Semirossia patagonica is a species of bobtail squid native to the southwestern Atlantic Ocean and southeastern Pacific Ocean; it occurs around the southern part of South America and has been recorded from waters off Chile, Anegada Bay, Tierra del Fuego, Argentina, and the Falkland Islands.

[3] The type specimen measures 21 mm in mantle length (given as "Length of body 21 millims.").

[4] The type specimen was collected off Patagonia, Argentina and is deposited at The Natural History Museum in London.

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