Revisiting kinorhynch segmentation: variation of segmental patterns in the nervous system of three aberrant species
Abstract Background Kinorhynch segmentation differs from the patterns found in Chordata, Arthropoda and Annelida which have coeloms and circulatory systems. Due to these differences and their obsolete status as ‘Aschelminthes’, the microscopic kinorhynchs are often not acknowledged as segmented bila...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2021-10-01
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| Series: | Frontiers in Zoology |
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| Online Access: | https://doi.org/10.1186/s12983-021-00438-5 |
| _version_ | 1818723307893030912 |
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| author | Maria Herranz Taeseo Park Maikon Di Domenico Brian S. Leander Martin V. Sørensen Katrine Worsaae |
| author_facet | Maria Herranz Taeseo Park Maikon Di Domenico Brian S. Leander Martin V. Sørensen Katrine Worsaae |
| author_sort | Maria Herranz |
| collection | DOAJ |
| description | Abstract Background Kinorhynch segmentation differs from the patterns found in Chordata, Arthropoda and Annelida which have coeloms and circulatory systems. Due to these differences and their obsolete status as ‘Aschelminthes’, the microscopic kinorhynchs are often not acknowledged as segmented bilaterians. Yet, morphological studies have shown a conserved segmental arrangement of ectodermal and mesodermal organ systems with spatial correspondence along the anterior-posterior axis. However, a few aberrant kinorhynch lineages present a worm-like body plan with thin cuticle and less distinct segmentation, and thus their study may aid to shed new light on the evolution of segmental patterns within Kinorhyncha. Results Here we found the nervous system in the aberrant Cateria styx and Franciscideres kalenesos to be clearly segmental, and similar to those of non-aberrant kinorhynchs; hereby not mirroring their otherwise aberrant and posteriorly shifted myoanatomy. In Zelinkaderes yong, however, the segmental arrangement of the nervous system is also shifted posteriorly and misaligned with respect to the cuticular segmentation. Conclusions The morphological disparity together with the distant phylogenetic positions of F. kalenesos, C. styx and Z. yong support a convergent origin of aberrant appearances and segmental mismatches within Kinorhyncha. |
| first_indexed | 2024-12-17T21:08:27Z |
| format | Article |
| id | doaj.art-72f833047d794a9fb0b372a7bfd144ec |
| institution | Directory Open Access Journal |
| issn | 1742-9994 |
| language | English |
| last_indexed | 2024-12-17T21:08:27Z |
| publishDate | 2021-10-01 |
| publisher | BMC |
| record_format | Article |
| series | Frontiers in Zoology |
| spelling | doaj.art-72f833047d794a9fb0b372a7bfd144ec2022-12-21T21:32:31ZengBMCFrontiers in Zoology1742-99942021-10-0118112310.1186/s12983-021-00438-5Revisiting kinorhynch segmentation: variation of segmental patterns in the nervous system of three aberrant speciesMaria Herranz0Taeseo Park1Maikon Di Domenico2Brian S. Leander3Martin V. Sørensen4Katrine Worsaae5Department of Biology, University of CopenhagenNational Institute of Biological ResourcesCentro de Estudos do Mar, Universidade Federal do ParanáDepartments of Zoology and Botany, University of British ColumbiaNatural History Museum of Denmark, University of CopenhagenDepartment of Biology, University of CopenhagenAbstract Background Kinorhynch segmentation differs from the patterns found in Chordata, Arthropoda and Annelida which have coeloms and circulatory systems. Due to these differences and their obsolete status as ‘Aschelminthes’, the microscopic kinorhynchs are often not acknowledged as segmented bilaterians. Yet, morphological studies have shown a conserved segmental arrangement of ectodermal and mesodermal organ systems with spatial correspondence along the anterior-posterior axis. However, a few aberrant kinorhynch lineages present a worm-like body plan with thin cuticle and less distinct segmentation, and thus their study may aid to shed new light on the evolution of segmental patterns within Kinorhyncha. Results Here we found the nervous system in the aberrant Cateria styx and Franciscideres kalenesos to be clearly segmental, and similar to those of non-aberrant kinorhynchs; hereby not mirroring their otherwise aberrant and posteriorly shifted myoanatomy. In Zelinkaderes yong, however, the segmental arrangement of the nervous system is also shifted posteriorly and misaligned with respect to the cuticular segmentation. Conclusions The morphological disparity together with the distant phylogenetic positions of F. kalenesos, C. styx and Z. yong support a convergent origin of aberrant appearances and segmental mismatches within Kinorhyncha.https://doi.org/10.1186/s12983-021-00438-5Acetylated tubulinConfocal laser scanning microscopyFMRFamideKinorhynchaMeiofaunaNervous system |
| spellingShingle | Maria Herranz Taeseo Park Maikon Di Domenico Brian S. Leander Martin V. Sørensen Katrine Worsaae Revisiting kinorhynch segmentation: variation of segmental patterns in the nervous system of three aberrant species Frontiers in Zoology Acetylated tubulin Confocal laser scanning microscopy FMRFamide Kinorhyncha Meiofauna Nervous system |
| title | Revisiting kinorhynch segmentation: variation of segmental patterns in the nervous system of three aberrant species |
| title_full | Revisiting kinorhynch segmentation: variation of segmental patterns in the nervous system of three aberrant species |
| title_fullStr | Revisiting kinorhynch segmentation: variation of segmental patterns in the nervous system of three aberrant species |
| title_full_unstemmed | Revisiting kinorhynch segmentation: variation of segmental patterns in the nervous system of three aberrant species |
| title_short | Revisiting kinorhynch segmentation: variation of segmental patterns in the nervous system of three aberrant species |
| title_sort | revisiting kinorhynch segmentation variation of segmental patterns in the nervous system of three aberrant species |
| topic | Acetylated tubulin Confocal laser scanning microscopy FMRFamide Kinorhyncha Meiofauna Nervous system |
| url | https://doi.org/10.1186/s12983-021-00438-5 |
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