Embryonic bicephaly in the blue shark, Prionace glauca, from the Mexican Pacific Ocean

Galván‐Magaña, Felipe; Escobar-Sánchez, Ofelia; Carrera‐Fernández, Maribel

doi:10.1017/s1755267210001120

Cited by 39 publications

(34 citation statements)

References 10 publications

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“…The most frequently reported embryonic abnormality in sharks is bicephally (e.g. Dean, 1923;Mancini et al, 2006;Galva´n-Magan˜a et al, 2011), which among developmental anomalies is perhaps the most conspicuous and thus more likely to be detected than more subtle deformities.…”

Section: Resultsmentioning

confidence: 99%

Abnormal blacktip shark,Carcharhinus limbatus, embryo from the northern Gulf of Mexico

Driggers

Hannan

Hoffmayer

et al. 2012

Journal of Applied Ichthyology

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Section: Resultsmentioning

confidence: 99%

Abnormal blacktip shark,Carcharhinus limbatus, embryo from the northern Gulf of Mexico

Driggers

Hannan

Hoffmayer

et al. 2012

Journal of Applied Ichthyology

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“…The occurence of anomalies is more frequently recorded in osteichthyan species than in chondrichthyan (MNASRI et al, 2010), and despite several reports of morphological alterations in Chondrichthyes (i.e. SAÏDI et al, 2006;RIBEIRO-PRADO et al, 2008;NUNES;PIORSKI, 2009;MNASRI et al, 2010;GALVÁN MAGAÑA et al, 2011;HEVIA-HORMAZÁBAL et al, 2011), no records of anomalies in the species Zapteryx brevirostris (MÜLLER; HENLE, 1841) (Rhinobatidae) exist.…”

Section: Notes / Notasmentioning

confidence: 99%

Teratogenic processes in an embryo without gills and low yolk absorption of Zapteryx brevirostris (Elasmobranchii: Rhinobatidae)

Carmo

Fávaro

2015

Braz. j. oceanogr.

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This is the first report of morphological anomaly in embryos of Zapteryx brevirostris (Lesser guitarfish), a very common species in Brazil. The gills were absent, and the pectoral fins were not fully formed nor were they completely fused to the head. They were asymmetrical, with the larger left pectoral fin projecting more toward the head (almost at the height of the eyes). The pelvic fin was absent, making sexing impossible. The cause of the morphological deformity is uncertain, although a nutritional problem of the embryo is evoked. Este é o primeiro relato de anomalias morfológicas em embriões de Zapteryx brevirostris, espécie comum no Brasil. As brânquias estiveram ausentes, e as nadadeiras peitorais mostraram-se assimétri-cas e não totalmente formadas e fundidas à cabeça. A nadadeira esquerda, a maior, se projetou destacadamente em direção à cabeça, quase alcançando a altura dos olhos. A nadadeira pélvica esteve ausente, não foi possível a determinação do sexo do animal. A causa da deformidade morfológica é incerta, mas sugere-se que possa estar relacionada a problema nutricional durante o desenvolvimento do embrião. AbstrAct

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“…Malformations may also affect the anterior disc in stingrays (Templeman, ; Rosa, Gomes, & Gadig, ; Escobar‐Sánchez et al, ), giving them a bat‐like aspect, or even deformities involving the paired fins (Ellis, ; Moore, ; Taniushi & Ynagisawa, ). Other skeletal deformities encompass the forward position of the eyes (Driggers et al, ), snout abnormalities (Hoenig & Walsh, ; Saidi, Bradai, Guelorget, & Capape, ), missing gill slits (Coelho & Erzini, ), cyclopia (Ferreira, Ferreira, & Amorim, ), bicephaly (Delpiani, Deli‐Antoni, Barbini, & Figueroa, ; Ferreira et al, ; Guida et al, ; Galván‐Magaña et al, ; Mancini et al, ; Wagner, Rice, & Pease, ), In the present paper, we report a deformity related to the pelvic fin and clasper in a freshwater stingray of the genus Potamotrygon , subfamily Potamotrygoninae (Carvalho, Loboda, & Silva, ). Despite its rarity, deformities involving the clasper were previously reported for Potamotrygon falkneri (Garrone Neto, ) and related to inadequate management of these stingrays by local fisherman or caused by predation (Serrasalmidae).…”

Section: Introductionmentioning

confidence: 99%

Morphological deformities in the pelvic fin and clasper in specimens ofPotamotrygon marquesi(Chondrichthyes: Myliobatiformes: Potamotrygoninae)

Silva

Casas

2020

J Appl Ichthyol

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We report deformities in the pelvic fin and clasper skeleton in specimens of Potamotrygon marquesi from Acre, Northwestern Brazil. The malformations involve skeletal deformities in the pelvic girdle, right clasper skeleton, and severe muscular and skeletal deformities in the left or right pelvic fin and clasper, including the loss of all of its terminal components. Descriptions of malformations dealing with elasmobranchs are extensive in the literature and are important for future studies dealing with their probable causes. Nevertheless, although the reasons of these deformities are herein possibly linked to malformation (as a result of stress or chemical contaminants) or predation, the anomalies in the muscular and skeletal components of the pelvic fin and clasper are described in detail and compared to a non‐deformed specimen.

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Embryonic bicephaly in the blue shark, Prionace glauca, from the Mexican Pacific Ocean

Cited by 39 publications

References 10 publications

Abnormal blacktip shark,Carcharhinus limbatus, embryo from the northern Gulf of Mexico

Abnormal blacktip shark,Carcharhinus limbatus, embryo from the northern Gulf of Mexico

Teratogenic processes in an embryo without gills and low yolk absorption of Zapteryx brevirostris (Elasmobranchii: Rhinobatidae)

Morphological deformities in the pelvic fin and clasper in specimens ofPotamotrygon marquesi(Chondrichthyes: Myliobatiformes: Potamotrygoninae)

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