External Anatomy Of A Starfish

Starfish are deuterostome animals like the chordates. Dorsal view of a dissected starfish showing gonads and ampullae.

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Anatomy is the study of the internal and external structures present in an organism.

External anatomy of a starfish. Water vascular system 9. Dissection showing where cardiac stomach opens into the mouth. Many sea stars have five arms but some species may have up to 40.

Start studying starfish anatomy externalinternal. In this book full color photos create a visual dictionary of the key external anatomy of a starfish a species of sea star an echinoderm including its central disk arms mouth tubed feet and tentacles. Others eg blood stars have spines so small that their skin appears smooth.

Starfish are echinoderms and belong to the class asteroidea. In this article we will discuss about asterias starfish 1. Habit and habitat of asterias 3.

Asteris arm microscopic xs. Respiratory and excretory system 12. Ventral view of starfish showing external anatomy.

This species is also known as sea star. Close up of madreporite and stone canal. A 2014 analysis of 219 genes from all classes of echinoderms gives the following phylogenetic tree.

These arms are often covered with spines for protection. The times at which the clades diverged is shown under the labels in millions of years ago mya. Dorsal view of a dissected starfish showing pyloric cecum and pyloric ducts.

Some sea stars like the crown of thorns starfish have large spines. History of asterias 2. These are found in the pacific atlantic indian and even the arctic and southern oceans.

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