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Articulation and growth of skeletal elements in balanid barnacles (Balanidae, Balanomorpha, Cirripedia)

The morphology and ultrastructure of the shells of two balanid species have been examined, paying special attention to the three types of boundaries between plates: (i) radii-parietes, (ii) alae-sheaths, and (iii) parietes-basal plate. At the carinal surfaces of the radii and at the rostral surfaces...

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Autores principales: Checa, Antonio G., Salas, Carmen, Rodríguez-Navarro, Alejandro B., Grenier, Christian, Lagos, Nelson A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6774972/
https://www.ncbi.nlm.nih.gov/pubmed/31598290
http://dx.doi.org/10.1098/rsos.190458
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author Checa, Antonio G.
Salas, Carmen
Rodríguez-Navarro, Alejandro B.
Grenier, Christian
Lagos, Nelson A.
author_facet Checa, Antonio G.
Salas, Carmen
Rodríguez-Navarro, Alejandro B.
Grenier, Christian
Lagos, Nelson A.
author_sort Checa, Antonio G.
collection PubMed
description The morphology and ultrastructure of the shells of two balanid species have been examined, paying special attention to the three types of boundaries between plates: (i) radii-parietes, (ii) alae-sheaths, and (iii) parietes-basal plate. At the carinal surfaces of the radii and at the rostral surfaces of the alae, there are series of crenulations with dendritic edges. The crenulations of the radius margins interlock with less prominent features of the opposing paries margins, whereas the surfaces of the longitudinal abutments opposing the ala margins are particularly smooth. The primary septa of the parietes also develop dendritic edges, which abut the internal surfaces of the primary tubes of the base plates. In all cases, there are chitino-proteinaceous organic membranes between the abutting structures. Our observations indicate that the very edges of the crenulations and the primary septa are permanently in contact with the organic membranes. We conclude that, when a new growth increment is going to be produced, the edges of both the crenulations and the primary septa pull the viscoelastic organic membranes locally, with the consequent formation of viscous fingers. For the abutting edges to grow, calcium carbonate must diffuse across the organic membranes, but it is not clear how growth of the organic membranes themselves is accomplished, in the absence of any cellular tissue.
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spelling pubmed-67749722019-10-09 Articulation and growth of skeletal elements in balanid barnacles (Balanidae, Balanomorpha, Cirripedia) Checa, Antonio G. Salas, Carmen Rodríguez-Navarro, Alejandro B. Grenier, Christian Lagos, Nelson A. R Soc Open Sci Biology (Whole Organism) The morphology and ultrastructure of the shells of two balanid species have been examined, paying special attention to the three types of boundaries between plates: (i) radii-parietes, (ii) alae-sheaths, and (iii) parietes-basal plate. At the carinal surfaces of the radii and at the rostral surfaces of the alae, there are series of crenulations with dendritic edges. The crenulations of the radius margins interlock with less prominent features of the opposing paries margins, whereas the surfaces of the longitudinal abutments opposing the ala margins are particularly smooth. The primary septa of the parietes also develop dendritic edges, which abut the internal surfaces of the primary tubes of the base plates. In all cases, there are chitino-proteinaceous organic membranes between the abutting structures. Our observations indicate that the very edges of the crenulations and the primary septa are permanently in contact with the organic membranes. We conclude that, when a new growth increment is going to be produced, the edges of both the crenulations and the primary septa pull the viscoelastic organic membranes locally, with the consequent formation of viscous fingers. For the abutting edges to grow, calcium carbonate must diffuse across the organic membranes, but it is not clear how growth of the organic membranes themselves is accomplished, in the absence of any cellular tissue. The Royal Society 2019-09-04 /pmc/articles/PMC6774972/ /pubmed/31598290 http://dx.doi.org/10.1098/rsos.190458 Text en © 2019 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Biology (Whole Organism)
Checa, Antonio G.
Salas, Carmen
Rodríguez-Navarro, Alejandro B.
Grenier, Christian
Lagos, Nelson A.
Articulation and growth of skeletal elements in balanid barnacles (Balanidae, Balanomorpha, Cirripedia)
title Articulation and growth of skeletal elements in balanid barnacles (Balanidae, Balanomorpha, Cirripedia)
title_full Articulation and growth of skeletal elements in balanid barnacles (Balanidae, Balanomorpha, Cirripedia)
title_fullStr Articulation and growth of skeletal elements in balanid barnacles (Balanidae, Balanomorpha, Cirripedia)
title_full_unstemmed Articulation and growth of skeletal elements in balanid barnacles (Balanidae, Balanomorpha, Cirripedia)
title_short Articulation and growth of skeletal elements in balanid barnacles (Balanidae, Balanomorpha, Cirripedia)
title_sort articulation and growth of skeletal elements in balanid barnacles (balanidae, balanomorpha, cirripedia)
topic Biology (Whole Organism)
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6774972/
https://www.ncbi.nlm.nih.gov/pubmed/31598290
http://dx.doi.org/10.1098/rsos.190458
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