Thanks for your cooperation, This species found in Persian Gulf from the Iranian coastal waters and in muddy beaches, If you need more information to identify it, I will explain to you.
This species belongs to order Ceriantharia and it is not a sea anemone because the name sea anemone is to indentified to order like Actiniaria and Corallimorpharia.
The taxonomic status to order Ceriantharia is following:
Superphyllum Coelenteratha
Phyllun Cnidaria
Subphyllum Anthozoaria
Class Anthozoa
Sub Class Hexacoralla (=Zoantharia)
Order Ceriantharia
So this species was found in muddy beaches,the typical habitat of Ceriantharia,and the form and types of tentacles are long and numerous so is very probably this species. belongs to this order.
While I would agree that this is a species in the order Ceriantharia, I would suspect that it is not C. lloydii. A quick search on WoRMS suggests that C. lloydii has been recorded only in NW Europe and NE Atlantic.
Definitely Ceriantharia,perhaps Cerianthidae. May be 90% Cerianthidae.
I would not be able to put any genus here, I would expect at least three genera from close areas . Do you have it sampled? I would love to have a look if there is a material available. But better more than one specimen. and it has to be complete, and the tube can be... 40 cm easily
Cerianthus lloydii can be met as far South as Cape Cod in Atlantic and down to Korea in Pacific. It is a boreal or even arctic-boreal species and cannot be found in Persian Gulf. And// it never has striped tentacles. It seems to be tide depth...