Macluritoidea
Encyclopedia
The Macluritoidea,Macluritacea as originally spelled is a superfamily of hyperstrophically coiled, Upper Cambrian to Devonian, archaeogastropods
, or paragastropods according to Linsely and Kier (1984).
Coiling is dextral, although it appears sinstral, deduced from the position of the channel (presumed to be exhalent) contained in a ridge or keel on what is assumed to be the upper side. This is supported by the opurculum of Maclurites which corresponds to that of dextral gastropods.
According to the Treatise
the Macluritaceae includes two families, the Onychochilidae and Macluridae. Subsequent placement in the Paragastropoda is based on the assumption these animals were untorted, that is lacked twisted viscera.
Archaeogastropoda
Archaeogastropoda was a taxonomic order of sea snails used in older classifications of gastropods, i.e. snails and slugs. Archeogastropoda are marine prosobranch gastropod mollusks, mainly herbivores, typically having two gills and a double-chambered heart, with the eggs and sperm discharged...
, or paragastropods according to Linsely and Kier (1984).
Coiling is dextral, although it appears sinstral, deduced from the position of the channel (presumed to be exhalent) contained in a ridge or keel on what is assumed to be the upper side. This is supported by the opurculum of Maclurites which corresponds to that of dextral gastropods.
According to the Treatise
Treatise on Invertebrate Paleontology
The Treatise on Invertebrate Paleontology published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and covering every phylum, class, order, family, and genus of fossil and...
the Macluritaceae includes two families, the Onychochilidae and Macluridae. Subsequent placement in the Paragastropoda is based on the assumption these animals were untorted, that is lacked twisted viscera.