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This species mainly existed during the late Devonian period. Museums will usually have their giant skulls on display.
Dunkleosteus
Its flattened, rounded shape makes it look like a throwable object that it shares its name with.
Discus
This crab got its name from a city in Washington, and is best known for its sweet and luscious taste.
Dungeness Crab
Also known as mandarinfish, this species possesses vibrant colors and elongated dorsal fins. They also don't have scales.
Dragonet
This type of shark is heavily valued in the shark fin trade, as recreational fishing has contributed to its sharp population decline within the late 1900s.
Dusky Shark
They get their name from their cephalic fins, which normally appear like horns due to this species of ray tightly curling them up.
Devil Ray
This species went extinct in the early Devonian period, and is characterized by its flattened and heavily armored body.
Drepanaspis
This type of spiny shark holds the record for the longest gestation period of any other vertebrate, with 22-24 months.
Dogfish Shark
This fish species is found in western Thailand, and was believed to be extinct in the wild until its recent rediscovery in the Sangkhla Buri province.
Dwarf Loach
They are intelligent creatures with a playful and curious nature. They are also the mascot of a particular Floridian NFL team.
Dolphin
Most species of this fish have a variety of vibrant colors. They have small, eel-like bodies, and live in saltwater.
Dartfish
These small, vibrant colored fish mostly live in coral reefs, and are extremely territorial.
Dottyback
This marine mammal looks like a manatee, but the difference is that it has a fluked tail.
Dugong
These small, aggressive fishes are known for being blue, but the males will develop yellow coloring on their snout once they reach maturity.
Damselfish
This is a very old British term used to describe a certain monotreme with a mouth resembling that of a duck.