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Observations on a Commensal Relationship of the Microhylid Frog Chiasmocleis ventrimaculata and the Burrowing Theraphosid Spider Xenesthis immanis in Southeastern Peru

Reginald B. Cocroft and Keith Hambler
Biotropica
Vol. 21, No. 1 (Mar., 1989), pp. 2-8
DOI: 10.2307/2388434
Stable URL: http://www.jstor.org/stable/2388434
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Observations on a Commensal Relationship of the Microhylid Frog Chiasmocleis ventrimaculata and the Burrowing Theraphosid Spider Xenesthis immanis in Southeastern Peru
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Abstract

A commensal relationship of Chiasmocleis ventrimaculata and Xenesthis immanis was studied over a 3-mo period at Tambopata Reserved Zone, Peru. Observations indicate that both species simultaneously utilize the same diurnal retreats and forage in overlapping areas. Feeding trials suggest that Xenesthis readily feed on some species of anurans, and observations implicate the role of chemical defenses in preventing Xenesthis predation on Chiasmocleis. The commensalism is similar to that of ecologically similar terrestrial frogs and burrowing spiders in North America.

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