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The Coccidia (Apicomplexa: Eimeriidae) of Crocodylia, with Descriptions of Two New Species from Alligator mississippiensis (Reptilia: Alligatoridae) from Texas

Chris T. McAllister and Steve J. Upton
The Journal of Parasitology
Vol. 76, No. 3 (Jun., 1990), pp. 332-336
DOI: 10.2307/3282660
Stable URL: http://www.jstor.org/stable/3282660
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.
The Coccidia (Apicomplexa: Eimeriidae) of Crocodylia, with Descriptions of Two New Species from Alligator mississippiensis (Reptilia: Alligatoridae) from Texas
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Abstract

During early September 1989, fecal and intestinal contents were collected from 30 American alligators, Alligator mississippiensis, in southeastern Texas. Twenty (67%) of the alligators harbored coccidia and 2 new species of Eimeria are described. Oocysts of Eimeria alligatori n. sp. were found in 15 of 30 (50%) alligators and are ellipsoid, 25.3 x 20.0 (22-31 x 18-22) µm; shape index 1.3 (1.1-1.6). A spheroid oocyst residuum and polar granule are present, but a micropyle is absent. Sporocysts are elongate-ovoid, 14.3 x 8.1 (12-15 x 7-9) µm; shape index 1.8 (1.6-2.1). An ovoid sporocyst residuum and slightly pointed Stieda body are present, but a substieda body is absent. Oocysts of Eimeria hatcheri n. sp. were found in 14 of 30 (47%) alligators and are spheroid or subspheroid, 16.1 x 13.7 (12-18 x 12-15) µm; shape index 1.2 (1.0-1.4). A subspheroid oocyst residuum and 1 (rarely 2) polar granule(s) is present, but a micropyle is absent. Sporocysts are ellipsoid, 10.5 x 5.8 (10-13 x 5-6) µm; shape index 1.8 (1.5-2.1). A spheroid-subspheroid sporocyst residuum and a minute Stieda body are present, but a substieda body is absent. Nearly one-half of the A. mississippiensis had multiple infections of both eimerians. A summary of the coccidia (Eimeriidae) of Crocodylia is presented.

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