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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...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society
2019
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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. |
format | Online Article Text |
id | pubmed-6774972 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | The Royal Society |
record_format | MEDLINE/PubMed |
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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