Formicinae, Formicidae, Hymenoptera, Insecta, Arthropoda, Animalia
Costa Rica, Panama. Costa Rica: rainforest habitats of mid-elevation Atlantic slope, and Osa Peninsula.
Minor worker: scapes with suberect pubescence, 2-4 short erect setae spread along shaft; lateral margins of head with abundant projecting setae; mesosoma evenly arched; propodeum, meso and metathorax highly fused, sutures almost completely effaced, forming a single unit that articulates with the prothorax; dorsal profile of meso- meta- propodeal complex evenly convex, propodeum lacking differentiated dorsal and posterior faces; propodeum strongly laterally compressed, tectiform; sides of meso- meta- propodeal complex sublucid; first gastral tergite with abundant yellow appressed pubescence and abundant erect setae, appressed pubescence very long and thin; integument color generally dark red brown, with contrasting lighter red legs.
Like a woolier, shinier fastigatus, without the lighter-colored pronotum, and without the yellow bands on the gaster (or these very weakly developed and inconspicuous).
Major worker: head subquadrate; clypeus with pronounced median keel, in lateral view subtruncate, with posterior portion somewhat projecting; face granular/punctate, opaque, coarse anteriorly, becoming finer posteriorly, to nearly smooth on posterior margins of head; anterior face and lateral margins of head with dense stubble of short stiff setae.
Similar to fastigatus but more robust, shinier, woolier, and color differences of minor worker.
Similar species: fastigatus.
This species inhabits rainforest habitats. I have observed diurnal foragers on low vegetation, and I have seen three nests. All three have been from live stems of understory or forest edge plants. One nest was in two internodes of a 3m tall Cecropia sapling. The nest contained workers, soldiers, and brood, but no queen, which suggests the species may be polydomous. Another nest was in internodes of a Cecropia insignis sapling. A third nest was in the main stem of an understory tree sapling. The sapling was leaning across a rainforest trail, and we cut it with a machete to pass by. The stem was 3-4cm in diameter, and ant workers poured out when we made the cut. Further dissection revealed a nest in a clean but irregular chamber, more than a meter long, in the first two meters of the sapling trunk. Gary Hartshorn tentatively identified the sapling as Talisia in the Sapindaceae.
Forel, A. 1899. Biologia Centrali-Americana; or, contributions to the knowledge of the fauna and flora of Mexico and Central America. Insecta. Hymenoptera. 3 (Formicidae). London. 169 pp.
John T. Longino, The Evergreen State College, Olympia WA 98505 USA.email@example.com
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