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Hydatina physis (Linnaeus, 1758) [Bulla]

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Hydatina physis is quite variable in its colour shading. It can range from a very dark form to a pale pinkish white in which the bluish border is almost invisible. It has thin brown lines running across the translucent white shell. Hydatina physis feeds exclusively on cirratulinid polychaete worms.
This species is in older publications placed in the Order Cephalaspidea, according to Bouchet & Rocroi (2005) are
the superfamilies: Acteonoidea and Ringiculoidea no more in the Order Cephalaspidea in the Subclass: OPISTHOBRANCHIA, but
in the new informal group Lower Heterobranchia (= Allogastropoda) Haszprunar, 1985.
Reference:
Bouchet P., Rocroi J.-P., Frýda J., Hausdorf B., Ponder W., Valdés Á. & Warén A. (2005). "Classification and nomenclator of gastropod families".
Malacologia: International Journal of Malacology (Hackenheim, Germany: ConchBooks) 47 (1-2): 1-397.
ISBN 3925919724. ISSN 0076-2997.
More informations on Hydatina physis are at Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2017), published 5 April 2017, Hydatina physis (Linnaeus, 1758)
available from https://www.Philippine-Sea-Slugs.com/Heterobranchia/Hydatina_physis.htm