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

• Published in: Acta Ichthyologica et Piscatoria
• Main Authors: F. Lamarca, N. Ribeiro, F. Galheigo, M. Vianna
• Format: Article in Journal/Newspaper
• Language: English
• Published: Pensoft Publishers 2017
• Subjects: anomaly; blue shark; embryo; malformation; South A; Aquaculture. Fisheries. Angling; SH1-691; South Atlantic Ocean
• Online Access: https://doi.org/10.3750/AIEP/02226; https://doaj.org/article/0421be016e3b4594bc41eff77069dbf3

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 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 deformities in the skull, head muscles and curvature of the vertebral column.