The times at which the clades diverged is shown under the labels in millions of years ago mya. Sea stars are composed of a central disc from which arms sprout in radial symmetry.
Starfish Dissection Biology Junction
Using your diagram sheets and the pictures below to locate the following structures and note their functions.
External anatomy of starfish. Place the starfish on your dissection tray with its aboral surface facing upward. Others eg blood stars have spines so small that their skin appears smooth. Respiratory and excretory system 12.
Most starfish have five arms however some have more or less. In fact some starfish can have different numbers of arms even within one species. Habit and habitat of asterias 3.
External anatomy starfish express pentamerism that is pentaradial symmetry. Arms or rays. Dorsal view of a dissected starfish showing gonads and ampullae.
Most species have five arms or rays radiating from a central disk although several species have six or more arms. Others eg blood stars have spines so small that their skin appears smooth. Some sea stars like the crown of thorns starfish have large spines.
They have radial symmetry and an oral surface as well as aboral with the arms and disk covered with spikes. Dissection showing where cardiac stomach opens into the mouth. Water vascular system 9.
A 2014 analysis of 219 genes from all classes of echinoderms gives the following phylogenetic tree. Asteris arm microscopic xs. Start studying starfish anatomy externalinternal.
Starfish are deuterostome animals like the chordates. Close up of madreporite and stone canal. Learn vocabulary terms and more with flashcards games and other study tools.
Sea stars are invertebrates and organisms with no head but tube feet and arms where they can sense as well as see. History of asterias 2. Dorsal view of a dissected starfish showing pyloric cecum and pyloric ducts.
These five arms or more can regenerate them as long as the central disk is not affected. Ventral view of starfish showing external anatomy. These are the five extensions that you see projecting from the middle of the starfish.
In this article we will discuss about asterias starfish 1.
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