Crustacean showcase

Click on a fossil Waptia fieldensis Canadaspis perfecta Penaeus speciosus Udora brevispina Dromiopsis rugosus Crabs Recent crustaceans The crustaceans body consists of a head (cephalon), and mid body (thorax or abdomen) and a tail (pygidium), but in many forms the head has been fused to the massive chest building a cephalothorax or a prosoma. The shape of the legs is highly variable. On the ventral side of the head, the two anteriormost pairs of legs are developed as antennae. The following three pairs of legs are used for picking up and finely distributing the food. The legs of the thorax and hind body are developed as two-branched legs, with one walking branch and one gill branch. The crustaceans are known from the early Cambrian (540 million years ago) to the present day. They live in marine (salt) and fresh water and on land. More than 25 000 species exist today. 
List of contents in the crustacean showcase

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Publisert 18. mai 2011 16:00