Another term for protrusible.
- Wrasses characteristically have a protractile mouth, cycloid scales, and a single continuous dorsal fin lacking an obvious notch between the soft and spiny portions.
- In blennies the palatines are toothless, and the mouth not protractile.
- Ponyfish have a very protractile mouth, a phenomenon which can be demonstrated by squeezing the head, when the mouth will shoot forward.
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