Abstract
Two new species of Cephalocarida, Sandersiella calmani from shallow Peruvian waters, and S. bathyalis from deep water off Southwest Africa, allow realistic determination of the generic characteristics of this previously monotypic genus. This re-evaluation of Sandersiella necessitates rediagnosis of the other two genera, Hutchinsoniella and Lightiella. Full enumeration of known localities shows the cephalocarids to have a disjunct, cosmopolitan distribution with broad environmental range. Nevertheless, the morphological range of this subclass is quite limited. This pattern is like that of other primitive arthropods, including the Mystacocarida, Leptostraca, and Xiphosura.
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