Inspection of the Zuiyo Maru pictures reveals that the aquatic cryptid had a symmetrical pair of small upper fins on each side above the anterior flippers. If this observation is correct, then the identification of this animal as a basking shark is false. Previously, the fin of just one side was observed and wrongly identified as a shark’s dorsal fin that had slid sideways from the mid-dorsal ridge. Examination of the original scientific report reveals that Yano, along with all the fishermen, observed a pair of upper fins. They specifically stated there was not a shark’s dorsal fin. That statement caused considerable discussion among the scientists who questioned them. Besides that, some archaeological representations of marine tetrapods display the small symmetrical upper fin(s). Their appearance is like Yano’s pictures, tending to provide confirmation for this feature. Another confirmation for the marine reptile understanding, and falsification of the shark idea, is a picture revealing the nare at the lower front of the skull. It is right where Yano sketched it, though that is not where it should be for sharks. Although this cryptid may not currently be identified with either living creatures or specific known fossils, it possessed characteristics like those of marine reptiles, perhaps similar to the Sauropterygia.