Abstract
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.
Highlights
The specimens with diprosopous and bicephalous features, anomalous was the only embryo with malformation of the and the case described by Mancini et al (2006) should offspring
Ehemann et al (2016) normal, recently fixed specimens of almost the same size reported an additional case of bicephalia for the species. but of other samples: AC.UERJ 1866.1, AC.UERJ 773.3, Hevia-Hormazábalet al. (2011) reported the first case AC.UERJ 1448, and AC.UERJ 773.1. These numbers of diprosopus tetrophthalmus in sharks, in a specimen correspond, respectively, to normal specimens 1, 2, 3, of P. glauca caught off Chile, according to the and 4 (Table1)
Okazaki et al (1987) defined diprosopus as TL consisting of a single neck and body and duplication of between the anomalous specimen and the four normal ones craniofacial structures; the term tetrophthalmos is applied were calculated with a calliper
Summary
Prionace glauca is a viviparous, pelagic species that morphology, the specimen was placed in a petri dish and is found in coastal waters, from shallow waters up x-rayed with the Faxitron MX-20 digital radiography to 600 m depth (Compagno 1984). The specimens with diprosopous and bicephalous features, anomalous was the only embryo with malformation of the and the case described by Mancini et al (2006) should offspring.
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