Pheidole susannae

Longino, J. T., 2009, Additions to the taxonomy of New World Pheidole (Hymenoptera: Formicidae)., Zootaxa 2181, pp. 1-90 : 79-80

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Pheidole susannae


Pheidole susannae View in CoL View at ENA   HNS

Pheidole susannae Forel, 1886   HNS : xliii. Syntype major, minor worker: Guatemala, Retalhuleu (Stoll) [ MHNG] (examined).

Pheidole susannae r. obscurior Forel, 1886   HNS : xliv. Lectotype major worker (here designated, labeled with unique pin code JTLC 000015316) and associated paralectotype minor worker: Brazil, Rio de Janeiro (Naegeli) [ MHNG] (examined). Forel, 1893: 410: description of queen, male. Wilson, 2003: 330: raised to species, senior synonym of P. partita   HNS . New Synonymy.

Pheidole partita Mayr, 1887: 590   HNS (major worker), 604 (minor worker): Brazil, Rio de Janeiro (Naegeli). Wilson, 2003: 330: junior synonym of P. obscurior   HNS . New Synonymy.

Pheidole susannae r. atricolor Forel, 1901a: 356   HNS . Syntype major,minor worker, gyne, male: Colombia, Magdalena, San Antonio (Forel) [ MHNG] (examined). Wilson, 2003: 351: junior synonym of P. susannae   HNS .

Pheidole incisa subsp. evoluta Borgmeier, 1929: 204   HNS , pl. 6, fig. 3. Syntype major, minor worker: Brazil, Rio Grande do Sul, Porto Alegre, 30 Nov 1924 (Buck). Kempf, 1964: 63: junior synonym of P. susannae   HNS .

Geographic Range

Southern Mexico to southern Brazil.


This species occurs in various habitats, including highly disturbed areas (city parks), seasonal dry forest, mature lowland rainforest, and second growth rainforest. It can occur on the ground or in the canopy. Workers readily recruit to baits, and major workers often recruit along with minor workers. Nests are in small cavities and appear to be somewhat opportunistically inhabited.


Although Wilson (2003) illustrated a "Lectotype major worker," among the type material of P. susannae   HNS borrowed from MHNG for this study, none was labeled Lectotype.

The syntypes of P. susannae   HNS and P. obscurior   HNS are very similar in all respects but color. The syntypes of P. susannae   HNS are yellow; those of P. obscurior   HNS are dark brown. The key in Wilson separates the species on relative scape length in the major, with P. obscurior   HNS purported to have relatively longer scapes. However, measurements of the types reveal that the lectotype of P. obscurior   HNS has a SI that is actually lower than that of syntypes of P. susannae   HNS .

Pheidole susannae   HNS is a relatively common species found in disturbed habitats throughout the Neotropics. It appears quite uniform in morphology across its range. With the exception of the type series, all the material examined to date has been dark red brown. The types are inexplicably yellow. A yellow form may be discovered in Guatemala (the type locality), but given that the types were collected in the nineteenth century with uncertain methods of preservation, there is the possibility that the coloration is a preservation artifact.


Switzerland, Geneva, Museum d'Histoire Naturelle


John T. Longino













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