''Pseudunela'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of minute

sea slug Sea slug is a common name for some marine invertebrates with varying levels of resemblance to terrestrial slugs. Most creatures known as sea slugs are gastropods, i.e. they are sea snails (marine gastropod mollusks) that over evolutionary t ...

acochlidian Acochlidiacea, common name acochlidians, are a taxonomic clade of very unusual sea snails and sea and freshwater slugs, aquatic gastropod mollusks within the large clade Heterobranchia. Acochlidia is a variant spelling. Description These ar ...

s, shell-less

marine Marine is an adjective meaning of or pertaining to the sea or ocean. Marine or marines may refer to: Ocean * Maritime (disambiguation) * Marine art * Marine biology * Marine debris * Marine habitats * Marine life * Marine pollution Military * ...

or temporary brackish or

brackish Brackish water, sometimes termed brack water, is water occurring in a natural environment that has more salinity than freshwater, but not as much as seawater. It may result from mixing seawater (salt water) and fresh water together, as in estuari ...

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 in the clade Acochlidiacea. ''Pseudunela'' is the only genus in the family Pseudunelidae. ''Pseudunela'' is the type genus of the family Pseudunelidae.

Taxonomy

Pseudunelidae was placed within the superfamily Strubellioidea in the taxonomy of Bouchet & Rocroi (2005). Pseudunelidae was subsequently placed within the (unranked) Hedylopsacea by Schrödl & Neusser (2010).Schrödl M. & Neusser T. P. (2010). "Towards a phylogeny and evolution of Acochlidia (Mollusca: Gastropoda: Opisthobranchia)". ''

Zoological Journal of the Linnean Society The ''Zoological Journal of the Linnean Society'' is a monthly peer-reviewed scientific journal covering zoology published by Oxford University Press on behalf of the Linnean Society. The editor-in-chief is Maarten Christenhusz (Linnean Society). ...

'' 158: 124-154. .

Species

These are the different species in the genus ''Pseudunela'': * ''

Pseudunela cornuta ''Pseudunela cornuta'' is a species of minute sea slug, an acochlidian, a shell-less marine and temporarily brackishNeusser T. P., Jörger K. M. & Schrödl M. (2011). "Cryptic Species in Tropic Sands – Interactive 3D Anatomy, Molecular Ph ...

'' (Challis, 1970) - type species of the genus ''Pseudunela'', marine and temporary brackish * ''

Pseudunela eirene ''Pseudunela'' is a genus of minute sea slugs, acochlidians, shell-less marine or temporary brackish or brackish gastropod mollusks in the clade Acochlidiacea. ''Pseudunela'' is the only genus in the family Pseudunelidae. ''Pseudunela'' is the t ...

'' Wawra, 1988 - The description of ''Pseudunela eirene'' is brief and based on a single specimen with ganglia of the nervous system and stylets of copulatory organs studied on a whole-mount by light microscopy only. No histological sections were made, and the radula was studied light-microscopically after dissolving the soft parts and stylets. Information on other organ systems is absent, and no further specimens are available for study. Marine species. * ''

Pseudunela espiritusanta ''Pseudunela espiritusanta'' is a species of sea slug, an acochlidian, a shell-less marine gastropod mollusk in the family Pseudunelidae. Its specific name is a reference to Espiritu Santo Island in Vanuatu, where it was found. This species, f ...

'' Neusser & Schrödl, 2009Neusser T. P. & Schrödl M. (2009) "Between

Vanuatu Vanuatu ( or ; ), officially the Republic of Vanuatu (french: link=no, République de Vanuatu; bi, Ripablik blong Vanuatu), is an island country located in the South Pacific Ocean. The archipelago, which is of volcanic origin, is east of no ...

tides: 3D anatomical reconstruction of a new brackish water acochlidian gastropod from

Espiritu Santo Espiritu Santo (, ; ) is the largest island in the nation of Vanuatu, with an area of and a population of around 40,000 according to the 2009 census. Geography The island belongs to the archipelago of the New Hebrides in the Pacific region o ...

. '' Zoosystema'' 31(3): 453-469
PDF
This species from

Island in

lives in

water * ''

Pseudunela marteli ''Pseudunela marteli'' is a species of sea slug, an acochlidian, a shell-less marine gastropod mollusk in the family Pseudunelidae. The specific name ''marteli'' is in honour of author's "big-hearted friend and colleague" biologist Martin “Mar ...

'' Neusser, Jörger & Schrödl, 2011 - marine * ''

Pseudunela viatoris ''Pseudunela viatoris'' is a species of sea slug, an acochlidian, a shell-less marine gastropod mollusk in the family Pseudunelidae. The specific name ''viatoris'' is after the Latin word “viator” (engl. pilgrim/voyager) according to its sup ...

'' Neusser, Jörger & Schrödl, 2011 - marineNeusser T. P., Jörger K. M. & Schrödl M. (2011). "Cryptic Species in Tropic Sands - Interactive 3D Anatomy, Molecular Phylogeny and Evolution of Meiofaunal Pseudunelidae (Gastropoda, Acochlidia)". '' PLoS ONE'' 6(8): e23313. .

Cladogram

A cladogram based on sequences of mitochondrial

18S ribosomal RNA 18S ribosomal RNA (abbreviated 18S rRNA) is a part of the ribosomal RNA. The S in 18S represents Svedberg units. 18S rRNA is an SSU rRNA, a component of the eukaryotic ribosomal small subunit (40S). 18S rRNA is the structural RNA for the small c ...

16S ribosomal RNA 16 S ribosomal RNA (or 16 S rRNA) is the RNA component of the 30S subunit of a prokaryotic ribosome (SSU rRNA). It binds to the Shine-Dalgarno sequence and provides most of the SSU structure. The genes coding for it are referred to as 16S rRNA ...

and cytochrome-c oxidase I (COI) genes showing phylogenic relations of the genus ''Pseudunela'':

References

This article incorporates CC-BY-2.0 text from reference.Neusser T. P., Martin Heß M. & Schrödl M. (11 September 2009) "Tiny but complex - interactive 3D visualization of the interstitial acochlidian gastropod ''Pseudunela cornuta'' (Challis, 1970)". '' Frontiers in Zoology'' 2009, 6: 20.

External links

* {{Taxonbar, from=Q7255734 Pseudunelidae