Pleurotomarioidea

	Pleurotomarioidea Pleurotomarioidea is a superfamily of small to large marine gastropods included in the order Pleurotomariida of the subclass Vetigastropoda. These are the slit shells, originally named Pleurotomariacea, in keeping with the convention for naming superfamilies at the time. This updated version of the name for the taxon is usually used by students of the living Mollusca. Paleontologists often still use the name Pleurotomariacea instead. Evolutionary history Forming the first evidence of crown-group gastropods when they appeared in the Upper Cambrian, the fossil record of the Pleurotomarioideans has no substantial gaps until today. The group took quite a hit at the Cretaceous–Paleogene boundary (K–T boundary), with only the Pleurotomariidae surviving the Cretaceous–Paleogene extinction event – and then only in deep waters. Living representatives of the group were first discovered in the mid-19th century, and their unusual mix of primitive and derived characte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Trochotomidae Trochotomidae is an extinct family (biology), family of fossil sea snails, marine (ocean), marine gastropod molluscs in the superfamily Pleurotomarioidea (according to the Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005), taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). This family has no subfamilies. Genera Genera within the family Trochotomidae include: * ''Trochotoma'', the type genus] References Paleobiology database info Trochotomidae, Gastropod families {{paleo-gastropod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Vetigastropoda Vetigastropoda is a major taxonomic group of sea snails, marine gastropod mollusks that form a very ancient lineage. Taxonomically the Vetigastropoda are sometimes treated as an order, although they are treated as an unranked clade in Bouchet and Rocroi, 2005. Vetigastropods are considered to be among the most primitive living gastropods, and are widely distributed in all oceans of the world. Their habitats range from the deep sea to intertidal zones. Many have shells with slits or other secondary openings. One of their main characteristics is the presence of intersected crossed platy shell structure. Most vetigastropods have some bilateral asymmetry of their organ systems. Description Vetigastropods range in size from approximately 0.08 in (2 mm) long in the case of Scissurelloidea or Skeneoidea, to more than 11.8 in (300 mm) in length, as with the Haliotoidea. External colours and patterns are typically drab, but such groups as the Tricolioidea and some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Pleurotomariacea Pleurotomariacea is one of two names that are used for a taxonomic superfamily of sea snails that are an ancient lineage and are well represented in the fossil record. The name Pleurotomariacea is used by paleontologists, who, because they usually have only the hard parts of mollusks to study, often use a slightly different scheme of classification from that used by scientists who study living mollusks. The name Pleurotomariacea is based on Swainson, 1840 (Pleurotomariae) and was described in 1960 in the Treatise on Invertebrate Paleontology, (I197)Treatise on Invertebrate Paleontology Part I, R.C. Moore (ed) Geol Soc of America and Univ. Kansas Press, 1960. The taxon was established for mostly conispiral, but also discoidal and auriform (ear-like) shells which have a nacreous, aragonite, inner layer. The Pleurotomariacea, now often seen as Pleurotomarioidea, has been included in the Archaegastropoda. although more recent classifications put it in a more restricted sense in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Phymatopleuridae Phymatopleuridae is an extinct family of fossil sea snails, marine gastropod mollusc Mollusca is a phylum of protostome, protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant taxon, extant species of molluscs are recognized, making it the second-largest animal phylum ...s in the superfamily Pleurotomarioidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). This family has no subfamilies. Genera Genera within the family Phymatopleuridae include: * '' Phymatopleura'', the type genus References External links Paleobiology Database info Prehistoric gastropods Gastropod families {{paleo-gastropod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Pleurotomariidae Pleurotomariidae, common name the "slit snails", is a family of large marine gastropods in the superfamily Pleurotomarioidea of the subclass Vetigastropoda. This family is a very ancient lineage; there were numerous species in the geological past. The genus includes several hundred fossil forms, mostly Paleozoic. It is one of the oldest gastropod families, commencing in the Cambrian. The superfamily is currently represented by a group of species that live only in deep water. This family has no subfamilies. The first living specimens of a species in this family, '' Perotrochus quoyanus'', were dredged in 1879 in deep water off the West Indies by the "Blake" expedition of William Healey Dall. Description The shell has a trochoidal shape. It is nacreous within. It is umbilicate or imperforate, having a deep slit or sinus in the outer superior margin of the peristome, which serves the purpose of an exhalant phase of respiration., and leaves on the corresponding part of the whorl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Zygitidae †Zygitidae is an extinct family of fossil sea snail Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguishe ...s, marine (ocean), marine gastropod molluscs in the clade Vetigastropoda. This family has no subfamilies. Genera Genera within Zygitidae include: * †''Zygites,'' Kittl 1891 * ''†Kokenella'', Kittl 1891 * †''Cancellotomaria,'' Karapunar & Nützel 2021 References Zygitidae, Gastropod families {{paleo-gastropod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Taxonomy Of The Gastropoda (Bouchet & Rocroi, 2005) The taxonomy of the Gastropoda as it was revised in 2005 by Philippe Bouchet and Jean-Pierre Rocroi is a system for the scientific classification of gastropod mollusks (Gastropods are a taxonomic class of animals which consists of snails and slugs of every kind, from the land, from freshwater, and from saltwater). The paper setting out this taxonomy was published in the journal '' Malacologia''. The system encompasses both living and extinct groups, as well as some fossils whose classification as gastropods is uncertain. The Bouchet & Rocroi system was the first complete gastropod taxonomy that primarily employed the concept of clades, and was derived from research on molecular phylogenetics; in this context a clade is a "natural grouping" of organisms based upon a statistical cluster analysis. In contrast, most of the previous overall taxonomic schemes for gastropods relied on morphological features to classify these animals, and used taxon ranks such as order, superorder ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Portlockiellidae Portlockiellidae is an extinct family of gastropods in the clade Vetigastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). This family has no subfamilies. Genera Genera within the family Portlockiellidae include: The Paleobiology Database, accessed 10 April 2009. * '' Portlockiella'' Knight, 1945 - the type genus In biological taxonomy, the type genus (''genus typica'') is the genus which defines a biological family and the root of the family name. Zoological nomenclature According to the International Code of Zoological Nomenclature ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Polytremariidae Polytremariidae is an extinct family of gastropods in the clade Vetigastropoda Vetigastropoda is a major taxonomic group of sea snails, marine gastropod mollusks that form a very ancient lineage. Taxonomically the Vetigastropoda are sometimes treated as an order, although they are treated as an unranked clade in Bouch ... (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). This family has no subfamilies. Gastropod families {{paleo-gastropod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Kittlidiscidae Kittlidiscidae is an extinct family of Middle Triassic gastropods in the superfamily Pleurotomarioidea, named to contain the genus ''Kittlidiscus''Treatise on Invertebrate Paleontology Part I, R.C. Moore (ed) Geol Soc of America and Univ. Kansas Press, 1960. and included in the Vetigastropoda Vetigastropoda is a major taxonomic group of sea snails, marine gastropod mollusks that form a very ancient lineage. Taxonomically the Vetigastropoda are sometimes treated as an order, although they are treated as an unranked clade in Bouch .... Note that Bouchet & Rocroi, 2005 gives Vetigastropoda simply as a clade, which not being paraphyletic, it also is, leaving taxonomic ranking to a future date. Other gastropod classifications, including those subsequent, have determined that the Vetigastropoda is a superorder. Genera The Kittlidiscidae includes the genus ''Kittlidiscus''. References Gastropod families {{paleo-gastropod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Catantostomatidae Catantostomatidae is an extinct family of marine gastropods included in the Vetigastropoda and placed in the superfamily Pleurotomarioidea Pleurotomarioidea is a superfamily of small to large marine gastropods included in the order Pleurotomariida of the subclass Vetigastropoda. These are the slit shells, originally named Pleurotomariacea, in keeping with the convention for na ....Treatise on Invertebrate Paleontology Part I, R.C. Moore (ed) Geol Soc of America and Univ. Kansas Press, 1960. Genera Catantostomatidae was established for the genus ''Catantostoma''. References Middle Devonian first appearances Middle Devonian extinctions Gastropod families {{paleo-gastropod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Rhaphischismatidae Rhaphischismatidae is an extinct family of fossil sea snails, marine gastropod molluscs in the superorder Vetigastropoda. They date from the Lower Carboniferous (Mississippian). The family contains a single genus, ''Raphischisma''. In the Bouchet & Rocroi, 2005), this family is assigned to the Pleurotomariacea.Treatise on Invertebrate Paleontology Part I, R.C. Moore (ed) Geol Soc of America and Univ. Kansas Press, 1960. Genera ''Raphischisma'' is the only known genus. Its description is that of the family. Description ''Rhaphycasma'' is characterized by a discoidal shell with a rounded periphery, depressed spire, umbilical callus formed by the inward extension of the lower aperture lip, and a deep, narrow slit, that extends along the upper surface, near the upper suture. The unique features of the lower lip The lips are a horizontal pair of soft appendages attached to the jaws and are the most visible part of the mouth of many animals, including humans. Mammal lips ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]