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Hydatina zonata (Lightfoot, 1786) [Bulla]

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Hydatina zonata looks like having a brown shell with white lines, but it is characterised by thin brown lines running across the translucent white shell, essentially parallel to the outer lip of the shell. There are spiral bands around the base and apex of the shell where the brown lines are absent, and sometimes another spiral band somewhere between the base and the apex. These colourless bands are sometimes bordered with a thin brown line. The colour of the animal varies from a pale translucent almost white form to a dark pinkish brown edged with white.
Thanks for identification of this specimen to Dr. Juan Lucas Cervera Currado
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 zonata are at Bill Rudman's Sea Slug Forum!
How to cite:
Köhler, E. (2016), published 26 July 2016, Hydatina zonata (Lightfoot, 1786)
available from http://www.Philippine-Sea-Slugs.com/Heterobranchia/Hydatina_zonata.htm