Table of Contents
On which surface is the eyespots of a starfish visible?
Feel the upper surface of the starfish for spines. These spines protect the starfish and are part of their internal skeleton. Label these on figure 1. Look at the tip of each arm and find the eyespot.
What is the spot on top of a starfish?
Instead of blood, sea stars have a circulatory system made up primarily of seawater. Seawater is pumped into the animal’s water vascular system through its sieve plate. This is a sort of trap door called a madreporite, often visible as a light-colored spot on the top of the starfish.
What is the Aboral surface of a starfish?
The aboral surface of the sea star, which is the side farthest from the sea stars mouth, is the first image below. The oral surface of the sea star is next, which is the sea star’s underside that’s closest to its mouth. The anatomy visible from both of these surfaces has been identified and defined.
On which surface are these parts of a starfish visible dorsal oral?
The mouth is located underneath the sea star on the oral or ventral surface, while the anus is located on the top of the animal. The spiny upper surface covering the species is called the aboral or dorsal surface.
What are 2 classes of echinoderms?
The echinoderms can be divided into two major groups:
- Eleutherozoa are the echinoderms that can move. This group includes the starfish and most other echinoderms.
- Pelmatozoa are the immobile echinoderms. This group includes crinoids, such as the feather stars.
What Colour is starfish blood?
purply-red colour
The bloody henry starfish is normally a bright purply-red colour and is found all around the UK.
What is another name for the ventral surface of a starfish?
Echinoderms
| Question | Answer |
|---|---|
| Type of symmetry seen in starfish larvae | bilateral |
| In a starfish, the ______ stomach is connected to the digestive glands and stays in the body during feeding. | pyloric |
| another name for the ventral surface in a sea star | oral |
Where are the eyes of a starfish located?
A starfish has eye spots that cannot see much in the way of details but can detect light and dark. These eye spots are at the tip of each of the starfish’s arms.
Which is the white spot on a sea star’s body?
Bivium: The two rays closest to the sea star’s madreporite. 5. Madreporite or sieve plate: This is the reddish-orange, or sometimes white spot towards the center, top of the sea star’s body that lets water into it’s water vascular system.
Where is the mouth of a sea star?
But starfish remains a popular name for the sea star to this day. The aboral surface of the sea star, which is the side farthest from the sea stars mouth, is the first image below. The oral surface of the sea star is next, which is the sea star’s underside that’s closest to its mouth.
What do you call the bottom of a starfish?
The terminology in starfish anatomy is usually based in reference to the mouth, to avoid an incorrect assumption of homology between the dorsal and ventral surfaces. Thus, the bottom surface is referred to as the oral or the actinal surface, whereas the top surface is referred to as the aboral or abactinal side.