''Perotrochus'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of large

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 with

gill A gill () is a respiration organ, respiratory organ that many aquatic ecosystem, aquatic organisms use to extract dissolved oxygen from water and to excrete carbon dioxide. The gills of some species, such as hermit crabs, have adapted to allow r ...

s and an operculum, marine

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The ...

s in the family

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 p ...

, the slit snails, (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).

Description

The shell has a conical shape. The base is not umbilicated. The

whorl A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). In nature File:Photograph and axial plane floral diagra ...

s are striate or granulate. The anal fasciole is submedian or below the middle. The slit is short.

Species

Extant

According to the

World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive catalogue and list of names of marine organisms. Content The content of the registry is edited and maintained by scien ...

(WoRMS), the following species with valid names are included within the genus ''Perotrochus'':WoRMS : Perotrochus; accessed : 9 September 2010
/ref> * † '' Perotrochus allani'' Marwick, 1928 * '' Perotrochus amabilis'' (

Bayer Bayer AG (English: , commonly pronounced ; ) is a German multinational pharmaceutical and biotechnology company and is one of the largest pharmaceutical companies and biomedical companies in the world. Headquartered in Leverkusen, Bayer' ...

, 1963) * '' Perotrochus anseeuwi'' Kanazawa & Goto, 1991 * '' Perotrochus atlanticus'' Rios & Matthews, 1968 * '' Perotrochus caledonicus'' Bouchet & Métivier, 1982 * '' Perotrochus charlestonensis'' Askew, 1987 * '' Perotrochus deforgesi'' Métivier, 1990 * '' Perotrochus lucaya''

, 1965 * † '' Perotrochus maoriensis'' (Wilckens, 1922) * † '' Perotrochus marwicki'' C. A. Fleming, 1970 * '' Perotrochus maureri'' Harasewych & Askew, 1993 * '' Perotrochus metivieri'' Anseeuw & Goto, 1995 * '' Perotrochus oishii'' (Shikama, 1973) * '' Perotrochus pseudogranulosus'' Anseeuw, Puillandre, Utge & Bouchet, 2015 * '' Perotrochus quoyanus'' (

Fischer Fischer is a German occupational surname, meaning fisherman. The name Fischer is the fourth most common German surname. The English version is Fisher. People with the surname A * Abraham Fischer (1850–1913) South African public official * ...

& Bernardi, 1856) * '' Perotrochus sunderlandorum'' Petuch & Berschauer, 2017 * '' Perotrochus tosatoi'' Anseeuw, Goto & Abdi, 2005 * '' Perotrochus vicdani'' Kosuge, 1980 * '' Perotrochus wareni'' Anseeuw, Puillandre, Utge & Bouchet, 2015 ;Species brought into synonymy: * ''Perotrochus africanus'' (Tomlin, 1948): synonym of '' Bayerotrochus africanus'' (Tomlin, 1948) * ''Perotrochus boucheti'' Anseeuw & Poppe, 2001: synonym of '' Bayerotrochus boucheti'' (Anseeuw & Poppe, 2001) * ''Perotrochus diliculum'' Okutani, 1979: synonym of '' Bayerotrochus diluculum'' (Okutani, 1979) * ''Perotrochus gemma'' F. M. Bayer, 1965: synonym of ''Perotrochus quoyanus quoyanus'' (P. Fischer & Bernardi, 1856) * ''Perotrochus gotoi'' Anseeuw, 1990: synonym of '' Mikadotrochus gotoi'' (Anseeuw, 1990) * ''Perotrochus hirasei'' (Pilsbry, 1903): synonym of ''

Mikadotrochus hirasei ''Mikadotrochus hirasei'', common name the emperor's slit shell, is a species of large deepwater sea snail, a marine gastropod mollusk in the family Pleurotomariidae, the slit snails. Description The shell has a typical trochoid shape with a sp ...

'' (Pilsbry, 1903) * ''Perotrochus indicus'' Anseeuw, 1999: synonym of '' Bayerotrochus indicus'' (Anseeuw, 1999) * † ''Perotrochus masoni'' P. A. Maxwell, 1978: synonym of † '' Bayerotrochus masoni'' (P. A. Maxwell, 1978) * ''Perotrochus midas'' Bayer, 1965: synonym of '' Bayerotrochus midas'' (Bayer, 1965) * ''Perotrochus poppei'' Anseeuw, 2003: synonym of '' Bayerotrochus poppei'' Anseeuw, 2003 * ''Perotrochus pyramus''

, 1967: synonym of '' Bayerotrochus pyramus'' (Bayer, 1967) * ''Perotrochus tangaroanus'' Bouchet & Métivier, 1982: synonym of '' Bayerotrochus tangaroanus'' (Bouchet & Métivier, 1982) * ''Perotrochus teramachii'' Kuroda, 1955: synonym of '' Bayerotrochus teramachii'' (Kuroda, 1955) * ''Perotrochus westralis'' (Whitehead, 1987): synonym of '' Bayerotrochus westralis'' (Whitehead, 1987)

Fossil

* †''P. allani'' , Red Bluff Tuff, New Zealand * †''P. brachoi'' , Otekaike Limestone, New Zealand * †''P. eocenicus'' , Kattachi Formation, Japan * †''P. isseli'' ,

Sassello Sassello (; locally ) is a ''comune'' (municipality) in the Province of Savona in the Italian region Liguria, located about west of Genoa and about north of Savona in the northern side of the Ligurian Apennines. It is the birthplace of Blessed ...

(SV), Tertiary Piedmont Basin, Italy * †''P. masoni'' , Otekaike Limestone, New Zealand (synonym of † ''Bayerotrochus masoni'' (P. A. Maxwell, 1978)) * †''P. sismondai'' , Alzey Formation, Germany * †''P. (Perotrochus) hanoverensis'',

Castle Hayne Formation The Castle Hayne Limestone (also called the Castle Hayne Formation) is a middle Eocene-aged geologic formation in North Carolina, USA. It consists of cobble to pebble sized clasts, usually rounded, coated with phosphate and glauconite in a limest ...

, North Carolina * †''P. (Entemnotrochus)'', Capay Formation, California and Swan Cay Formation, Panama * †''Pleurotomaria (Entemnotrochus) baldwini'', ''P. (E.) schencki'' & ''P. (E.) siletzensis'',

Siletz River Volcanics The Siletz River Volcanics, located in the Oregon Coast Range, United States, are a sequence of basaltic pillow lavas that make up part of Siletzia.Fischer, P. (1880-1887). Manuel de conchyliologie et de paléontologie conchyliologique, ou histoire naturelle des mollusques vivants et fossiles suivi d'un Appendice sur les Brachiopodes par D. P. Oehlert. Avec 23 planches contenant 600 figures dessinées par S. P. Woodward.. Paris: F. Savy. Published in 11 parts (fascicules), xxiv + 1369 pp., 23 pls
{{Taxonbar, from=Q3127107 Pleurotomariidae