Speciation, phenotypic plasticity, or ontogeny, the case of the genusGalkinius(Pyrgomatidae, Cirripedia, Crustacea).

Simon-Blecher, Noa, Hosie, Andrew M., Guy-Haim, Tamar , Chan, Benny K. K. and Achituv, Yair (2015) Speciation, phenotypic plasticity, or ontogeny, the case of the genusGalkinius(Pyrgomatidae, Cirripedia, Crustacea). Zoological Journal of the Linnean Society, 176 (2). pp. 305-322. DOI 10.1111/zoj.12314.

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Abstract

Barnacles of the genus Galkinius occupy a large spectrum of host corals, making it one of the least host-specific genera within the Pyrgomatidae. Molecular analyses show that within the genus Galkinius there are highly supported clades, suggesting that the genus Galkinius is a complex of evolutionarily significant units (ESUs). The morphology of the opercular valves has been used as the basis for the separation of species of Galkinius. In this study, morphological variability was found both between specimens within ESUs extracted from different host species and between specimens extracted from the same colony. Identifications based on the opercular valves cannot therefore be assigned to different species despite being genetically distinguishable. It is proposed that in many cases the differences between valve morphology of different species of Galkinius are the outcome of ontogeny. Allometric growth of the valves has resulted in differences in the proportions of the parts of the valve.

Document Type: Article
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1111/zoj.12314
ISSN: 0024-4082
Date Deposited: 12 Jun 2017 08:56
Last Modified: 05 Feb 2018 12:42
URI: http://oceanrep.geomar.de/id/eprint/38302

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