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Situated opposite to or away from the mouth.

After the nerve turns to run on the aboral side there is no change in arrangement until the region of the tube feet is reached.

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The part of the stomach that connects to the duodenum (first part of the small intestine).

The pyloric end of the stomach exhibits strong peptonizing powers and much of the hydrolysis of protein takes place here

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Any gland having ducts that pour secretions into the digestive tract, as the salivary glands, liver, and pancreas.

Note the large stomach-cavity, surrounded by the digestive gland.

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A pouch or sack-like part of the sea star's water vascular system that expands and contracts to move water up and down each tube foot.

The ampullae were tore and egg clutches were released into a single fertilization dish and then the thawed sperm were added

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A sievelike plate in certain echinoderms, through which water passes into the vascular system.

But the water doesn't flow freely in and out, it flows in and out through a valve, which is the madreporite

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A larval stage in the development of certain marine invertebrates.

Both bipinnaria and brachiolaria larvae are bilaterally symmetrical.

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Structures on the skin of some aquatic animals that help in respiration.

In both these species the skin gills distinctly touch and grow on to the stem.

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The part of the stomach that connects to the mouth.

The cardia is the first part of the stomach, which is connected to the esophagus

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The side of an organism where the mouth is located.

The left side of the larval body becomes the oral surface of the juvenile and the right side the aboral surface

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Channels that radiate outwards from a central point.

The radial canals are represented by wide gastric pouches, and may be absent, so that the tentacles arise directly from the stomach

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Nerves that extend outwards from a central point.

Other connecting branches with the medial brachial cutaneous and radial nerve have also been described

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A system in certain marine animals that helps in movement, feeding, and respiration.

The cavity of the diverticula after the separation of the water-vascular system, forms the body-cavity.

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Small calcareous structures found in the
endoskeleton of echinoderms.

In the ossicles, the atomic pattern and the diamondlike lattice align in a way that compensates for calcite's intrinsic weakness

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Small, flexible, hollow appendages used for locomotion and feeding in echinoderms.

The Starfish's tube-feet try to pull the shells apart.

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Light-sensitive structures that can detect changes in light intensity.

Birds are known to attack eyespots or head-shaped patterns on butterfly wings.