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Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Gastropoda
Subclassis: Heterobranchia
Infraclassis: Euthyneura
Cohors: Tectipleura
Subcohors: Panpulmonata
Superordo: Eupulmonata
Ordo: Stylommatophora
Subordo: Helicina
Infraordo: Limacoidei
Superfamilia: Trochomorphoidea

Familia: Dyakiidae
Genera (13): Asperitas – Bertia – Dyakia – Elaphroconcha – Everettia – Inozonites – Kalamantania – Phuphania – Pliotropis – Pseudoplecta – Quantula – Rhinocochlis – Sasakina

Dyakiidae Gude & Woodward, 1921

Template:Gude & Woodward, 1921

Sutcharit, C., Naggs, F., Ablett, J., Sang, P.V., Hao, L.V. & Panha, S. 2019. Notes on the sinistral helicoid snail Bertia cambojiensis (Reeve, 1860) from Vietnam (Eupulmonata, Dyakiidae). ZooKeys, 885: 1–14. DOI: 10.3897/zookeys.885.38980 Open access Reference page.


Dyakiidae in the World Register of Marine Species

Vernacular names
English: Dyakiidae

Dyakiidae is a family of air-breathing land snails terrestrial pulmonate gastropod mollusks in the superfamily Trochomorphoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).[2]

Some of the species in this family are sinistral (left-handed) in their shell coiling.

The family Dyakiidae is endemic to Sundaland in Southeast Asia.[3]

In this family, the number of haploid chromosomes is between 26 and 30 (according to the values in this table).[4]

The family also includes Quantula striata, the only known terrestrial gastropod to emit light.[5]

The Digestive system characteristics are as follows. The buccal mass is small. The jaw is smooth. The stomach is very simple with weak muscles (as is the case in the majority of land snails).[4] (These anatomical characteristics also include the family Staffordiidae which was considered part of the Dyakiidae at the time the study was done).

The family Dyakiidae includes the following genera, with a steadily increasing number of described species (71 species until 2007[6] + 11 new species in 2009[7]):

Asperitas Gray, 1857 - 14 species
Bertia Ancey, 1887 - at least 4 species
Dyakia Godwin-Austen, 1891 - type genus, 22 species
Elaphroconcha Gude, 1911 - 10 species
Everettia Godwin-Austen, 1891[8] - 25 species
Kalamantania Laidlaw, 1931 - only one species: Kalamantania whiteheadi (Godwin-Austen, 1891)[9]
Phuphania Tumpeesuwan, Naggs & Panha, 2007 - 3 species including: Phuphania globosa Tumpeesuwan, Naggs & Panha, 2007[6]
Pseudoplecta Laidlaw, 1932 - only one species: Pseudoplecta bijuga (Stoliczka, 1873)
Pseudoquantula Jirapatrasilp & Panha gen. nov. - only one species: Pseudoquantula lenticularis Jirapatrasilp & Panha sp. nov.[10]
Quantula Baker, 1941 - 7 species including: Quantula striata (Gray, 1834)
Rhinocochlis Thiele, 1931 - only one species: Rhinocochlis nasuta (Metcalfe, 1852)
Sasakina Rensch, 1930 - 5 species


The following cladogram shows the phylogenic relationships of this family and superfamily with the other families within the limacoid clade:[11]
limacoid clade























Gude G. P. L. K. & Woodward B. B. (1921). "On Helicella, Férussac". Proceedings of the Malacological Society of London 14(5-6): 174-190. page 185.
Bouchet, Philippe; Rocroi, Jean-Pierre; Frýda, Jiri; Hausdorf, Bernard; Ponder, Winston; Valdés, Ángel & Warén, Anders (2005). "Classification and nomenclator of gastropod families". Malacologia. Hackenheim, Germany: ConchBooks. 47 (1–2): 1–397. ISBN 3-925919-72-4. ISSN 0076-2997.
Hausdorf, B. (1995). "A Preliminary Phylogenetic and Biogeographic Analysis of the Dyakiidae (Gastropoda: Stylommatophora) and a Biogeographic Analysis of Other Sundaland Taxa". Cladistics. 11 (4): 359. doi:10.1111/j.1096-0031.1995.tb00095.x..
Barker G. M. (2001) Gastropods on Land: Phylogeny, Diversity and Adaptive Morphology. 1-146. In: Barker G. M. (ed.) (2001) The biology of terrestrial molluscs. CABI Publishing, Oxon, UK, cited pages: 139-144. ISBN 0-85199-318-4.
Isobe, M.; Uyakul, D.; Goto, T.; Counsilman, J. J. (1988). "Dyakia bioluminescence—1. Bioluminescence and fluorescence spectra of the land snail, D. Striata". Journal of Bioluminescence and Chemiluminescence. 2 (2): 73–79. doi:10.1002/bio.1170020204. PMID 3213594..
Tumpeesuwan C., Naggs F. & Panha S. (31 August 2007) "A new genus and new species of dyakiid snail (Pulmonata: Dyakiidae) from the Phu Phan range, northeastern Thailand". Raffles Bulletin of Zoology 55(2) Archived July 22, 2009, at the Wayback Machine: 363-369. PDF
Liew, T. S.; Schilthuizen, M.; Vermeulen, J. J. N. (2009). "Systematic revision of the genus Everettia Godwin-Austen, 1891 (Mollusca: Gastropoda: Dyakiidae) in Sabah, northern Borneo". Zoological Journal of the Linnean Society. 157 (3): 515. doi:10.1111/j.1096-3642.2009.00526.x..
Godwin-Austen H. H. (1891) "On a collection of Land-shells made In Borneo by Mr. A. Everett, with Descriptions of supposed new species. Part II. Zonitidae and Helicidae". Proceedings of the Zoological Society of London for the year 1891: 22-47, p. 33.
Godwin-Austen H. H. (1891) "On a collection of Land-shells made In Borneo by Mr. A. Everett, with Descriptions of supposed new species. Part II. Zonitidae and Helicidae". Proceedings of the Zoological Society of London for the year 1891: 22-47, p. 24.
Parin Jirapatrasilp; Piyoros Tongkerd; Ekgachai Jeratthitikul; Thor-Seng Liew; Arthit Pholyotha; Chirasak Sutcharit; Somsak Panha (2021). "Molecular phylogeny of the limacoid snail family Dyakiidae in Southeast Asia, with the description of a new genus and species". Zoological Journal of the Linnean Society. 193 (1): 250–280. doi:10.1093/zoolinnean/zlaa129.

Hausdorf, B. (2000). "Biogeography of the Limacoidea sensu lato (Gastropoda: Stylommatophora): Vicariance events and long-distance dispersal". Journal of Biogeography. 27 (2): 379. doi:10.1046/j.1365-2699.2000.00403.x. JSTOR 2656267..

Further reading

Laidlaw F. F. (1931). "On a new sub-family Dyakiinae of the Zonitidae". Proceedings of the malacological Society of London 19: 190-201. abstract.
Schileyko A. A. (2003). "Treatise on recent terrestrial pulmonate mollusks. 10. Ariophantidae, Ostracolethaidae, Ryssotidae, Milacidae, Dyakiidae, Staffordiidae, Gastrodontidae, Zonitidae, Daudebardiidae, Parmacellidae". Ruthenica, Supplement 2. 1309-1466.
Bouchet P., Rocroi J.P., Hausdorf B., Kaim A., Kano Y., Nützel A., Parkhaev P., Schrödl M. & Strong E.E. (2017). Revised classification, nomenclator and typification of gastropod and monoplacophoran families. Malacologia. 61(1-2): 1-526

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