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New Populations of the Fresh-Water Limpets, Ferrissia walkeri (Pilsbry and Ferriss) and Laevapex fuscus (C. B. Adams) (Pulmonata: Ancylidae) in North Central Texas

Robert F. McMahon and Archibald W. Hopkins
The Southwestern Naturalist
Vol. 22, No. 3 (Jun. 15, 1977), pp. 353-357
Stable URL: http://www.jstor.org/stable/30054802
Page Count: 5
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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.
New Populations of the Fresh-Water Limpets, Ferrissia walkeri (Pilsbry and Ferriss) and Laevapex fuscus (C. B. Adams) (Pulmonata: Ancylidae) in North Central Texas
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Abstract

Recent collections have revealed the presence of populations of the fresh-water ancylid snails Ferrissia walkeri and Laevapex fuscus (Pulmonata: Basommatophora) in a small manmade pond in North Central Texas. Laevapex fuscus is known from only 5 other localities in Texas and this report of F. walkeri is the first for the state. A large proportion of adult individuals in the F. walkeri population harbored cercariae of an unidentified trematode while cercariae were never observed in specimens of L. fuscus collected from the same habitat.

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