Status and identity of the New Zealand Upper Triassic bivalve Monotis salinaria var. richmondiana Zittel 1864

Abstract Monotis salinaria var. richmondiana, described originally from upper Triassic (Norian) strata of the Nelson district of New Zealand, has had a very chequered taxonomic career. Its close relationship with the Siberian M. ochotica (Keyserling) was first noted by Teller, and many authors since 1886 have given it subspecific or varietal rank within M. ochotica, or suppressed it in favour of that species. Others have regarded it as specifically distinct and have even identified infraspecific variations. At no time since its introduction has there been a nomenclature applied uniformly by workers. This nomenclatural instability has resulted from many factors: Zittel's figures are inadequate and have been assumed to be all of a single taxon; all or nearly all strongly ribbed neozelanic Monotis have been lumped into M. richmondiana; Ichikawa selected as lectotype a sub-adult specimen not included amongst Zittel's figured valves; the stratigraphy of Monotis sequences in New Zealand has not previously been ...

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