Members of the Sepiolida are short (mostly 2-8 cm ML), broad cephalopods with a rounded posterior mantle.
A sepioid ...
- with a short, rounded body.
- without a cuttlebone.
- Eye pore outside of ventral eyelid.
- Dorsal margin fused to or free from head.
- Ventral mantle adductor present.
- Fins broad (length ca. less than two times, usually equal to, individual fin width).
- Attachment of posterior fin-lobes broadly separated.
- Shell a thin or rudimentary gladius or absent.
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