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Achatinellidae
	A live individual of A. bulimoides
	An unidentified species of Auriculella
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Superfamily:	Pupilloidea; Gulick, 1873
Family:	Achatinellidae; Gulick, 1873

Achatinellidae is a family of tropical air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Pupilloidea.

Taxonomy

It was previously the only family in the superfamily Achatinelloidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). It is now classified under the superfamily Pupilloidea.

The family Achatinellidae represents a diverse adaptive radiation. All species of tree-snail in Hawaii are believed to have come from a single ancestral snail. How that ancestral snail made the 3,800 kilometres (2,400 mi) trip across the ocean is unknown. A longstanding theory is that a bird carried a notably smaller ancestor across the ocean and dropped it on the islands, as bird mediated dispersal has been documented in other snail species. Alternative theories include that it floating across the ocean on a mat of debris, or that it island hopped across the Pacific in a combination of the theories.^[2]

Subfamilies in the family Achatinellidae include:

Achatinellinae Gulick, 1873 - synonym: Helicterinae Pease, 1870 (inv.)
Auriculellinae Odhner, 1921
Elasmatininae Iredale, 1937
- tribe Elasmatinini Iredale, 1937 - synonyms: Strobilidae Zilch, 1959 (n.a.); Pitysinae Cooke & Kondo, 1961
- tribe Antonellini Cooke & Kondo, 1961
- tribe Tubuaiini Cooke & Kondo, 1961
Pacificellinae Steenberg, 1925
- tribe Pacificellini Steenberg, 1925 - synonym: Tornatellinoptini Cooke & Kondo, 1961
- tribe Lamellideini Cooke & Kondo, 1961
Tekoulininae Solem, 1972
Tornatellidinae Cooke & Kondo, 1961
- tribe Tornatellidini Cooke & Kondo, 1961
- tribe Tornatellariini Cooke & Kondo, 1961
Tornatellininae Sykes, 1900
- tribe Tornatellinini Sykes, 1900
- tribe Elasmiatini Kuroda & Habe, 1949

Anatomy

In this family, the number of haploid chromosomes lies between 16 and 25 (according to the values in the table).^[3]

Distribution

This family of snails occurs widely in the Pacific islands. They are at their most diverse in the Hawaiian group.^[4]^[5]

Genera

Genera in the family Achatinellidae include:

Achatinellinae

Achatinella Swainson, 1828^[6] - type genus of the subfamily Achatinellinae
Partulina Pfeiffer, 1854^[6]
Perdicella Pease, 1870^[6]
Newcombia Pfeiffer, 1854^[6]

Auriculellinae

Auriculella Pfeiffer, 1854 - type genus of the subfamily Auriculellinae^[6]

Elasmatininae

tribe Elasmatinini
tribe Antonellini
tribe Tubuaiini
- Tubuaia

Pacificellinae

tribe Pacificellini
- Tornatellinops Pilsbry & Cooke, 1915
tribe Lamellideini
- Lamellidea Pilsbry, 1910

Tekoulininae

- Tekoulina Solem, 1972

Tornatellidinae

tribe Tornatellidini
- Tornatellides Pilsbry, 1910 - type genus of the tribe Tornatellidini
tribe Tornatellariini
- Tornatellaria Pilsbry, 1910 - type genus of the tribe Tornatellariini

Tornatellininae

tribe Tornatellinini
- Tornatellina L. Pfeiffer, 1842 - type genus the tribe Tornatellinini
tribe Elasmiatini
- Elasmias Pilsbry, 1910 - type genus of the tribe Elasmiatini

unsorted

Gulickia Cooke, 1915^[7]
† Hotumatua Kirch, Christensen & Steadman, 2009 - Hotumatua anakenana Kirch, Christensen & Steadman, 2009^[8]
Tornatellinops Pilsbry, 1915
Tornelasmias Iredale, 1944

References

^ Gulick J. T. (1873). "On the classification of the Achatinellidae". Proceedings of the Zoological Society of London 1873(1): 89-91.
^ Holland, Brenden S; Hadfield, Michael G (August 2004). "Origin and diversification of the endemic Hawaiian tree snails (Achatinellidae: Achatinellinae) based on molecular evidence". Molecular Phylogenetics and Evolution. 32 (2): 588–600. doi:10.1016/j.ympev.2004.01.003. PMID 15223040.
^ Barker G. M. Gastropods on Land: Phylogeny, Diversity and Adaptive Morphology. In Barker G. M. (ed.): The biology of terrestrial molluscs. CABI Publishing, Oxon, UK, 2001, ISBN 0-85199-318-4. 1-146, cited pages: 139 and 142.
^ Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1
^ Cooke, C. M. and Yoshio Kondo. 1960. Revision of Tornatellinidae and Achatinellidae (Gastropoda, Pulmonata). Bernice P. Bishop Museum, Bulletin 221. 303 pp.
^ ^a ^b ^c ^d ^e Holland, Brenden S; Hadfield, Michael G (2004). "Origin and diversification of the endemic Hawaiian tree snails (Achatinellidae: Achatinellinae) based on molecular evidence". Molecular Phylogenetics and Evolution. 32 (2): 588–600. doi:10.1016/j.ympev.2004.01.003. PMID 15223040.
^ Cowie R. H. (1996). "Gulickia alexandri". 2006 IUCN Red List of Threatened Species. Downloaded on 7 August 2007.
^ Kirch P. V., Christensen C. C. & Steadman D. W. (2009). "Subfossil Land Snails from Easter Island, Including Hotumatua anakenana, New Genus and Species (Pulmonata: Achatinellidae) 1". Pacific Science 63(1): 105-122. PDF.