# data[].attributes.headline
 Anatomy and Physiology of Aquatic Species

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 Anatomy and Physiology of Aquatic Species

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- Is a hard , external coverng which provides protection and support for an organism
- Is made of chitin, a subsance which forms hard, semitrasparent material
-Does not allow for continuous growth of the animal, therefore it grows in periods and the exoskeleton undergoes molting
**Molting- A crustacean undergoes ecdysis, or shedding of the exoskelotn, to allow for growth of the animal

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Is characterized by the following:
*Exoskeleton
*Antenna
*Jointed legs
*Segmented bodies
*Bilateral symmetry

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- Are crustaceans at the larval stage
- Are characterized by the following:
*Unsegmented body
* Median eye
*Three pairs of appendages

Median Eye- Also known as a parietal eye, this is photosensitive "third eye" located in the center of the skull

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Include the following
-Crustaceans
-Mollusks
-Fish

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-Are chiefly aquatic organism which have a hard shell or crust covering their body
- Belongs to the phylum arthropoda class crustacea
-Includes lobsters, crabs, shrimp and barnacles

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-Are the paired appendages located at the front most segment of arthropods
- On crustaceas are uiramous n the first pair and biramous in the rest
-Function as sensory organs which allow for taste, smell and touch
**Biramous - A limb which branches into two. Eac h branch consist of segments attached end to end
**Uniramous- A limb comprised of a single series of segments attached end to end