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Reproduction in the finless sleeper ray is viviparous, with the embryos sustained through gestation by a yolk sac.
en.wikipedia.org This species is presumably aplacental viviparous like other electric rays.
en.wikipedia.org They are viviparous animals, giving birth to young that possess external gills.
en.wikipedia.org Like other hammerheads, the scoophead is viviparous, with the pups measuring 34 cm or less at birth.
en.wikipedia.org Some viviparous species receive nutrients via the placenta (present in therians, some skinks and some fish).
en.wikipedia.org