Nudibranchs - Sunshine Coast etc. / 366e-copy
All photos copyright ©2003-2017 Gary Cobb
31/12/07
Gary Cobb 0416 048 100
gary@nudibranch.com.au
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4411

Tornatina sp. 1
Location: Alexandra Headland, Sunshine Coast, Mooloolaba, Queensland Australia
Size: 2-4 mm
Depth: Intertidal (Anaerobic extraction method)
Temperature: 26 C

ORDER: CEPHALASPIDEA
FAMILY:
Cylichnidae

white

NOTE: Tornatina sp. 1 (family Cylichnidae), immature individuals. These photos, especially the second photo below, clearly show the heterostrophic protoconch (that is one in which coiling of the protoconch goes in an opposite direction to the adult shell – a feature common to all the Heterogastropoda, which includes opisthobranchs and pyramidellids) and also note the large and widely separated posterior lobes of the head shield. The thin blue margin on these lobes and also on the margin of the foot probably comes from a zone of especially long sensory hairs (cilia), not pigment. Interestingly for a bubble snail, the foot is short and lacks parapodia, and the Hancock’s organs are cuticularised.

Photographs by Gary Cobb and David Mullins - Copyright 2003-2017

4411
Acteocina sp. 1 showing the heterostrophic protoconch




First Bubble shell found at Old Woman Island 6 mm



NOTE below: the larger shell is Tornatina sp. 1