Dicephalous v. diprosopus sharks: record of a two-headed embryo of Galeus atlanticus and review of the literature.

@article{SansComa2017DicephalousVD,
  title={Dicephalous v. diprosopus sharks: record of a two-headed embryo of Galeus atlanticus and review of the literature.},
  author={Valent{\'i}n Sans‐Coma and Cristina Rodr{\'i}guez and M A L{\'o}pez-Unzu and Miguel Lorenzale and Borja Fern{\'a}ndez and Luiza Vida and Ana Carmen Dur{\'a}n},
  journal={Journal of fish biology},
  year={2017},
  volume={90 1},
  pages={
          283-293
        }
}
As far as is known, this paper gives the first description of a two-headed shark embryo belonging to an oviparous species, Galeus atlanticus (Carcharhiniformes: Scyliorhinidae). The specimen was detected among 797 embryos intended for cardiovascular studies, which represents a defect incidence of 0·13%. Each head had a mouth, two eyes, a brain, a notochord and five gill openings on each side. The two heads fused behind the gills. On the single body, there were four anticipated dorsal fins, two… 
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This contribution describes the third confirmed case worldwide and the first in the South Atlantic of diprosopus tetrophthalmus (craniofacial duplication) in a foetus of blue shark, Prionace glauca, from a female caught off the Brazilian coast in July 2007.
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TLDR
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