The first record of diprosopus tetrophthalmus in the South Atlantic Ocean: The case of Prionace glauca (Elasmobranchii: Carcharhiniformes: Carcharhinidae) in Brazil

The first record of diprosopus tetrophthalmus in the South Atlantic Ocean: The case of Prionace glauca (Elasmobranchii: Carcharhiniformes: Carcharhinidae) in Brazil

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The majority of morphological abnormalities reported for elasmobranchs are cases of bicephalia.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 (Linnaeus, 1758), from a female caught off the Fleece Shirts Brazilian coast (26°36′11′′S, 45°56′00′′W) in July 2007.The specimen is described and compared to normal specimens from the same size and to another one with similar deformities from Chile.The embryo is smaller than a normal embryo, with Dipping Bowls deformities in the skull, head muscles and curvature of the vertebral column.