1.jpgAdelomyrmex brevispinosus inbiocri001279889 profile 1.jpgAdelomyrmex brevispinosus inbiocri001279889 dorsal 1.jpgAdelomyrmex brevispinosus inbiocri001279889 label 1.jpg
Holotype Adelomyrmex brevispinosus. Worker. Specimen code inbiocri001279889. Photographer John T. Longino, uploaded by California Academy of Sciences. Owned by JTLC.

Nomenclature

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

  • tristani. Apsychomyrmex tristani Menozzi, 1931b: 269, fig. 6 (w.) COSTA RICA.
    • Fernández, 2003b: 30 (q.).
    • Combination in Adelomyrmex: Kempf, 1972a: 18.
    • Status as species: Borgmeier, 1937b: 240; Smith, M.R. 1947b: 472 (redescription); Kempf, 1972a: 18; Bolton, 1995b: 58; Fernández, 2003b: 30 (redescription); Branstetter & Sáenz, 2012: 257; Longino, 2012: 32.
    • Senior synonym of brevispinosus: Longino, 2012: 32.
  • brevispinosus. Adelomyrmex brevispinosus Fernández, in Fernández & Mackay, 2003: 596, figs. 1-3 (w.) COSTA RICA, MEXICO (Chiapas).
    • Status as species: Fernández, 2003b: 15 (redescription).
    • Junior synonym of tristani: Longino, 2012: 32.

Longino (2012) - Adelomyrmex brevispinosus was differentiated from A. tristani by a small median smooth spot on the dorsal promesonotum. Specimens were reported from Costa Rica and Chiapas. However, specimens of A. brevispinosus from these two different regions otherwise look identical to their respective surrounding populations of A. tristani, paralleling the geographic variation. I conclude that A. brevispinosus falls within the intraspecific variability of A. tristani.

Description

Worker

Fernández (2003) - (n=40). HL 0.53-0.73 HW 0.45-0.65 SL 0.29-0.41 EL 0.05-0.08 WL 0.53-0.73 GL 0.63-0.92 TL 2.00-2.84 CI 90-91 SI 55-63.

Head with posterior margin weakly flat to feebly concave. Mandibles with 5 to 6 teeth decreasing in size from the apical teeth. Tooth of basal margin of mandible not protuberant, smaller than subapical masticatory tooth. Eyes small, with 7 to 22 facets. Hypostomal tooth small but visible. Promesonotum slightly convex, higher than propodeal dorsum; metanotal groove well marked. Lateral sides of pronotum angulated. Propodeal spiracle rounded. Propodeum sloping, with the spines variable in size and shape, from low, triangular to long and narrow. Petiole high, with anterior side sloping and posterior side more or less feebly convex; sometimes petiole nearly quadrate, with anterior and posterior faces nearly parallel. Postpetiole campaniform with a ventral transverse ridge toothlike as seen in profile. Sting well developed. Mandibles dorsally with moderate longitudinal rugulations. Clypeal plate smooth and shining. Head frons longitudinally rugulate, head sides irregularly rugulated and mixed with punctures. Promesonotal dorsum variously sculptured, from longitudinal fine rugulae to longitudinal to strong coarse costae, in some workers the rugae or striae mixed, anteriorly oblique to transverse, in a few workers only a very few central longitudinal rugae visible. Promesonotal rugae or striae mixed with punctures. Propodeal declivity transversely rugulated between propodeal spines. Declivitous face of propodeum from smooth to covered with transverse rugae. Petiole and postpetiole normally transversely rugulated, sometimes times dorsally smooth and shining. Legs and gaster smooth and shining.

Hairs yellowish, long and flexuous on the body, more short and appressed on antennae and legs. Body black, dark brown or brown, legs light brown, tarsi yellowish.

Queen

Fernández (2003) - HL 0.75 HW 0.66 SL 0.45 EL 0.11 WL 0.84 GL 1.05 TL 3.22 CI 88 SI 68.

As worker with the following differences: Mandibles with all teeth of masticatory border of similar size. Three ocelli present. 12–13 ommatidia in the largest diameter of eye. Pronotum laterally costulated. Promesonotum longitudinally costulated with areas smooth and shining variable, from anterior half to nearly all promesonotum. Metanotum longitudinally costulated. Mesopleurae with longitudinal costulation and areas smooth and shining. Propodeum costulated longitudinally in the sides, transversely in the declivitous face.

References

  • Baena, M.L., Escobar, F., Valenzuela, J.E. 2019. Diversity snapshot of green–gray space ants in two Mexican cities. International Journal of Tropical Insect Science 40, 239–250 (doi:10.1007/s42690-019-00073-y).
  • Borgmeier, T. 1937b. Formigas novas ou pouco conhecidas da América do Sul e Central, principalmente do Brasil (Hym. Formicidae). Arch. Inst. Biol. Veg. (Rio J.) 3: 217-255 (page 240, worker described)
  • Fernández, F. 2003b. Revision of the myrmicine ants of the Adelomyrmex genus-group (Hymenoptera: Formicidae). Zootaxa 361: 1-52 (page 30, figs. 19-24, 33, 39-40, 73 worker described)
  • Kempf, W. W. 1972b. Catálogo abreviado das formigas da regia~o Neotropical. Stud. Entomol. 15: 3-344 (page 18, Combination in Adelomyrmex)
  • Longino, J.T. 2012. A review of the ant genus Adelomyrmex Emery 1897 (Hymenoptera, Formicidae) in Central America. Zootaxa 3456, 1–35.
  • Menozzi, C. 1931b. Contribuzione alla conoscenza del "microgenton" di Costa Rica. III. Hymenoptera - Formicidae. Boll. Lab. Zool. Gen. Agrar. R. Sc. Super. Agric. 25: 259-274 (page 269, fig. 6 worker described)
  • Smith, M. R. 1947b [1946]. Ants of the genus Apsychomyrmex Wheeler (Hymenoptera: Formicidae). Rev. Entomol. (Rio J.) 17: 468-473 (page 472, worker described)

References based on Global Ant Biodiversity Informatics

  • Ahuatzin D. A., E. J. Corro, A. Aguirre Jaimes, J. E. Valenzuela Gonzalez, R. Machado Feitosa, M. Cezar Ribeiro, J. Carlos Lopez Acosta, R. Coates, W. Dattilo. 2019. Forest cover drives leaf litter ant diversity in primary rainforest remnants within human-modified tropical landscapes. Biodiversity and Conservation 28(5): 1091-1107.
  • Branstetter M. G. and L. Sáenz. 2012. Las hormigas (Hymenoptera: Formicidae) de Guatemala. Pp. 221-268 in: Cano E. B. and J. C. Schuster. (eds.) 2012. Biodiversidad de Guatemala. Volumen 2. Guatemala: Universidad del Valle de Guatemala, iv + 328 pp
  • Dattilo W. et al. 2019. MEXICO ANTS: incidence and abundance along the Nearctic-Neotropical interface. Ecology https://doi.org/10.1002/ecy.2944
  • Fernandes, P.R. XXXX. Los hormigas del suelo en Mexico: Diversidad, distribucion e importancia (Hymenoptera: Formicidae).
  • Fernández, F. 2003. Revision of the myrmicinae ants of the Adelomyrmex genus-group. Zootaxa 361: 1-52.
  • Fernández, F. and S. Sendoya. 2004. Lista de las hormigas neotropicales. Biota Colombiana Volume 5, Number 1.
  • INBio Collection (via Gbif)
  • Johnson R. Personnal Database. Accessed on February 5th 2014 at http://www.asu.edu/clas/sirgtools/resources.htm
  • Kempf, W.W. 1972. Catalago abreviado das formigas da regiao Neotropical (Hym. Formicidae) Studia Entomologica 15(1-4).
  • Longino J. T. 2012. A review of the ant genus Adelomyrmex Emery 1897 (Hymenoptera, Formicidae) in Central America. Zootaxa 3456: 1-35
  • Longino J. T. 2013. Ants of Nicargua. Consulted on 18 Jan 2013. https://sites.google.com/site/longinollama/reports/ants-of-nicaragua
  • Longino J. T., and R. K. Colwell. 2011. Density compensation, species composition, and richness of ants on a neotropical elevational gradient. Ecosphere 2(3): 16pp.
  • Longino J. et al. ADMAC project. Accessed on March 24th 2017 at https://sites.google.com/site/admacsite/
  • Longino, J.T. 2010. Personal Communication. Longino Collection Database
  • Maes, J.-M. and W.P. MacKay. 1993. Catalogo de las hormigas (Hymenoptera: Formicidae) de Nicaragua. Revista Nicaraguense de Entomologia 23.
  • Menozzi C. 1931. Contribuzione alla conoscenza del microgenton di Costa Rica. III. Hymenoptera - Formicidae. Bollettino del Laboratorio di Zoologia Generale e Agraria della Reale Scuola Superiore d'Agricoltura. Portici. 25: 259-274.
  • Patrick M., D. Fowler, R. R. Dunn, and N. J. Sanders. 2012. Effects of Treefall Gap Disturbances on Ant Assemblages in a Tropical Montane Cloud Forest. Biotropica 44(4): 472–478.
  • Philpott, S.M., P. Bichier, R. Rice, and R. Greenberg. 2007. Field testing ecological and economic benefits of coffee certification programs. Conservation Biology 21: 975-985.
  • Schonberg, L.A., J.T. Longino, N.M. Nadkarni and S.P. Yanoviak. 2004. Arboreal Ant Species Richness in Primary Forest, Secondary Forest, and Pasture Habitats of a Tropical Montane Landscape. Biotropica 36(3):402-409.
  • Smith M. R. 1947. Ants of the genus Apsychomyrmex Wheeler (Hymenoptera: Formicidae). Revista de Entomologia (Rio de Janeiro) 17: 468-473.
  • Vásquez-Bolaños M. 2011. Lista de especies de hormigas (Hymenoptera: Formicidae) para México. Dugesiana 18: 95-133
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