Answer: salp

AnswerCrossword Clue
SALPTunicate.
SALPOceanic tunicate
SALPMarine tunicate
SALPSmall marine animal
salpa free-swimming small marine animal, also SALPA, SALPIAN, SALPID
salpany free-swimming, oceanic tunicate of the genus Salpa, having a transparent, more or less fusiform body