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Systematic Position of Eldonia ludwigi Walcott

J. Wyatt Durham
Journal of Paleontology
Vol. 48, No. 4 (Jul., 1974), pp. 750-755
Stable URL: http://www.jstor.org/stable/1303225
Page Count: 6
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Systematic Position of Eldonia ludwigi Walcott
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Abstract

The numerous original specimens of Eldonia ludwigi Walcott, 1911, have been re-examined, a lectotype designated, and the systematic affinities re-evaluated. The presence of "suspension points" at the contact of the mesenteries with the gut indicates that the latter is an internal structure suspended within a coelom. This, together with the coiled ("torted") character of the gut indicates that Eldonia ludwigi is an echinoderm and not a siphonophore as suggested by Madsen and others. The presence of oral tentacles suggests that it was a holothurian as originally concluded by Walcott.

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