swordtailed
Swordtailed refers to a characteristic found in certain species of fish, most notably in the family Xiphophoridae, commonly known as swordtails. This defining feature is a prominent, elongated ray at the base of the caudal fin, which extends beyond the rest of the tail. In males of many swordtail species, this appendage is notably extended and often has a pointed, sword-like appearance, giving the fish its name.
The presence and development of this "sword" are often a secondary sexual characteristic, meaning it is more
Beyond the visual characteristic, the term "swordtailed" does not denote a separate taxonomic group but rather