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

Víctor Pastén Marambio, Valentina Hevia Hormazábal, Enzo Acuña, Alonso Vega


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.

Palabras clave

Chondrichthyes; orbital malformations; conjoined twins; bycatch; embryogenesis

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DOI: https://doi.org/10.22370/rbmo.2018.53.0.1251