*Lutra nippon

The Japanese sea lion (Japanese: ニホンアシカ, Hepburn: Nihon ashika, Zalophus japonicus) was an aquatic mammal thought to have become extinct in the 1970s. It was considered to be a subspecies of California sea lion (Z. californianus) until 2003. They inhabited the Sea of Japan, especially around the coastal areas of the Japanese Archipelago and the Korean Peninsula. They generally bred on sandy beaches which were open and flat, but sometimes in rocky areas.

The Japanese river otter (Lutra lutra whiteleyi) (日本川獺, Nihon-kawauso) is an extinct variety of otter formerly widespread in Japan. Dating back to the 1880s, it was even seen in Tokyo. The population suddenly shrank in the 1930s, and the mammal nearly vanished. Since then, it has only been spotted several times, in 1964 in the Seto Inland Sea, and in the Uwa Sea in 1972 and 1973. The last official sighting was in the southern part of Kōchi Prefecture in 1979, when it was photographed in the mouth of the Shinjo River in Susaki. It was subsequently classified as a "Critically Endangered" species on the Japanese Red List. On August 28, 2012, the Japanese river otter was officially declared extinct by the Ministry of the Environment. It is the official animal symbol of Ehime Prefecture. In February 2017, a wild otter was caught on camera on Tsushima Island, Nagasaki Prefecture. However, it is not known whether the observed otter was a Japanese river otter.

Japanese submarine I-152 (伊号第百五十二潜水艦, I-go dai-hyaku-go-jyuni sensuikan) was the second prototype of the Kaidai-class submarine of the Imperial Japanese Navy, many of which served in World War II.

(Jentink, 1892)
The Japanese sea lion (Japanese: ニホンアシカ, Hepburn: Nihon ashika, Zalophus japonicus) was an aquatic mammal thought to have become extinct in the 1970s. It was considered to be a subspecies of California sea lion (Z. californianus) until 2003. They inhabited the Sea of Japan, especially around the coastal areas of the Japanese Archipelago and the Korean Peninsula. They generally bred on sandy beaches which were open and flat, but sometimes in rocky areas. They were hunted commercially in the 1900s, leading to their extinction, but there are efforts to reintroduce sea lions to the Sea of Japan.

The Japanese pygmy woodpecker or pygmy woodpecker (Yungipicus kizuki) is a species of woodpecker. It is found in coniferous and deciduous forests in Russia, China, North Korea, South Korea and Japan. This species has also been placed in the genus Dendrocopos or Picoides. The International Union for Conservation of Nature (IUCN) has assessed it as a least-concern species.

I-202 was one of only three I-201-class submarine s of the Imperial Japanese Navy to be completed during World War II. The I-201 class were of advanced design, and had been built for high underwater speed. They were the fastest operational submarines built during World War II, surpassing even the German Type XXI submarines.

japonicus

The Japanese sturgeon, or Amur sturgeon (Acipenser schrenckii) is a species of fish in the Acipenseridae family that can be found in the Amur River basin in China and Russia. Claims of its presence in the Sea of Japan need confirmation. The species has 11–16 dorsal, 34–47 lateral, and 7–16 ventral scutes. Their dorsal fins have 38–53 rays and 20–35 anal fin rays. They also have greyish-brown backs and pale ventral sides. The species could reach up to 3 m in length, and weight over 190 kg.The species is considered to be critically endangered.

andersoni

* Z. lobatus

Ka. Yano & Murofushi, 1985

(Suzuki, 1996)

Günther, 1870

The Japanese sturgeon, or Amur sturgeon (Acipenser schrenckii) is a species of fish in the Acipenseridae family that can be found in the Amur River basin in China and Russia. Claims of its presence in the Sea of Japan need confirmation. The species has 11–16 dorsal, 34–47 lateral, and 7–16 ventral scutes. Their dorsal fins have 38–53 rays and 20–35 anal fin rays. They also have greyish-brown backs and pale ventral sides.

IUCN3.1