Tylodina perversa
Tylodina perversa - frontal view
Tylodina perversa
Tylodina perversa - foot
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Tylodina perversa (Gmelin, 1791)
UMBRACULIDA
11mm Xlendi Reef, Gozo 24m depth 6/9/92
Ventral view
11mm Bahar ic-Caghaq <1m depth 12/2/93
Frontal view
Small sized found in shallow water on the yellow sponge Aplysina aerophoba. The body colour is an intense yellow without any markings. Rhinophores are present as a two short solid tentacles without ornamentation. Foot tentacles are present as two very short tentacles. Shell is medium sized covering most of the animal, patelliform with a raised and curved central tip, pale honey colour semitransparent but with a few black radiating lines across the surface.
Size: 11mm. Uncommon.

Specific characteristics: The patelliform shell and the intense yellow colouration are sufficient criteria to identify this species in the Mediterranean.

Identification by Dr. A. Perrone
Links:
Marine species
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Tylodinidae