The analysis of inter- and intrapopulation variability of Milnesium eurystomum Maucci, 1991 reveals high genetic divergence and a novel type of ontogenetic variation in the order Apochela
Tardigrada are a phylum of cosmopolitan invertebrates inhabiting both terrestrial and marine ecosystems. The carnivorous species are usually characterized by a wide buccal tube, which constitutes the first and rigid part of the digestive system. Among tardigrades, only the genus Milnesium is conside...
Main Authors: | , , , |
---|---|
Format: | Dataset |
Language: | unknown |
Published: |
Taylor & Francis
2020
|
Subjects: | |
Online Access: | https://dx.doi.org/10.6084/m9.figshare.12853909 https://tandf.figshare.com/articles/dataset/The_analysis_of_inter-_and_intrapopulation_variability_of_i_Milnesium_eurystomum_i_Maucci_1991_reveals_high_genetic_divergence_and_a_novel_type_of_ontogenetic_variation_in_the_order_Apochela/12853909 |
id |
ftdatacite:10.6084/m9.figshare.12853909 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.6084/m9.figshare.12853909 2023-05-15T16:30:30+02:00 The analysis of inter- and intrapopulation variability of Milnesium eurystomum Maucci, 1991 reveals high genetic divergence and a novel type of ontogenetic variation in the order Apochela Morek, Witold Blagden, Brian Kristensen, Reinhardt M. Łukasz Michalczyk 2020 https://dx.doi.org/10.6084/m9.figshare.12853909 https://tandf.figshare.com/articles/dataset/The_analysis_of_inter-_and_intrapopulation_variability_of_i_Milnesium_eurystomum_i_Maucci_1991_reveals_high_genetic_divergence_and_a_novel_type_of_ontogenetic_variation_in_the_order_Apochela/12853909 unknown Taylor & Francis https://dx.doi.org/10.1080/14772000.2020.1771469 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Genetics FOS Biological sciences Evolutionary Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Developmental Biology Plant Biology dataset Dataset 2020 ftdatacite https://doi.org/10.6084/m9.figshare.12853909 https://doi.org/10.1080/14772000.2020.1771469 2021-11-05T12:55:41Z Tardigrada are a phylum of cosmopolitan invertebrates inhabiting both terrestrial and marine ecosystems. The carnivorous species are usually characterized by a wide buccal tube, which constitutes the first and rigid part of the digestive system. Among tardigrades, only the genus Milnesium is considered exclusively carnivorous and includes the largest known species in the phylum. Some members of the genus exhibit developmental variability in taxonomically important morphological traits such as the number of points on the secondary branches of claws and cuticular sculpturing. Milnesium eurystomum is one of the largest tardigrades, with body length reaching 1.2 mm, and it is equipped with an exceptionally wide buccal tube, enabling this animal to feed on various prey, including other tardigrade species. Importantly, M. eurystomum , as well as other species with wide buccal tubes, were described solely using mature females, thus their developmental variability remains unknown. Interestingly, small Milnesium specimens with remarkably wide buccal tubes have never been reported, raising a question of whether such hatchlings and juveniles (first and second life stages) are extremely rare and simply have never been reported, or their buccal apparatus morphology is different from adults and thus constitutes as an undescribed buccal tube developmental variability. To answer this question, we analysed four populations of M. eurystomum originating from Greenland, Svalbard and Scotland. Due to discrepancies in species delineation based on different types of data, we parallelly applied various methods of species delimitation, both morphological and molecular. Thanks to ontogenetic analysis, we show and describe a novel type of developmental variability in the size and shape of the buccal tube. We also provide novel morphological traits and data for this species, together with the first record and characterization of males. Finally, we discuss the consequences of our findings for the taxonomy of Milnesium and tardigrades in general. Dataset Greenland Svalbard Tardigrade DataCite Metadata Store (German National Library of Science and Technology) Svalbard Greenland |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Genetics FOS Biological sciences Evolutionary Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Developmental Biology Plant Biology |
spellingShingle |
Genetics FOS Biological sciences Evolutionary Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Developmental Biology Plant Biology Morek, Witold Blagden, Brian Kristensen, Reinhardt M. Łukasz Michalczyk The analysis of inter- and intrapopulation variability of Milnesium eurystomum Maucci, 1991 reveals high genetic divergence and a novel type of ontogenetic variation in the order Apochela |
topic_facet |
Genetics FOS Biological sciences Evolutionary Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Developmental Biology Plant Biology |
description |
Tardigrada are a phylum of cosmopolitan invertebrates inhabiting both terrestrial and marine ecosystems. The carnivorous species are usually characterized by a wide buccal tube, which constitutes the first and rigid part of the digestive system. Among tardigrades, only the genus Milnesium is considered exclusively carnivorous and includes the largest known species in the phylum. Some members of the genus exhibit developmental variability in taxonomically important morphological traits such as the number of points on the secondary branches of claws and cuticular sculpturing. Milnesium eurystomum is one of the largest tardigrades, with body length reaching 1.2 mm, and it is equipped with an exceptionally wide buccal tube, enabling this animal to feed on various prey, including other tardigrade species. Importantly, M. eurystomum , as well as other species with wide buccal tubes, were described solely using mature females, thus their developmental variability remains unknown. Interestingly, small Milnesium specimens with remarkably wide buccal tubes have never been reported, raising a question of whether such hatchlings and juveniles (first and second life stages) are extremely rare and simply have never been reported, or their buccal apparatus morphology is different from adults and thus constitutes as an undescribed buccal tube developmental variability. To answer this question, we analysed four populations of M. eurystomum originating from Greenland, Svalbard and Scotland. Due to discrepancies in species delineation based on different types of data, we parallelly applied various methods of species delimitation, both morphological and molecular. Thanks to ontogenetic analysis, we show and describe a novel type of developmental variability in the size and shape of the buccal tube. We also provide novel morphological traits and data for this species, together with the first record and characterization of males. Finally, we discuss the consequences of our findings for the taxonomy of Milnesium and tardigrades in general. |
format |
Dataset |
author |
Morek, Witold Blagden, Brian Kristensen, Reinhardt M. Łukasz Michalczyk |
author_facet |
Morek, Witold Blagden, Brian Kristensen, Reinhardt M. Łukasz Michalczyk |
author_sort |
Morek, Witold |
title |
The analysis of inter- and intrapopulation variability of Milnesium eurystomum Maucci, 1991 reveals high genetic divergence and a novel type of ontogenetic variation in the order Apochela |
title_short |
The analysis of inter- and intrapopulation variability of Milnesium eurystomum Maucci, 1991 reveals high genetic divergence and a novel type of ontogenetic variation in the order Apochela |
title_full |
The analysis of inter- and intrapopulation variability of Milnesium eurystomum Maucci, 1991 reveals high genetic divergence and a novel type of ontogenetic variation in the order Apochela |
title_fullStr |
The analysis of inter- and intrapopulation variability of Milnesium eurystomum Maucci, 1991 reveals high genetic divergence and a novel type of ontogenetic variation in the order Apochela |
title_full_unstemmed |
The analysis of inter- and intrapopulation variability of Milnesium eurystomum Maucci, 1991 reveals high genetic divergence and a novel type of ontogenetic variation in the order Apochela |
title_sort |
analysis of inter- and intrapopulation variability of milnesium eurystomum maucci, 1991 reveals high genetic divergence and a novel type of ontogenetic variation in the order apochela |
publisher |
Taylor & Francis |
publishDate |
2020 |
url |
https://dx.doi.org/10.6084/m9.figshare.12853909 https://tandf.figshare.com/articles/dataset/The_analysis_of_inter-_and_intrapopulation_variability_of_i_Milnesium_eurystomum_i_Maucci_1991_reveals_high_genetic_divergence_and_a_novel_type_of_ontogenetic_variation_in_the_order_Apochela/12853909 |
geographic |
Svalbard Greenland |
geographic_facet |
Svalbard Greenland |
genre |
Greenland Svalbard Tardigrade |
genre_facet |
Greenland Svalbard Tardigrade |
op_relation |
https://dx.doi.org/10.1080/14772000.2020.1771469 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.12853909 https://doi.org/10.1080/14772000.2020.1771469 |
_version_ |
1766020238013366272 |