Wednesday, May 24, 2017
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Pink and Sand Dollars

Sand dollars are a type of sea urchin specially adapted to burrowing in sand. In contrast to most other sea urchins, the bodies of sand dollars are clothed in very small spines, which are used in locomotion, and to keep sediment off the body surface. The typical sand dollar has a greatly flattened body, and is usually circular.

Southern Calamari, Nototodarus Gouldi, Squid are a large, diverse group of marine cephalopods. Like all cephalopods, squid are distinguished by having a distinct head, bilateral symmetry, a mantle, and arms. Squid, like cuttlefish, have eight arms and two tentacles arranged in pairs.

This rose pink sand dollar is rarely seen, body diameter 4-6cm. Somewhat pentagonal rather than circular. On the upperside it is thick at the edges and at the center.

Habitat: sand dollars burrow in sand. They move and burrow using tubed feet called podia.

Feeding: Sand dollars feed on particles picked up by the podia from the seabed. Particles are passed from podium to podium to special food grooves on the underside of their bodies, and through these to the mouth. Food includes not only particles that pass between the spines, but also diatoms and algal fragments collected by the tube feet, and small crustaceans.

Threats: Like most marine creatures, sand dollars may be affected by changes in sea temperature or water quality.

Pink and Sand Dollars

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