[OANNES Foro] Egg capsules of the dusky catshark (Byt)haelurus canescens (Carcharhiniformes, Scyliorhinidae) from the south-eastern Pacific Ocean

[Mario Cabrejos]

Journal of Fish Biology
Article first published online: 19 AUG 2010
DOI: 10.1111/j.1095-8649.2010.02736.x
http://en.wikipedia.org/wiki/Dusky_catshark

Egg capsules of the dusky catshark Bythaelurus canescens (Carcharhiniformes, Scyliorhinidae) from the south-eastern Pacific Ocean
F. Concha1,*, C. Bustamante2, M. C. Oddone3, S. Hernández4,?, J. Lamilla2

1 Laboratorio de Ecología e Impactos Ambientales, Facultad de Ciencias del Mar y de Recursos Naturales, Universidad de Valparaíso, Chile2 Laboratorio de Elasmobranquios (ELASMOLAB), Instituto de Zoología, Universidad Austral de Chile, Valdivia, Chile3 Universidade Federal de Rio Grande, Instituto de Oceanografia, Laboratório de Elasmobrânquios e Aves Marinhas, Avenida Itália, km 8 s/n, Caixa Postal 474, 96201-900 Rio Grande, RS, Brazil4 Facultad de Ciencias del Mar, Universidad Católica del Norte, Coquimbo, Chile*Correspondence: F. Concha, Tel.: +56 63 221647; fax: +56 63 221315; email: francisco.concha en gmail.com? Present address: School of Biological Sciences, Victoria University of Wellington, P. O. Box 600, Wellington 6140, New Zealand

SUMMARY
The external morphology of the egg capsule of Bythaelurus canescens and its fixation to the substratum are described. Bythaelurus canescens egg capsules are typically vase-shaped, dorso-ventrally flattened, pale yellow in colour when fresh and covered by 12-15 longitudinal ridges. The anterior border of the capsule is straight, whereas the posterior border is semicircular. Two horns bearing long, coiled tendrils arise from the anterior and posterior ends of the capsule. The presence of longitudinal ridges and long coiled tendrils at both anterior and posterior ends of the capsule readily distinguish these egg capsules from those of other chondrichthyans occurring in the south-east Pacific Ocean.
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