protocercal tail
protocercal tail Possibly the most primitive type of tail found in fish. The posterior end of the vertebral column is straight, dividing the tail fin into two equal lobes supported by fin rays.
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Actinopterygians , Holostei Group of marine and fresh water bony fish including many fossil species, e.g. Lepidotes (Triassic—Cretaceous), and Dapedius (Jurassic). Holo… Heterocercal Tail , Skip to main content
heterocercal tail
heterocercal tail In fish, a tail in which the tip of the vertebral column turns upward, extending into the do… Fin , fin / fin/ • n. a flattened appendage on various parts of the body of many aquatic vertebrates and some invertebrates, including fish and cetaceans,… Ray , ray1 / rā/ • n. 1. each of the lines in which light (and heat) may seem to stream from the sun or any luminous body, or pass through a small opening:… Cartilaginous Fishes , The class Chondrichthyes consists of the cartilaginous fishes, including sharks, batoids (rays, skates, guitarfish, and sawfishes), and chimaeras, or… Gamma Rays , gamma rays
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protocercal tail