Can anybody help me to identify this animal collected from estuary, south west cost of India?

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P. R. Jayachandran

Dear Dr. Luis what about below picture?

picture is from ventral and dorsal side

María V. Delahoz

leeches (Hirudinea) ??

Jérôme Jourde

a nudibranch gastropod ? if so you should find a radula inside

Sekar Veeramuthu

First one is Leeches and second one is damage nemertean, last one is dorididae (Opisthobranch) juvenile