Ptychogastria polaris

Allman, 1878

Umbrella 18 to 22 mm wide; hemispherical to conical; exumbrella with 16 radiating ridges; 16 gonads on sides of 8 manubrial lobes; 48 tentacle clusters each formed by 3 filiform tentacles and numerous adhesive ones; 16 statocysts.

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