Hyala

Hyala is a genus of very small, somewhat land snails that have a gill and an operculum, semi-terrestrial gastropod mollusks or micromollusks belonging to the family Iravadiidae.

Description

(Original description) The head of the animal is elongated and emarginate at the tip, forming two distinct lobes. The tentacles are flattened, lacking a club-shaped tip, and possess fine setae at their extremities. The eyes are sessile and located centrally on the base of each tentacle. The foot is simple posteriorly. The opercular lobe lacks a caudal cirrus. The shell is hyaline (transparent).

They are subsurface deposit feeders.

Species

Species within the genus Hyala include:

• Hyala adamsi <small>Golikov & Kussakin in Golikov & Scarlato, 1971</small>
• Hyala bella <small>(A. Adams, 1853)</small>
• † Hyala fragila <small>Dockery, 1993</small>
• Hyala vitrea <small>(Montagu, 1803)</small>

• † Hyala laevigatoidea <small>Gründel, 1993</small>: synonym ofs † Usedomella laevigatoidea <small>(Gründel, 1993</small> (superseded combination)
• Hyala mediterranea <small>F. Nordsieck, 1972</small>: synonym of Hyala vitrea <small>(Montagu, 1803)</small>
• Hyala pumila <small>A. Adams, 1870</small>: synonym of Microdryas pumila (A. Adams, 1870) (superseded combination)

References

• Ponder W. F. (1984) A review of the genera of the Iravadiidae (Gastropoda: Rissoacea) with an assessment of the relationships of the family. Malacologia 25(1): 21-71. page(s): 51-52
• Vaught, K.C. (1989). A classification of the living Mollusca. American Malacologists: Melbourne, FL (USA). . XII, 195 pp.
• Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp.&nbsp;180–213