Rev. biol. mar. oceanogr. 53(S1): 25-30



A case of tetrophthalmia with unilateral synophthalmia in an unborn fetus of blue shark Prionace glauca (Carcharhiniformes, Carcharhinidae)

Víctor Pastén-Marambio1, Valentina Hevia-Hormazábal1, Enzo Acuña1,2* and J.M. Alonso Vega1

1Departamento de Biología Marina, Facultad de Ciencias del Mar, Universidad Católica del Norte, Casilla 117, Coquimbo, Chile
2Millenium Nucleus for Ecology and Sustainable Management of Oceanic Islands (ESMOI), Departamento de Biología Marina,Universidad Católica del Norte, Coquimbo, Chile

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This study describes and classifies a case of multiple malformations in an unborn blue shark Prionace glauca fetus, which was extracted from a gravid female captured during a research campaign addressed to the biological study of sharks in northern and central Chile. The analyzed specimen shows tetrophthalmia with unilateral synophthalmia, anomaly characterized by the existence of 4 ocular globes, two of which are partially fused. In addition, the axial skeleton of the fetus shows thoracic lordosis and helical torsion in the abdominal-caudal portion. This is the first world report of tetrophthalmia with unilateral synophthalmia in chondrichthyans.

Key words: Chondrichthyes, orbital malformations, conjoined twins, bycatch, embryogenesis