The tentacles are permanently lost during the paralarval or early juvenile stages in some squids. After the tentacles have been lost (resorbed?) no trace remains. The picture below is of a squid that lacks tentacles. Note the position between arms III and IV where tentacles normally occur: no trace of tentacles remains. Many squids lose their tentacles during capture and a stump will remain. Many squids lose their tentacles at sexual maturity and a stump is usually present although sometimes only a scar is left.
Tentacle Absence in CephalopodsRichard E. Young, Michael Vecchione, and Katharina M. Mangold (1922-2003)
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