derived from electric acne and skates (but the latter's ass is too flat).
Arising from Mormirides and Hymnotides, on the contrary, is very painful.

You confuse the marine virgins of Western mythology with our mermaids, who have nothing to do with fish. In Slavic mythology, these are river, forest and other spirits in the face of naked girls. In fact, naked virgins are their only common trait, and further, depending on the nationality and region, they could be former drowned women, and relatives of all kinds of midday women, and even part of the row of the wives of different gods. And Fig knows which of them the poet meant sitting on the branches.