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Adipose fin: In some fish, a second dorsal fin consisting of a flap of fatty tissue, which lacks supporting rays.
Amphipods: A group of small shrimp-like crustaceans that includes sandhoppers, beach hoppers, and water lice.
Crustacean: Diverse group of arthropods (a phylum of animals with jointed limbs and a hard chitinous exoskeleton) characterised by the possession of two pairs of antennae, one pair of mandibles (parts of the mouthparts used for handling and processing food) and two pairs of maxillae (appendages used in eating, which are located behind the mandibles). Includes crabs, lobsters, shrimps, slaters, woodlice and barnacles.
Dorsal: The dorsal fin is the unpaired fin found on the back of the body of fish.
Isopods: A diverse group of crustaceans, with flattened, segmented bodies, that includes pill bugs and woodlice.
Pectoral fins: In fish, the pair of fins that are found one on each side of the body just behind the gills. They are generally used for balancing and braking.
Subterranean: Living underground, in caves or groundwater.