Dicephalous v. diprosopus sharks: record of a two-headed embryo of Galeus atlanticus and review of the literature.

  title={Dicephalous v. diprosopus sharks: record of a two-headed embryo of Galeus atlanticus and review of the literature.},
  author={Valent{\'i}n Sans‐Coma and Cristina Rodr{\'i}guez and M A L{\'o}pez-Unzu and Miguel Lorenzale and Borja Fern{\'a}ndez and Luiza Vida and Ana Carmen Dur{\'a}n},
  journal={Journal of fish biology},
  volume={90 1},
As far as is known, this paper gives the first description of a two-headed shark embryo belonging to an oviparous species, Galeus atlanticus (Carcharhiniformes: Scyliorhinidae). The specimen was detected among 797 embryos intended for cardiovascular studies, which represents a defect incidence of 0·13%. Each head had a mouth, two eyes, a brain, a notochord and five gill openings on each side. The two heads fused behind the gills. On the single body, there were four anticipated dorsal fins, two… 
The first record of diprosopus tetrophthalmus in the South Atlantic Ocean: The case of Prionace glauca (Elasmobranchii: Carcharhiniformes: Carcharhinidae) in Brazil
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, from a female caught off the Brazilian coast in July 2007.
Abnormalities in two shark species, the blue shark, Prionace glauca, and the school shark, Galeorhinus galeus (Elasmobranchii: Carcharhiniformes), from the Canary Islands, eastern tropical Atlantic
A total of six abnormal embryos of shark species, five blue shark, Prionace glauca, and one school shark, Galeorhinus galeus, are reported from the Canary Islands.
Multiple morphological abnormalities in a blue shark Prionace glauca (Linnaeus, 1758) embryo from the Peruvian coast, southeast Pacific
The duplicate face parts in a single head seen in the embryo, suggest a diprosopia anomaly in a blue shark Prionace glauca.
Living naked: first case of lacking of skin related structures in an Elasmobranch, the blackmouth catshark Galeus melastomus.
The first case of lacking of skin related structures in a free-swimming Elasmobranch, the blackmouth catshark Galeus melastomus, is reported.
Living naked: first case of lack of skin-related structures in an elasmobranch, the blackmouth catshark (Galeus melastomus).
The first case of lacking of skin-related structures in a free-swimming elasmobranch, the blackmouth catshark, Galeus melastomus, is reported.
Congenital deformities are relatively common in rays and sharks. The present study aimed to describe a case of bicephaly in an R. lalandii embryo. Through radiographic images and evaluation of the
Embryonic malformations in an offspring of the shortnose guitarfish
A case of congenital malformation dominance in an offspring of the shortnose guitarfish is reported and other abnormalities commonly reported in batoids are compared in addition to discussing the possible causes involved in the observed deformities.
Ocorrência de duas bocas em Astyanax bimaculatus (Characiformes, Characidae), do açude Pereira de Miranda, Estado do Ceará, Brasil / Two-mouthed Astyanax bimaculatus (Characiformes: Characidae), from Pereira de Miranda reservoir, Pentecoste, State of Ceará, Brazil
The anomaly observed in a specimen of Astyanax bimaculatus with two mouths, captured in January, 2012 in Pereira de Miranda reservoir, Pentecoste, State of Ceara, Brazil is related to the 9th case recorded worldwide and the 2nd in Brazil, with this malformation in teleost fishes.


A series of normal stages for development of Scyliorhinus canicula, the lesser spotted dogfish (Chondrichthyes: Scyliorhinidae)
By observing numerous living eggs from the lesser spotted dogfish Scyliorhinus canicula (L.) caught near Roscoff (France) and reared at recorded temperatures as they developed from first cleavage to
First record of dicephalia in a bull shark Carcharhinus leucas (Chondrichthyes: Carcharhinidae) foetus from the Gulf of Mexico, U.S.A.
External examination, Radiography and magnetic resonance imaging revealed a case of monosomic dicephalia where the axial skeleton and internal organs were found to divide into parallel systems anterior to the pectoral girdle resulting in two well-developed heads.
Partial facial duplication (diprosopus) in a goat kid.
The anatomical and clinical features of a live-born diprosopic goat kid are described, which showed a single trunk and vertebral column, normal limbs, two sets of jaws, three orbits, and contrast radiography revealed a single patent oesophagus.
First record of a bicephalic embryo of smalltail shark Carcharhinus porosus.
The first bicephalic embryo of smalltail shark Carcharhinus porosus was removed from a pregnant female in coastal waters of the tropical eastern Pacific Ocean and suggested that although the individual's body was well formed, the malformation of the head would have affected it survival.
First record of a dicephalic specimen of tope Galeorhinus galeus (Elasmobranchii: Triakidae).
The first case of dicephalia in tope Galeorhinus galeus analysed in developing foetuses removed from a pregnant female caught off the Mar del Plata coastal waters, Argentine Sea, is reported here.
Duplication of the Pituitary and Stomatodaeal Structures in a 38-Week Male Infant
  • W. Morton
  • Medicine
    Archives of disease in childhood
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Reports of a double Rathke's pouch with two corresponding diencephalic diverticula in a 10-mm.
Embryonic development of the bulbus arteriosus of the primitive heart of jawed vertebrates
The embryological findings in a elasmobranch species are consistent with the notion that a second heart field has existed since the beginning of the jawed vertebrate radiation and that the bulbus arteriosus of chondrichthyans is a secondheart field-derived structure.
Diprosopia revisited in light of the recognized role of neural crest cells in facial development.
OBJECTIVE The aim of this study is to compare the theory of embryogenesis of the face with human diprosopia. This peculiar form of conjoined twinning is of great interest because 1) only the facial
Embryonic bicephaly in the blue shark, Prionace glauca, from the Mexican Pacific Ocean
A case of bicephaly in embryos of the blue shark Prionace glauca in the Mexican Pacific Ocean is described, and it is thought that the abnormality probably began during the embryonic development.
Partial craniofacial duplication: a review of the literature and case report.
A 15 month-old female with a duplicated oral cavity, mandible, and maxilla with diprosopus is described, a severe deformity often associated with anencephaly, and patients with partial duplication typically benefit from surgical treatment.