Gymnobela carinaria is an extinct species of sea snail, a marine gastropod mollusc, in the family Raphitomidae. Fossils of the species date to early Miocene strata of the west coast of the Auckland Region.
In the original description, Powell described the species as follows:
The holotype of the species measures in length and has a diameter of . It differs from Marshallaria spiralis due to having less bulge, and more sharply angular whorls.
The species was first described by A. W. B. Powell in 1935 as Marshallena carinaria. It was identified as tentatively a member of the genus Gymnobela by Phillip Alan Maxwell in a posthumous 2009 publication, based on the presence of decussate sculpture on the protoconch of other type specimens collected from the type location. Since 2009, Gymnobela carinaria has become the currently accepted name for the species.
The holotype was collected at an unknown date prior to 1935 from between Powell Bay and Bartrum Bay, south of Muriwai, Auckland Region (then more commonly known as Motutara), and is held in the collections of Auckland War Memorial Museum.
This extinct marine species occurs in early Miocene strata of the Nihotupu Formation of New Zealand, on the west coast of the WaitÃÂkere Ranges of the Auckland Region, New Zealand.