Eyebrow Sap-sucker

Costasiella is a genus of sacoglossan sea slugs, a shell-less marine opisthobranchid gastropod mollusk in the family Costasiellidae. The Costasiella is defined by some specific characteristics such as smooth rhinophores which are usually simple with dull tips and flattened at their base. Other features include rounded, tentacular anterior foot corners that exhibit their spatulate shape to enhance mobility and blade-shaped radular teeth with substantially short bases.

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