Abstract

Employing criteria proposed as an objective basis for the "speciation" of fossil holothurian sclerite morphogroups, the differentiating continuous and discontinuous variates of 1,169 topotype specimens of Rhabdotites, from the Oxfordian (Upper Jurassic) strata of Redcliff, near Weymouth, Dorset, England, are subjected to univariate statistical analysis. The discontinuous variate of pustule number is shown to be a nondifferentiating "specific" character, and the "species" (qua parataxa) Rhabdotites dorsetensis Hodson, Harris and Lawson, R. divergens Hodson, Harris and Lawson, R. bifidus Hodson, Harris and Lawson, R. tridens Hodson, Harris and Lawson, and R. irregularis Hodson, Harris and Lawson, are placed in the single "species" (qua parataxon) R. dorsetensis Hodson, Harris and Lawson, which is revised.

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