Pheidole otisi Wilson 2003

Formicidae, Hymenoptera, Insecta, Arthropoda, Animalia

worker face view

worker lateral view

major face view

major lateral view


Minor worker: head length 0.40mm, head width 0.38mm, scape length 0.30mm, Webers length 0.44mm (n=1). Head flattened behind, with median excavation; mesonotal suture absent; promesonotum somewhat box-like in profile; propodeal spines short, spiniform; humeri and sides of pronotum somewhat produced, such that posterolateral face of pronotum slopes inward; face and mesosoma largely foveolate; patch on posterolateral pronotum smooth and shining; posterior face of propodeum smooth and shining; first gastral tergum smooth and shining; dorsal pilosity sparse, short, moderately stiff; color orange.

Major worker: head length 0.68mm, head width 0.59mm, scape length 0.29mm (n=1). Face foveolate, overlain with faint longitudinal rugae anteriorly, reticulate rugae posteriorly; antennal scrobes weakly present in the form of shallow depressions beneath apices of scapes; hypostomal margin gently curved, with median tooth and pointed lateral teeth about one third distance from midline to recessed teeth flanking mandible bases; dorsal pilosity sparse; head with very short, suberect to subdecumbent setae projecting from sides of head in face view.

Variation: minor workers from Carara tentatively placed here are brown.


Costa Rica (Atlantic and southern Pacific lowlands).

Natural History

Inhabits wet forest leaf litter; nests in dead wood; forages on ground and in low vegetation.

Selected Records

Carara Biological Reserve: Winkler sample.

Osa Peninsula: Winkler samples, at baits; on extrafloral nectaries of Passiflora pittieri.

Braulio Carrillo National Park, 600m.

La Selva: under bark on fallen log.

Page authors:

John T. Longino, The Evergreen State College, Olympia WA 98505 USA.

Stefan Cover, Museum of Comparative Zoology, Harvard University, Cambridge MA 02138 USA.

Date of this version: 2 September 2003.
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