Monoplacophora

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Monoplacophora

a class of Mollusca which contains Neopilina, a limpet-like deep-sea form, which is known mainly from extinct forms.
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Amongst lower Palaeozoic univalve molluscs, muscle scars are well known in cephalopods (Mutvei 1957, 2002; Kroger & Mutvei 2005) and in the rapidly expanding, cap-shaped or slightly coiled shells of monoplacophoran molluscs, such as the tergomyans Tryblidium Lindstrom, 1880 and Pilina Koken & Perner, 1925 (Lindstrom 1884; Peel 1977a) or the cyrtonellids Cyrtolites Conrad, 1838, Cyrtonella Hall, 1879 and Yochelsonellis Horny, 1966 (Horny 1961, 1962, 1963, 1997a, 2002, 2005, 2009; Rollins 1969).
Hausdorf et al., "Revised classification, nomenclator and typification of gastropod and monoplacophoran families," Malacologia, vol.
The taxonomic relationship of Jinonicella, as well as the broadly similar microfossil Janospira Fortey & Whittaker, 1976, described from the Ordovician of Spitsbergen, is obscure; whether it is a polychaete (Yochelson 1977), an archaeogastropod (Pokorny 1978a, 1978b), a monoplacophoran, i.e.
Furthermore, developmental descriptions of monoplacophoran larvae, which are entirely lacking, are desired.
Regular aragonitic nacres occur in the gastropods, cephalopods, and bivalves, all of which may have evolved from nacreous monoplacophoran ancestors.
Evidence for a Glade composed of molluscs with serially repeated structures: Monoplacophorans are related to chitons.
Evidence for a clade composed of molluscs with serially repeated structures: Monoplacophorans are related to chitons.
It possessed a stiff but unmineralized integument, and is associated with traces of scratching which match those created by modern algae-rasping molluscs such as chitons and monoplacophorans. Kimberella is known from several Ediacaran localities; more than eight hundred specimens have been obtained from the White Sea region of Russia.