North American Recent Soft-Shelled Turtles (Family Trionychidae)

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Robert G. Webb. North American Recent Soft-Shelled Turtles (Family Trionychidae)

North American Recent Soft-Shelled Turtles (Family Trionychidae)

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Отрывок из книги

Robert G. Webb

Published by Good Press, 2019

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Fig. 12. Shape of snout in T. spinifer (left, a-d, from KU 46907) and T. muticus (right, e-h, from KU 48236). Lateral views—a, e (× 1); anterior views—b, f (× 5); dorsal views—c, g (× 2.5); ventral views—d, h (× 2.5).

Tubercles or obtuse prominences occur on the anterior edge of the carapace (Fig. 8) or on the dorsal surface of the carapace. Trionyx muticus lacks tubercles, although some individuals show shallow, widely spaced wrinkles that suggest prominences on the anterior edge of the carapace. Both sexes of T. ferox have prominences, resembling flattened hemispheres, on the anterior edge of the carapace and in the nuchal region. Large females of ferox have obtuse prominences in the center of the carapace posteriorly, some of which are often arranged in longitudinal rows. The surface of the carapace in both sexes of T. ferox has small closely-set, blunt tubercles arranged in rows that resemble longitudinal ridges (most evident in juveniles).

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