Toyotama-hime (豊玉姫) (Japanese for "Lady Bountiful Soul"), better known as Otohime (乙姫), is a goddess in Japanese mythology and is featured in the Kojiki as well as Nihon Shoki. She is the beautiful daughter of Ryūjin, the god of the sea.
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Myth
Toyotama first met the hunter-turned-fisherman Hoori (a descendant of the sun goddess Amaterasu) when he was trying to find his brother's lost fishing hook beneath the waves. It is here he encountered Toyotama who sought her father's permission to assist him on his task. Shortly afterwards, the two both fell in love and soon enough the two got married and spent years together under the ocean. Eventually Hoori began to yearn for the surface world so Toyotama, who was pregnant with their child, agreed to settle in her husband's native environment for the time being. Late in Toyotama's pregnancy, Hoori built a hut for their family to live in by the sea and it was here that Toyotama requested her husband not watch while she gave birth to their child. Hoori waited patiently while his wife was in labour until Toyotama gave birth to a son named Ugayafukiaezu. Unfortunately, Hoori's curiosity got the better of him and he attempted to spy on his wife. To his surprise however, rather than seeing his wife as he knew her, he witnessed an enormous wani cradling his child (one of Nihongi's version claim she was a dragon, Tatsu). This creature was none other than his beloved Toyotama who had shape-shifted to give birth. After catching her husband spying on her, she was utterly ashamed that he broke his promise. Unable to forgive Hoori, she abandoned both him and their child by returning to the sea. Following her departure, she sent her younger sister, Tamayori to help raise the child in her absence. As Ugayafukiaezu grew of age, he married his aunt and eventually conceived a child, Jimmu who became the first Emperor of Japan.
Science
The extinct crocodile genus Toyotamaphimeia was named after this deity, in direct reference to this myth.