O'Keefe & Agosti, 1998
This species is only known from a single collection of two specimens.
|At a Glance||• Ergatoid queen|
Oliveira & Feitosa (2019) - Postero-ventral lobe of petiole short and rounded. Subpetiolar process weakly developed. First gastral segment with prora and a dorsal protuberance on the posterior region of gaster.
This species is easily separated from Probolomyrmex petiolatus by the shape of the petiolar process, and from Probolomyrmex boliviensis by the smaller size, shorter scape, lack of a gastral collar, and similar coloration of the petiolar process and tergite. The ergatoid female has eyes and ocelli, but flight sclerites are not developed. This species is phenotypically very similar to Probolomyrmex brujitae, but differs in having a relatively larger head and longer scape.
Keys including this Species
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
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More collections are needed to confirm the presence of ergatoids in this species. It is possible the paratype was a worker that aberrantly developed eyes and ocelli.
O'Keefe and Agosti (1997) - The specimens (type material) were found in sifted debris processed through a modified Berlese-Tulgren funnel from a riparian habitat that included Ochroma pyramidale, Albizzia samen, Anacardium excelsum, Ceiba pentadra, Hymenia courbaril, Bursera simiruba, Andira inermis, Spondias mombin, Sweetenia macrophylla, Cedrela odorata, Enterolobium cyclocarpum, Hirtella racemosa, and Ardesia revoluta. The paratype represents the first record of an ergatoid female in this genus. All other known sexuals of Probolomyrmex are of the normal winged type (Taylor, 1965). Ergatoids typically occur in species with large colonies (Peeters, 1997) but it is believed that colony size is small in this genus. The only colony collection contained less than 30 individuals.
The ergatoid female has eyes and ocelli, unlike workers (O'Keefe & Agosti 1997). Body sizes are very similar.
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- guanacastensis. Probolomyrmex guanacastensis O'Keefe & Agosti, 1998: 191, figs. 1-4 (w.q.) COSTA RICA.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
HL 0.65, HW 0.39, SL 0.41, TL 0.79, CI 0.60, SI 106, (1 examined).
Oliveira & Feitosa (2019) - Similar to ergatoid queen, except by the absence of eyes and ocelli.
Oliveira & Feitosa (2019) - Ergatoid (from original description): (n=1) HL 0.63; HW 0.41; SL 0.40; WL 0.81; CI 65; SI 63.5.
Ergatoid description: Head 1.6 times longer than wide. Antennal scapes extends beyond head midlength, distance from scape apex to of head more than two times pedicel length (SI 63.5). Compound eyes and three equally sized ocelli present. Propodeal declivity laterally with narrow carina, dorsolateral teeth present, almost in same plane as dorsal profile of the propodeum in lateral view. Petiole longer than high, without teeth; anterior face of petiolar node long and inclined; posterior face short and concave; postero-ventral lobe short and rounded; subpetiolar process weakly developed. First gastral segment with prora and dorsal protuberance on posterior region of tergite, characterized by gentle elevation of the integument.
- Holotype: COSTA RICA: Guanacaste, 8.5 km NW Bagaces: Plazuela Hacienda Monteverde, 31.viii.1996, S. O’Keefe, sift leaf debris (worker) American Museum of Natural History.
- Paratype: same data as holotype, except: 1 ergatoid queen, American Museum of Natural History (see www.antweb.org; specimen CASENT0104673).
- O'Keefe, S. T.; Agosti, D. 1997. A new species of Probolomyrmex (Hymenoptera: Formicidae) from Guanacaste, Costa Rica. J. N. Y. Entomol. Soc. 105: 190-192.
- Oliveira, A.M., Feitosa, R.M. 2019. Taxonomic revision of the genus Probolomyrmex Mayr, 1901 (Hymenoptera: Formicidae: Proceratiinae) for the Neotropical Region. Zootaxa 4614 (1): 61–94 (doi:10.11646/zootaxa.4614.1.3).