Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Superfamilia Incertae sedis: †Macluritoidea
Familiae: †Archaeospiridae - Macluritidae
Name
Macluritoidea P. Fischer, 1885
The Macluritoidea, or Macluritacea as it was originally spelled, is a superfamily of hyperstrophically coiled, Upper Cambrian to Devonian, archaeogastropods,[1] or paragastropods according to Linsely and Kier (1984).[2]
Coiling is dextral, although it appears sinistral,[1] deduced from the position of the channel (presumed to be exhalent) contained in a ridge or keel (a selenizone on what is assumed to be the upper side. This is supported by the operculum of Maclurites, which corresponds to that of dextral gastropods.
According to the Treatise the Macluritaceae includes two families, the Onychochilidae and Macluritidae. Subsequent placement in the Paragastropoda[2] is based on the assumption these animals were untorted, that is they lacked the twisted viscera that are present in modern gastropods.
References
Treatise on Invertebrate Paleontology, Part I, Mollusca 1. R.C. Moore (ed); Geol Soc of America and Univ Kansas Press, 1960
Robert M. Linsely, & Willian M. Kier, 1984. The Paragastropoda: a proposal for a new class of Paleozoic Mollusca. Malacologia, v.25, no.1, pp 241-254
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