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Redescription of Robsonella fontaniana (Cephalopoda: Octopodidae)

Published online by Cambridge University Press:  14 May 2008

C.M. Ibáñez ,
R.D. Sepúlveda ,
J. Guerrero  and
J. Chong
C.M. Ibáñez*
Affiliation:
Instituto de Ecología y Biodiversidad, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Casilla 653, Ñuñoa, Santiago, Chile
R.D. Sepúlveda
Affiliation:
Instituto de Ecología y Evolución, Facultad de Ciencias, Universidad Austral de Chile, Casilla 567, Valdivia, Chile
J. Guerrero
Affiliation:
Zoologisches Institut und Museum der Universität Hamburg, Martin-Luther-King-Platz 3, D-20146 Hamburg, Germany
J. Chong
Affiliation:
Departamento de Ecología Costera, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Casilla 297, Concepción, Chile
*
Correspondence should be addressed to: C.M. IbáñezInstituto de Ecología y BiodiversidadDepartamento de Ciencias Ecológicas Facultad de Ciencias Universidad de Chile Las Palmeras 3425 Casilla 653 Ñuñoa SantiagoChile email: christianibez@yahoo.com
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Abstract

The genus Robsonella Adam, 1938 belongs to the family Octopodidae and can only be identified by some characters present in males. In this work the species Robsonella fontaniana is redescribed from morphological and morphometric characters of 33 specimens (21 males and 12 females) collected on the central-south coast of Chile, during the years 2003 and 2004, and of 11 specimens (three males and eight females) obtained from the Zoological Museum of Hamburg. New diagnoses for the genus Robsonella and the species R. fontaniana are provided. Sexual dimorphism in R. fontaniana is evident by adult males having enlarged suckers and a shorter third right arm compared to the females. Some morphological characters such as ligula, radula and terminal organ diverticulum make it possible to distinguish this genus clearly from other genera. The ligula of the hectocotylized arm in Robsonella is characterized by a longitudinal groove, rounded tip, large calamus and seven copulatory lamellae. In addition, the first lateral tooth in the radula is crescent-shaped; this allows the identification of Robsonella regardless of sex.

Keywords

CephalopodaOctopodidaeRobsonellaChile
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Issue 3 , May 2008 , pp. 617 - 624
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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