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Abstract
The scope and species content of the pterioid bivalve Monotis Bronn with almost global distribution in Norian (Late Triassic) marine strata are reconsidered. Various infra-generic groupings have been proposed in the last 50 years and all have been subject to some criticism. A scheme which allocates all species to one of eight subgenera (Monotis, Entomonotis Marwick, Eomonotis Grant-Mackie, Inflatomonotis Grant-Mackie, Maorimonotis Grant-Mackie, Pacimonotis Grant-Mackie & Silberling, Baikalomonotis Bychkov and Praemonotis Bychkov) is favoured here and, in line with current trends, these eight are afforded generic status. There is also a growing move away from recognition of subspecies and, when applied here, allows most to be accepted at species level with a few names synonymised.
Acknowledgements
Louise Cotterall, University of Auckland School of the Environment, is gratefully acknowledged for the illustrations. Thanks are due to: Alan Beu, GNS Science, Lower Hutt for helpful comments on the modern understanding of the subspecies issue and for constructive criticism of the text; Hamish Campbell, GNS Science; Neville Hudson, Auckland University School of the Environment; Donald MacFarlan, New Plymouth for helpful comments on earlier versions of the manuscript; an anonymous reviewer; and Kristin Garbett and Pauline Muir, GNS Science library, for the provision of references.Associate Editor: Associate Professor Kathy Campbell.
