Homology of the head sensory structures between Heterotardigrada and Eutardigrada supported in a new species of water bear (Ramazzottiidae: Ramazzottius)
Phylum Tardigrada is represented by microscopic eight-legged panarthropods that inhabit terrestrial and marine environments. Although tardigrades are emerging model animals for areas of research including physiology, evolutionary biology, and astrobiology, knowledge of their external morphology rema...
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ftpubmed:oai:pubmedcentral.nih.gov:10680360 2023-12-31T10:06:22+01:00 Homology of the head sensory structures between Heterotardigrada and Eutardigrada supported in a new species of water bear (Ramazzottiidae: Ramazzottius) Kihm, Ji-Hoon Zawierucha, Krzysztof Rho, Hyun Soo Park, Tae-Yoon S. 2023-11-27 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10680360/ http://www.ncbi.nlm.nih.gov/pubmed/38012802 https://doi.org/10.1186/s40851-023-00221-w en eng BioMed Central http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10680360/ http://www.ncbi.nlm.nih.gov/pubmed/38012802 http://dx.doi.org/10.1186/s40851-023-00221-w © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/ (https://creativecommons.org/publicdomain/zero/1.0/) ) applies to the data made available in this article, unless otherwise stated in a credit line to the data. Zoological Lett Research Article Text 2023 ftpubmed https://doi.org/10.1186/s40851-023-00221-w 2023-12-03T01:56:08Z Phylum Tardigrada is represented by microscopic eight-legged panarthropods that inhabit terrestrial and marine environments. Although tardigrades are emerging model animals for areas of research including physiology, evolutionary biology, and astrobiology, knowledge of their external morphology remains insufficient. For instance, homologies between marine and terrestrial relatives largely remain unexplored. In the present study we provide detailed pictures of the head sensory organs in a new tardigrade, Ramazzottius groenlandensis sp. nov. Specimens were collected from a mixed moss and lichen sample on Ella Island, East Greenland. The new species differs from congeneric species in the presence of polygonal sculpturing on the dorsal cuticle, which is accentuated in the posterior region of the body, a lateral papilla on leg IV, and distinctive egg morphology. A Bayesian phylogenetic analysis (18S rRNA + 28S rRNA + COI) places the new species within the genus Ramazzottius with high confidence. Interestingly, the new species shows a full set of well-developed cephalic organs, which correspond to all sensory fields found in eutardigrades. Details on the full set of head organs were present only for heterotardigrades. The surface of these organs is covered with small pores, which presumably play a sensory role. This discovery suggests the homology of head sensory structures between heterotardigrades and eutardigrades, implying that the distinctive arrangement and positioning of sensory organs on the head is a plesiomorphic feature of tardigrades. Moreover, we find that the Ramazzottius oberhaeuseri morphotype forms a morphogroup, not a monophyletic species complex. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s40851-023-00221-w. Text East Greenland Greenland Tardigrade water bear PubMed Central (PMC) Zoological Letters 9 1 |
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Research Article Kihm, Ji-Hoon Zawierucha, Krzysztof Rho, Hyun Soo Park, Tae-Yoon S. Homology of the head sensory structures between Heterotardigrada and Eutardigrada supported in a new species of water bear (Ramazzottiidae: Ramazzottius) |
topic_facet |
Research Article |
description |
Phylum Tardigrada is represented by microscopic eight-legged panarthropods that inhabit terrestrial and marine environments. Although tardigrades are emerging model animals for areas of research including physiology, evolutionary biology, and astrobiology, knowledge of their external morphology remains insufficient. For instance, homologies between marine and terrestrial relatives largely remain unexplored. In the present study we provide detailed pictures of the head sensory organs in a new tardigrade, Ramazzottius groenlandensis sp. nov. Specimens were collected from a mixed moss and lichen sample on Ella Island, East Greenland. The new species differs from congeneric species in the presence of polygonal sculpturing on the dorsal cuticle, which is accentuated in the posterior region of the body, a lateral papilla on leg IV, and distinctive egg morphology. A Bayesian phylogenetic analysis (18S rRNA + 28S rRNA + COI) places the new species within the genus Ramazzottius with high confidence. Interestingly, the new species shows a full set of well-developed cephalic organs, which correspond to all sensory fields found in eutardigrades. Details on the full set of head organs were present only for heterotardigrades. The surface of these organs is covered with small pores, which presumably play a sensory role. This discovery suggests the homology of head sensory structures between heterotardigrades and eutardigrades, implying that the distinctive arrangement and positioning of sensory organs on the head is a plesiomorphic feature of tardigrades. Moreover, we find that the Ramazzottius oberhaeuseri morphotype forms a morphogroup, not a monophyletic species complex. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s40851-023-00221-w. |
format |
Text |
author |
Kihm, Ji-Hoon Zawierucha, Krzysztof Rho, Hyun Soo Park, Tae-Yoon S. |
author_facet |
Kihm, Ji-Hoon Zawierucha, Krzysztof Rho, Hyun Soo Park, Tae-Yoon S. |
author_sort |
Kihm, Ji-Hoon |
title |
Homology of the head sensory structures between Heterotardigrada and Eutardigrada supported in a new species of water bear (Ramazzottiidae: Ramazzottius) |
title_short |
Homology of the head sensory structures between Heterotardigrada and Eutardigrada supported in a new species of water bear (Ramazzottiidae: Ramazzottius) |
title_full |
Homology of the head sensory structures between Heterotardigrada and Eutardigrada supported in a new species of water bear (Ramazzottiidae: Ramazzottius) |
title_fullStr |
Homology of the head sensory structures between Heterotardigrada and Eutardigrada supported in a new species of water bear (Ramazzottiidae: Ramazzottius) |
title_full_unstemmed |
Homology of the head sensory structures between Heterotardigrada and Eutardigrada supported in a new species of water bear (Ramazzottiidae: Ramazzottius) |
title_sort |
homology of the head sensory structures between heterotardigrada and eutardigrada supported in a new species of water bear (ramazzottiidae: ramazzottius) |
publisher |
BioMed Central |
publishDate |
2023 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10680360/ http://www.ncbi.nlm.nih.gov/pubmed/38012802 https://doi.org/10.1186/s40851-023-00221-w |
genre |
East Greenland Greenland Tardigrade water bear |
genre_facet |
East Greenland Greenland Tardigrade water bear |
op_source |
Zoological Lett |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10680360/ http://www.ncbi.nlm.nih.gov/pubmed/38012802 http://dx.doi.org/10.1186/s40851-023-00221-w |
op_rights |
© The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/ (https://creativecommons.org/publicdomain/zero/1.0/) ) applies to the data made available in this article, unless otherwise stated in a credit line to the data. |
op_doi |
https://doi.org/10.1186/s40851-023-00221-w |
container_title |
Zoological Letters |
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9 |
container_issue |
1 |
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1786838375677820928 |