Trochida is an
order
Order, ORDER or Orders may refer to:
* A socio-political or established or existing order, e.g. World order, Ancien Regime, Pax Britannica
* Categorization, the process in which ideas and objects are recognized, differentiated, and understood
...
of small to very large
vetigastropods. It includes
recent
The Holocene () is the current geological epoch, beginning approximately 11,700 years ago. It follows the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene together form the Qu ...
and extinct
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.
[MolluscaBase (2018). Trochida. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=1052448 on 2019-01-06]
Taxonomy
Extant trochomorphs stem from a large, archaic
clade
In biology, a clade (), also known as a Monophyly, monophyletic group or natural group, is a group of organisms that is composed of a common ancestor and all of its descendants. Clades are the fundamental unit of cladistics, a modern approach t ...
. According to Uribe ''et al.'' (2016) the superfamilies
Angarioidea and
Phasianelloidea are deeply nested within the superfamily
Trochoidea sensu Williams (2012).
[Williams, S.T., 2012, ''Advances in molecular systematics of the vetigastropod superfamily Trochoidea.'' Zoologica Scripta, 41(6): 571–595.] The revised taxonomy (2017) of Bouchet ''et al.'' therefore only recognizes the superfamily Trochoidea (including Angarioidea and Phasianelloidea).
Superfamilies
*
Trochoidea Rafinesque, 1815
;Synonyms:
* Angarioidea
Gray, 1857: synonym of Trochoidea
Rafinesque, 1815
* Phasianelloidea
Swainson, 1840: synonym of Trochoidea
Rafinesque, 1815
References
* Bouchet P., Rocroi J.P., Hausdorf B., Kaim A., Kano Y., Nützel A., Parkhaev P., Schrödl M. & Strong E.E. (2017). Revised classification, nomenclator and typification of gastropod and monoplacophoran families. Malacologia. 61(1-2): 1-526
{{Taxonbar, from=Q58192325
Vetigastropoda