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Tantulum elegans
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
(unranked):	clade Heterobranchia clade Euthyneura clade Panpulmonata clade Acochlidiacea clade Hedylopsacea^[1]
Family:	Tantulidae Rankin, 1979
Genus:	Tantulum Rankin, 1979
Species:	T. elegans
Binomial name
*Tantulum elegans* Rankin, 1979^[2]

Tantulum elegans is a species of freshwater slug, an aquatic shell-less gastropod mollusk within the clade Acochlidiacea.

This species has no shell.^[2] The maximum recorded length is 2 mm.^[3]

Tantulum elegans is the only species in the genus Tantulum, and that is in turn the only genus in the family Tantulidae.^[4]

Taxonomy

In 2005, Tantulidae was classified as the only family within the superfamily Hedylopsoidea in the taxonomy of Bouchet & Rocroi.^[5]

According to Schrödl & Neusser (2010)^[1] Tantulidae is in the clade Hedylopsacea.^[1]

This species occurs in the Caribbean island of Saint Vincent. It was collected at an altitude of 411.5 m.^[3]

Tantulum elegans are sequential hermaphrodites.^[6]

^ ^a ^b ^c Schrödl M. & Neusser T. P. (2010). "Towards a phylogeny and evolution of Acochlidia (Mollusca: Gastropoda: Opisthobranchia)". Zoological Journal of the Linnean Society 158: 124-154. doi:10.1111/j.1096-3642.2009.00544.x.
^ ^a ^b Rankin J. J. (1979). "A freshwater shell-less mollusc from the Caribbean: structure, biotics, and contribution to a new understanding of the Acochlidioidea". Life Sciences Contributions, Royal Ontario Museum 116: 123 pp.
^ ^a ^b Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. doi:10.1371/journal.pone.0008776.
^ Strong E. E., Gargominy O., Ponder W. F. & Bouchet P. (2008). "Global Diversity of Gastropods (Gastropoda; Mollusca) in Freshwater". Hydrobiologia 595: 149-166. hdl:10088/7390 doi:10.1007/s10750-007-9012-6.
^ Bouchet, Philippe; Rocroi, Jean-Pierre; Frýda, Jiri; Hausdorf, Bernard; Ponder, Winston; Valdés, Ángel & Warén, Anders (2005). "Classification and nomenclator of gastropod families". Malacologia. 47 (1–2). Hackenheim, Germany: ConchBooks: 1–397. ISBN 3-925919-72-4. ISSN 0076-2997.
^ Neusser T. P. & Schrödl M. (2007). "Tantulum elegans reloaded: a computer-based 3D-visualization of the anatomy of a Caribbean freshwater acochlidian gastropod". Invertebrate Biology 126(1): 18-39. doi:10.1111/j.1744-7410.2007.00073.x.

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