Pseudunela is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of minute sea slug

Sea slug

Sea slug is a common name used for several different groups of saltwater snails that either lack a shell or have only an internal shell, in other words this name is used for various lineages of marine gastropod mollusks that are either not conchiferous or appear not to be.The phrase "sea slug" is...

s, acochlidians, shell-less marine

Marine (ocean)

Marine is an umbrella term. As an adjective it is usually applicable to things relating to the sea or ocean, such as marine biology, marine ecology and marine geology...

 or temporary brackish or brackish gastropod mollusks in the clade Acochlidiacea

Acochlidiacea

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...

.

Pseudunela is the only genus in the family Pseudunelidae. Pseudunela is the type genus of the family Pseudunelidae.

Taxonomy

Pseudunelidae has been placed within the superfamily Strubellioidea in the taxonomy of Bouchet & Rocroi

Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005)

The taxonomy of the Gastropoda as it was revised by Philippe Bouchet and Jean-Pierre Rocroi is currently the most up-to-date overall system for classifying gastropod mollusks...

 (2005).

Pseudunelidae has been placed within the (unranked) Hedylopsacea by Schrödl & Neusser (2010).

Species

There are only three species in the genus Pseudunela:

• Pseudunela cornuta
  Pseudunela cornuta
  Pseudunela cornuta is a species of minute sea slug, an acochlidian, a shell-less marine and temporary brackish gastropod mollusk in the family Pseudunelidae....
  
  (Challis, 1970) - type species of the genus Pseudunela, marine and temporary brackish
• Pseudunela eirene 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
  Pseudunela espiritusanta is a species of sea slug, an acochlidian, a shell-less marine gastropod mollusk in the family Pseudunelidae.Its specific name is in honor of Espiritu Santo Island in Vanuatu, where it was found....
  
  Neusser & Schrödl, 2009 This species from Espiritu Santo
  Espiritu Santo
  Espiritu Santo is the largest island in the nation of Vanuatu, with an area of . It belongs to the archipelago of the New Hebrides in the Pacific region of Melanesia. It is in the Sanma Province of Vanuatu....
  
   Island in Vanuatu
  Vanuatu
  Vanuatu , officially the Republic of Vanuatu , is an island nation located in the South Pacific Ocean. The archipelago, which is of volcanic origin, is some east of northern Australia, northeast of New Caledonia, west of Fiji, and southeast of the Solomon Islands, near New Guinea.Vanuatu was...
  
   lives in brackish water
• Pseudunela marteli Neusser, Jörger & Schrödl, 2011 - marine
• Pseudunela viatoris Neusser, Jörger & Schrödl, 2011 - marine