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FATE OF THE CYPRIS AND ADULT ADDUCTOR MUSCLES DURING METAMORPHOSIS OF BALANUS AMPHITRITE (CIRRIPEDIA: THORACICA)

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ABSTRACT The ontogeny of the cypris adductor muscle (CAM) and the adult adductor muscle (musculus adductor scutorum, MAS) of the acorn barnacle Balanus amphitrite was examined during the cypris/juvenile metamorphosis. By using section series of epoxy-resin embedded material, we found that the MAS of the adult barnacle develops de novo in a preoral position, while the postoral CAM degenerates but remains present. Eventually the CAM of the cypris larva disintegrates and the remaining MAS serves to close the opercular plates of the juvenile and adult barnacle. The CAM and the MAS accordingly do not represent homologous structures and should be encoded as separate characters in a phylogenetic analysis. The character states of the CAM and MAS in the taxa comprising the Thecostraca are reviewed.

10.1163/193724098X00296
/content/journals/10.1163/193724098x00296
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/content/journals/10.1163/193724098x00296
2017-08-17

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