Halechiniscidae nouveaux de sables coralliens tropicaux (Tardigrada, Arthrotardigrada)

Renaud-Mornant, Jeanne

doi:10.5962/p.287524

Cited by 15 publications

(2 citation statements)

References 4 publications

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“…The highest genetic distance for the 28S sequence was calculated within the clades forming the paraphyletic Arthrotardigrada, suggesting a high substitution rate (Jørgensen et al 2010) and/or an old lineage age (Cádiz et al 2018). An old lineage age of these marine heterotardigrades supports the assumption that tardigrades originated from the sea (Kristensen, 1981;Renaud-Mornant, 1982;Jørgensen et al 2010). The marine origin is further supported by the basal position of the marine Echiniscoididae within Echiniscoidea, with the remaining echiniscoidean taxa being limno-terrestrial.…”

Section: Discussionsupporting

confidence: 58%

Actinarctus doryphorus (Tanarctidae) DNA barcodes and phylogenetic reinvestigation of Arthrotardigrada with new A. doryphorus and Echiniscoididae sequences

GROLLMANN,

JØRGENSEN,

MØBJERG

2023

Zootaxa

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Little is still known about the diversity and evolution of marine arthrotardigrades, as they are generally difficult to sample, resulting in a limited amount of molecular data for barcoding and phylogenetic studies. With the current study, we provide the first investigation into COI haplotype diversity in a marine tanarctid and at the same time readdress arthrotardigrade phylogeny. Specifically, we provide COI mtDNA, 18S and 28S rDNA sequences from a population of Actinarctus doryphorus (Tanarctidae) sampled off the coast of Roscoff, France and further provide new 18S sequences from two marine echiniscoidids. A. doryphorus COI sequences confirmed the presence of a single species and further revealed five haplotypes shared among nine sequenced individuals. Our 18S and 28S rDNA datasets were individually and combined analysed with Bayesian inference and Maximum Likelihood. Actinarctus doryphorus was placed together with Tanarctus sequences within a maximally supported Tanarctidae, confirming previous interpretations that the clade is distinct from Halechiniscidae. Although several studies in recent decades have concluded that the marine arthrotardigrades are paraphyletic, recent studies have argued that the clade may not be paraphyletic. Our phylogenetic analyses consistently inferred Arthrotardigrada as paraphyletic, as the clade includes the monophyletic Echiniscoidea. Accordingly, we propose that it is time to suppress the order Arthrotardigrada as it clearly does not reflect tardigrade phylogeny.

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Section: Discussionsupporting

confidence: 58%

Actinarctus doryphorus (Tanarctidae) DNA barcodes and phylogenetic reinvestigation of Arthrotardigrada with new A. doryphorus and Echiniscoididae sequences

GROLLMANN,

JØRGENSEN,

MØBJERG

2023

Zootaxa

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“…50%) found at depths from 1473 to 9540 m. The factors responsible for the distribution of deep-sea tardigrades remain unclear. However, there is evidence that a higher diversity has been registered in medium to coarse sediments, especially in carbonate sands deposited in shallow environments [26][27][28]. Data analyses indicate the high richness and peculiarity of marine tardigrade fauna [11,[28][29][30][31][32].…”

Section: Discussionmentioning

confidence: 99%

Deep-Sea Tardigrades from the North-Western Pacific, with Descriptions of Two New Species

et al. 2022

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Three deep-sea tardigrade species were identified from the sediment samples collected during the four German–Russian joint deep-sea cruises that were conducted in the North-Western Pacific: Coronarctus sonne sp. nov., Moebjergarctus okhotensis sp. nov., and Angursa cf. bicuspis. Specimens of those species were collected at depths between 1700 and 5410 m. The new species Coronarctus sonne sp. nov. belongs to the Cor. tenellus group of species on the basis of morphological traits such as the short cephalic appendages and heteromorphic claws. The structure of the secondary clavae and two points, with an accessory point and a primary point simultaneously on the internal and external claws on legs IV, are significant characteristics distinguishing Coronarctus sonne sp. nov. from other described species. Moebjergarctus okhotensis sp. nov. is characterized by having cephalic cirri with the long smooth portion of the scapus and annulated scapus only in the basal portion, the structure of the male and female reproductive system, and differences in the sizes of some structures compared to the other described species. An analysis of the results of four deep-sea expeditions indicates a patchy distribution of tardigrades in the North-Western Pacific.

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Tardigrade Taxa

Degma¹,

Guidetti²

2018

Zoological Monographs

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Halechiniscidae nouveaux de sables coralliens tropicaux (Tardigrada, Arthrotardigrada)

Cited by 15 publications

References 4 publications

Actinarctus doryphorus (Tanarctidae) DNA barcodes and phylogenetic reinvestigation of Arthrotardigrada with new A. doryphorus and Echiniscoididae sequences

Actinarctus doryphorus (Tanarctidae) DNA barcodes and phylogenetic reinvestigation of Arthrotardigrada with new A. doryphorus and Echiniscoididae sequences

Deep-Sea Tardigrades from the North-Western Pacific, with Descriptions of Two New Species

Tardigrade Taxa

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