Answer: telson

AnswerCrossword Clue
TELSONScorpion's stinger
TELSONTerminal segment of a crustacean.
TELSONSegment of a lobster's tail.
TELSONMiddle flipper of a lobster's tail
telsonthe terminal segment of an arthropod
telsonthe last segment, or an appendage of the last segment, of certain arthropods, as the middle flipper of a lobster's tail