External Anatomy Of A Starfish

Some sea stars like the crown of thorns starfish have large spines. Many sea stars have five arms but some species may have up to 40.

Sea Star Anatomy 101

In this article we will discuss about asterias starfish 1.

External anatomy of a starfish. Water vascular system 9. Dorsal view of a dissected starfish showing pyloric cecum and pyloric ducts. Starfish are deuterostome animals like the chordates.

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. Starfish are echinoderms and belong to the class asteroidea.

Respiratory and excretory system 12. A 2014 analysis of 219 genes from all classes of echinoderms gives the following phylogenetic tree. Anatomy is the study of the internal and external structures present in an organism.

Ventral view of starfish showing external anatomy. These are found in the pacific atlantic indian and even the arctic and southern oceans. Dorsal view of a dissected starfish showing gonads and ampullae.

Habit and habitat of asterias 3. Close up of madreporite and stone canal. Dissection showing where cardiac stomach opens into the mouth.

Others eg blood stars have spines so small that their skin appears smooth. This species is also known as sea star. Asteris arm microscopic xs.

Learn vocabulary terms and more with flashcards games and other study tools. History of asterias 2. 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.

Starfish Dissection Pdf Bainzbio11