Pyramidelloidea is a superfamily of mostly very small

sea snail Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...

s, marine

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...

s and micromollusks within the clade

Panpulmonata Panpulmonata is a taxonomic clade of snails and slugs in the clade Heterobranchia within the clade Euthyneura. Panpulmonata was established as a new taxon by Jörger et al. in October 2010. The older name "Pulmonata" referred to a group of gas ...

. This is a voluminous

taxon In biology, a taxon (back-formation from ''taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular nam ...

: above the species level close to 400 named taxa are referred to this gastropod superfamily. Pyramidelloidea has both

fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...

and recent members. They live as ectoparasites on

bivalve Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bival ...

molluscs and

polychaete Polychaeta () is a paraphyletic class of generally marine annelid worms, commonly called bristle worms or polychaetes (). Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made ...

worms, and have a sharp, piercing stylet instead of a radula.

Distribution

This taxon is found worldwide.

Taxonomy

1999 taxonomy

Taxonomy by Schander, Van Aartsen & Corgan (1999): *Superfamily Pyramidelloidea Gray, 1840 **Family

Amathinidae Amathinidae, is a taxonomic family mostly consisting of small and minute sea snails, marine heterobranch gastropod molluscs or micromolluscs in the superfamily Pyramidelloidea. Together with Pyramidellidae, Ebalidae, Turbonillidae, Odostomid ...

Ponder, 1987 **Family

Ebalidae Murchisonellidae is a taxonomic family of sea snails, marine opisthobranch gastropod mollusks in the superfamily Murchisonelloidea.Bouchet, P. (2015). Murchisonellidae Casey, 1904. Accessed through: World Register of Marine Species at http://ww ...

Warén, 1994 - synonym: Anisocyclidae van Aartsen, 1995 **Family Odostomiidae Pelseneer, 1928 ***Subfamily Odostomiinae Pelseneer, 1928 ***Subfamily Chrysallidinae Saurin, 1958 ***Subfamily Odostomellinae Saurin, 1958 ***Subfamily Cyclostremellinae Moore, 1966 **Family

Pyramidellidae Pyramidellidae, common name the pyram family, or pyramid shells, is a voluminous taxonomic family of mostly small and minute ectoparasitic sea snails, marine heterobranch gastropod molluscs. The great majority of species of pyrams are micr ...

J. E. Gray, 1840 ***Subfamily Pyramidellinae J.E. Gray, 1840 ***Subfamily Sayellinae Wise, 1996 **Family

Syrnolidae Syrnolininae is a subfamily of minute parasitic sea snails, marine heterobranch gastropod molluscs in the family Pyramidellidae, the pyrams and their allies. Taxonomy According to the taxonomy of Ponder & Lindberg (1997), this was one of eleve ...

Saurin, 1958 ***Subfamily Syrnolinae Saurin, 1958 ***Subfamily Tiberiinae Saurin, 1958 **Family Turbonillidae Bronn, 1849 ***Subfamily

Turbonillinae Turbonillinae is a subfamily of mostly minute parasitic sea snails, marine gastropod molluscs in the family Pyramidellidae, the pyrams and their allies.MolluscaBase (2018). Turbonillinae Bronn, 1849. Accessed through: World Register of Mari ...

Bronn, 1849 ***Subfamily Eulimellinae Saurin, 1958 ***Subfamily Cingulininae Saurin, 1959

2005 taxonomy

Pyramidelloidea has been classified within the informal group

Lower Heterobranchia Lower Heterobranchia, also known as the Allogastropoda, is a group of rather specialized, highly evolved sea slugs and sea snails, ( marine gastropod mollusks) within the subclass Heterobranchia. WoRMS (2020). "Lower Heterobranchia". Accessed at ...

in the taxonomy of Bouchet & Rocroi (2005). Taxonomy of Bouchet & Rocroi, 2005: *Superfamily Pyramidelloidea **Family

**Family

** † Family Heteroneritidae **Family

Murchisonellidae Murchisonellidae is a taxonomic family of sea snails, marine opisthobranch gastropod mollusks in the superfamily Murchisonelloidea.Bouchet, P. (2015). Murchisonellidae Casey, 1904. Accessed through: World Register of Marine Species at http://ww ...

2010 taxonomy

Jörger et al. (2010) have redefined major groups within the Heterobranchia and they moved Pyramidelloidea to

.Jörger K. M., Stöger I., Kano Y., Fukuda H., Knebelsberger T. & Schrödl M. (2010). "On the origin of Acochlidia and other enigmatic euthyneuran gastropods, with implications for the systematics of Heterobranchia". ''

BMC Evolutionary Biology ''BMC Ecology and Evolution'' (since January 2021), previously ''BMC Evolutionary Biology'' (2001–2020), is a peer-reviewed open access scientific journal covering all fields of evolutionary biology, including phylogenetics and palaeontology ...

'' 10: 323. .

Pyramidelloidean genera of uncertain familial position

* '' Bidentata'' de Castellanos, 1982 * '' Calyptopolyptychia'' Gougerot, 1968 * '' Laeviselica'' Gougerot & Le Renard, 1977 * '' Lysacme'' Dall & Bartsch, 1904 * '' Microthyca'' A. Adams, 1863 * '' Oopyramis'' Thiele, 1930 * '' Sulcorinella'' Dall & Bartsch, 1904

References

{{Taxonbar, from=Q141156 Panpulmonata Ectoparasites Marine gastropods Taxa named by John Edward Gray