Nerite Shells at Port Douglas

Mostly Nerite Shells (Nerita costata Duclos) in a part-submerged rock crevice at Port Douglas

Nerite Shells are very common inhabitants of rocky shores on the Queensland coast in Australia; and they generally have a wide Indo-Pacific distribution. There are several species but the specimens shown here are Nerita costata Gmelin and were photographed at Port Douglas.

They have a characteristic appearance with thick black rounded ridges spiralling around the shell whorls, with lighter coloured furrows between them. The spire is blunt. The aperture opening is roughly semicircular with a specific arrangement of protruberances or ‘teeth’. The odd-shell-out in pictures 1 and 2 is a Mulberry Shell or Granulated Drupe (Morula granulata¬†Duclos) which has an odd look with spirals of dark rounded bumps vaguely resembling a bunch of grapes or similar.

Mostly Nerite Shells (Nerita costata Duclos) in a part-submerged rock crevice

Dry Nerite Shells in a rock crevice at low tide

Individual Nerite Shell in thin film of water.

Outer surface of Nerita costata

Under surface of Nerita costata showing aperture and operculum

COPYRIGHT JESSICA WINDER 2013

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