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Species: Pheidole caltrop   Wilson, 2003 

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Taxonomic History (provided by Barry Bolton, 2020)

Pheidole caltrop Wilson, 2003A: 270, figs. (s.w.) PANAMA. Neotropic. AntCat AntWiki HOL


  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: Costa Rica, Panama
  Biogeographic regions (According to curated Bioregion/Taxon lists):

Distribution Notes:

Costa Rica, Panama. Costa Rica: Atlantic lowlands.


Natural History:

Arboreal in lowland wet forest; nesting in dead branches.


J. Longino, 26 Apr 2014: Pheidole caltrop (Panama), P. floricola (Costa Rica to Honduras), P. gilva (Peru), and P. pilispina (Panama) are very similar. The P. pilispina and P. gilva type major workers have head shape and HW intermediate between P. caltrop and P. floricola. Minor workers of P. caltrop, P. gilva, and P. pilispina look indistinguishable to me. Minor workers of P. floricola have a mix of foveolate and shiny sculpture on the face; the other three are uniformly foveolate. Pheidole floricola is an arboreal species, and I suspect P. gilva, P. pilispina, and P. caltrop are as well. There is no evidence of sympatry among any of these forms.

Taxonomic Treatment (provided by Plazi)

Treatment Citation: Wilson, E. O., 2003, Pheidole in the New World. A dominant, hyperdiverse ant genus., Cambridge, MA: Harvard University Press

Pheidole caltropHNS new species

Types Mus. Comp. Zool. Harvard.

Etymology ML caltropHNS, a four-pointed weapon placed on the ground to impede movement.

Diagnosis A unique member of the fallaxHNS group characterized as follows.

Major: yellow; occiput, genae, and promesonotal dorsum rugoreticulate; large "sharkfin" protrusion on humerus extends beyond the

boundaries of the rest of the pronotum when viewed from above; dorsum of postpetiolar node carinulate.

Minor: large "sharkfin" angle protrudes from humerus; all of body except gaster foveolate and opaque; very thin nuchal collar


Measurements (mm) Holotype major: HW 1.22, HL 1.18, SL 0.64, EL 0.14, PW 0.62. Paratype minor: HW 0.60, HL 0.66, SL 0.66, EL 0.10, PW 0.42. color Major: concolorous dark yellow. Minor: concolorous medium yellow.

range Known only from the type locality.

biology "From large thorns hollowed out on living tree" (A. E. Emerson, collection note 13 April 1935).

figure Upper: holotype, major. Lower: paratype, minor. PANAMA: Barro Colorado Island (Alfred E. Emerson). Scale bars = 1 mm.

Specimen Habitat Summary

Found most commonly in these habitats: 1 times found in primary rainforest.

Elevations: collected at 50 m

Type specimens: paratype Pheidole caltrop: casent0644180, casent0644181, casent0644182, jtlc000016334, jtlc000016335

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