Abstract
THE pleurotomarids or slit-shells are the most primitive of existing gastropods and of unique malacological and conchological interest. They retain, in a particularly deep mantle cavity, what was probably the original molluscan organization of paired gills and associated organs1. Externally they are large top shells but with a narrow slit running far back from the outer lip of the shell. The Pleurotomariacea were originally known only as fossils, appearing in the late Upper Cambrian and attaining the height of their development during the Palaeozoic2.
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YONGE, C. Observation of the Pleurotomarid Entemnotrochus adansoniana in its Natural Habitat. Nature 241, 66–68 (1973). https://doi.org/10.1038/241066a0
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DOI: https://doi.org/10.1038/241066a0
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