Sand dollar là con gì

     
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Phylum Echinodermata > Class Echinodea > Order Clypeasteroida
Cake svà dollar Arachnoides placenta Family Clypeasteridae updated Mar 20đôi mươi Where seen? This rather featureless disk-shaped animal is commonly seen on some of our Northern shores, on svà bars & sandy areas near seagrasses. Often found in groups of large numbers of individuals, half buried in the s&. Sometimes also seen on the Southern shores.

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Quý Khách đang xem: Sand dollar là con gì Features: Body diameter 6-8centimet. Seen in various sizes, some may be tiny (about the kích thước of a 10cent coin). It has no slots in the toàn thân. While the star-shaped petalloid is not very obvious in living specimens, they are clearly seen in the chạy thử of a dead sand dollar. The colours of a living s& dollar may range from deep reddish-purple, to brownish-purple or beige.

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Mouth on the underside.
Dead or alive? S& dollars may appear dead, but they are very much alive. A living s& dollar is covered with fine spines and appears velvety. The skeleton (test) of a dead one is smooth, without any spines, & the details of skeleton can be seen more clearly. The skeleton is fragile và will shatter at the slighdemo pressure.

Living sand dollars, not moving under s&.Lazarus Islvà, Jun 09
What eats s& dollars? Some snails such as the Grey bonnet are believed to lớn feed on s& dollars. A Knobbly sea star was seen with its stomach stuông chồng to a s& dollar. A Haddon"s carpet anemone was also seen in the process of engulfing one. Kok Sheng also shared a Clip clip (below) of hermit crabs arguing over a sand dollar. Tiny parasitic snails are sometimes seen on them too.
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