Dyakiidae Explained

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).

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

Distribution

The family Dyakiidae is endemic to Sundaland in Southeast Asia.^[1]

Anatomy

In this family, the number of haploid chromosomes is between 26 and 30 (according to the values in this table).^[2]

The family also includes the only known terrestrial gastropods to emit light.^{[3] [4]}

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).^[2] (These anatomical characteristics also include the family Staffordiidae which was considered part of the Dyakiidae at the time the study was done).

Genera

The family Dyakiidae includes the following genera, with a steadily increasing number of described species (71 species until 2007 + 11 new species in 2009^[5]):

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

Cladogram

The following cladogram shows the phylogenic relationships of this family and superfamily with the other families within the limacoid clade:^[10]

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

External links

• Gude, G. K. & Woodward, B. B. (1921). On Helicella, Férussac. Proceedings of the Malacological Society of London. 14 (5/6): 174-190. Londo

Notes and References

1. Hausdorf . B. . A Preliminary Phylogenetic and Biogeographic Analysis of the Dyakiidae (Gastropoda: Stylommatophora) and a Biogeographic Analysis of Other Sundaland Taxa . 10.1111/j.1096-0031.1995.tb00095.x . Cladistics . 11 . 4 . 359–376 . 1995 . free . 34920646 . .
2. 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. .
3. Isobe . M. . Uyakul . D. . Goto . T. . Counsilman . J. J. . Dyakia bioluminescence—1. Bioluminescence and fluorescence spectra of the land snail, D. Striata . 10.1002/bio.1170020204 . Journal of Bioluminescence and Chemiluminescence . 2 . 2 . 73–79 . 1988 . 3213594 . .
4. Pholyotha . Arthit . Yano . Daichi . Mizuno . Gaku . Sutcharit . Chirasak . Tongkerd . Piyoros . Oba . Yuichi . Panha . Somsak . 2023-09-13 . A new discovery of the bioluminescent terrestrial snail genus Phuphania (Gastropoda: Dyakiidae) . Scientific Reports . en . 13 . 1 . 15137 . 10.1038/s41598-023-42364-y . 2045-2322 . 10499882 . 37704646. 2023NatSR..1315137P .
5. Liew . T. S. . Schilthuizen . M. . Vermeulen . J. J. N. . 10.1111/j.1096-3642.2009.00526.x . 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 . 2009 . free . .
6. [Henry Haversham Godwin-Austen|Godwin-Austen H. H.]
7. [Henry Haversham Godwin-Austen|Godwin-Austen H. H.]
8. 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) : 363-369. PDF
9. Parin Jirapatrasilp. Piyoros Tongkerd. Ekgachai Jeratthitikul. Thor-Seng Liew. Arthit Pholyotha. Chirasak Sutcharit. Somsak Panha. 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. 2021. 250–280. 10.1093/zoolinnean/zlaa129.
10. Hausdorf . B. . Biogeography of the Limacoidea sensu lato (Gastropoda: Stylommatophora): Vicariance events and long-distance dispersal . 10.1046/j.1365-2699.2000.00403.x . Journal of Biogeography . 27 . 2 . 379–390 . 2000 . 2656267. 2000JBiog..27..379H . .