Hygrophila is a
taxonomic superorder of air-breathing
freshwater snails,
aquatic pulmonate gastropod 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 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 ...
.
[MolluscaBase eds. (2020). MolluscaBase. Hygrophila. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=382243 on 2020-12-14]
The families in this clade are basically air-breathing freshwater snails including freshwater
limpets. The three families with the greatest number of species are the Lymnaeidae (pond snails), the Planorbidae (ramshorn snails) and the Physidae (pouch or bubble snails). These are found in ponds, creeks, ditches, and shallow lakes nearly worldwide.
The snails in this clade have their eyes located at the base of their tentacles, rather than at the tips, as in the true land snails
Stylommatophora. They have shells that are thin, translucent, and relatively colorless, and they lack an
operculum.
Taxonomy
1997 taxonomy
In the older
taxonomy of the Gastropoda (Ponder & Lindberg, 1997)
The taxonomy of the Gastropoda, as revised by Winston Ponder and David R. Lindberg in 1997, is an older taxonomy of the class Gastropoda, the class of molluscs consisting of all snails and slugs. The full name of the work in which this taxonom ...
these families were placed in the suborder Basommatophora.
2005 taxonomy
Hygrophila has been a clade in the informal group
Basommatophora within the
Pulmonata.
Clade Hygrophila:
*Superfamily
Chilinoidea Dall, 1870
**Family
Chilinidae Dall, 1870
**Family
Latiidae
''Latia'' is a genus of very small, air-breathing freshwater snails or limpets, aquatic pulmonate gastropod molluscs in the superfamily Chilinoidea.
''Latia'' is the only genus in the family Latiidae.
Species in this genus are the only ...
Hutton, 1882
*Superfamily
Acroloxoidea Thiele, 1931
**Family
Acroloxidae Thiele, 1931
*Superfamily
Lymnaeoidea
Lymnaeoidea, common name the pond snails, is a taxonomic superfamily of small to large air-breathing freshwater snails, aquatic pulmonate gastropod mollusks, that belong to the superorder Hygrophila.MolluscaBase eds. (2020). MolluscaBase ...
Rafinesque, 1815
**Family
Lymnaeidae
Lymnaeidae, common name the pond snails, is a taxonomic family of small to large air-breathing freshwater snails, aquatic pulmonate gastropod mollusks, that belong to the clade Hygrophila.
Lymnaeidae is the only family within the superf ...
Rafinesque, 1815
*Superfamily
Planorboidea
Planorboidea is a superfamily of air-breathing freshwater snails, aquatic pulmonate gastropod mollusks.
All of the gastropods in this superfamily are sinistral in shell coiling.
The monophyly of Planorboidea was confirmed by Albrecht et al ...
Rafinesque, 1815
**Family
Planorbidae
Planorbidae, common name the ramshorn snails or ram's horn snails, is a family of air-breathing freshwater snails, aquatic pulmonate gastropod molluscs. Unlike most molluscs, the blood of ram's horn snails contains iron-based hemoglobin instea ...
Rafinesque, 1815
**Family
Physidae
Physidae, common name the bladder snails, is a monophyletic taxonomic family of small air-breathing freshwater snails, aquatic pulmonate gastropod molluscs in the superfamily Lymnaeoidea .MolluscaBase eds. (2021). MolluscaBase. Physida ...
Fitzinger, 1833
Note: what was previously the family
Ancylidae
Ancylini is a tribe of small, freshwater, air-breathing limpets, aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails and their allies. This tribe used to be treated as a family; the current taxonomic placemen ...
has been demoted in the new taxonomy to the status of tribe Ancylini Rafinesque, 1815 within the subfamily Planorbinae Rafinesque, 1815 of the family
Planorbidae
Planorbidae, common name the ramshorn snails or ram's horn snails, is a family of air-breathing freshwater snails, aquatic pulmonate gastropod molluscs. Unlike most molluscs, the blood of ram's horn snails contains iron-based hemoglobin instea ...
Rafinesque, 1815.
2010 taxonomy
Basommatophora (
Siphonarioidea
Siphonarioidea is a taxonomic superfamily of air-breathing sea snails or false limpets, marine gastropod mollusks in the clade Panpulmonata.
Distribution
The Siphonarioidea are broadly distributed across the globe, however they are known t ...
and
Amphiboloidea and Hygrophila) have been found
polyphyletic
A polyphyletic group is an assemblage of organisms or other evolving elements that is of mixed evolutionary origin. The term is often applied to groups that share similar features known as homoplasies, which are explained as a result of conver ...
and so Jörger et al. (2010)
[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. . have moved Hygrophila to
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 ...
.
2020 taxonomy
A comprehensive molecular phylogenetic analysis of Hygrophila based on 3112 sites of the large subunit and 5.8S
ribosomal RNA
Ribosomal ribonucleic acid (rRNA) is a type of non-coding RNA which is the primary component of ribosomes, essential to all cells. rRNA is a ribozyme which carries out protein synthesis in ribosomes. Ribosomal RNA is transcribed from ribosom ...
genes resulted in a proposal of a new taxonomic revision of the group.
*
Chilinoidea Dall, 1870
*
Lymnaeoidea
Lymnaeoidea, common name the pond snails, is a taxonomic superfamily of small to large air-breathing freshwater snails, aquatic pulmonate gastropod mollusks, that belong to the superorder Hygrophila.MolluscaBase eds. (2020). MolluscaBase ...
Rafinesque, 1815
;Synonyms:
* Acroloxoidea
Thiele, 1931: synonym of Lymnaeoidea
Rafinesque, 1815
* Planorboidea
Rafinesque, 1815: synonym of Lymnaeoidea
Rafinesque, 1815
References
{{Taxonbar, from=Q872645
Panpulmonata