lancelets.
Small, fishlike marine chordates, pointed at both ends with no distinguishable head, in which the notochord runs the entire length of the nerve cord, are called lancelets.
What traits do lancelets possess?
- Lancelets are sleek creatures.
- A dorsal fin runs the length of the body's upper surface, continuing as a caudal fin around the tail and a ventral fin to the body's bottom surface atrium.
- Paired fins are not present, but metapleural folds on the body's sides may be paired fin progenitors.
How come it's called a lancelet?
Because of their elongated bodies, lancelets are also known as amphioxus, which translates to "both ends pointy".
Where do lancelets live?
- Lancelets are found on temperate and tropical shores all over the world.
- They live in shallow coastal waters with soft substrates that range from sand to coarse shelly sand or gravel.
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