G-Equivalent Acceleration Tolerance in the Eutardigrade Species Hypsibius dujardini

Astrobiology ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 55-60 ◽  
Author(s):  
Tarushika Vasanthan ◽  
Lorea Alejaldre ◽  
Jessica Hider ◽  
Shreya Patel ◽  
Nabiha Husain ◽  
...  
Keyword(s):  
Hypsibius Dujardini

An integrative redescription of Hypsibius dujardini (Doyère, 1840), the nominal taxon for Hypsibioidea (Tardigrada: Eutardigrada)

Zootaxa ◽  
2018 ◽  
Vol 4415 (1) ◽  
pp. 45 ◽  
Author(s):  
PIOTR GĄSIOREK ◽  
DANIEL STEC ◽  
WITOLD MOREK ◽  
ŁUKASZ MICHALCZYK
Keyword(s):  
Dna Sequences ◽  
Evolutionary Biology ◽  
Model Organism ◽  
Laboratory Strain ◽  
Sensu Stricto ◽  
Nominal Species ◽  
28S Rrna ◽  
The Family ◽  
The 19Th Century ◽  
Hypsibius Dujardini

A laboratory strain identified as “Hypsibius dujardini” is one of the best studied tardigrade strains: it is widely used as a model organism in a variety of research projects, ranging from developmental and evolutionary biology through physiology and anatomy to astrobiology. Hypsibius dujardini, originally described from the Île-de-France by Doyère in the first half of the 19th century, is now the nominal species for the superfamily Hypsibioidea. The species was traditionally considered cosmopolitan despite the fact that insufficient, old and sometimes contradictory descriptions and records prevented adequate delineations of similar Hypsibius species. As a consequence, H. dujardini appeared to occur globally, from Norway to Samoa. In this paper, we provide the first integrated taxonomic redescription of H. dujardini. In addition to classic imaging by light microscopy and a comprehensive morphometric dataset, we present scanning electron photomicrographs, and DNA sequences for three nuclear markers (18S rRNA, 28S rRNA, ITS-2) and one mitochondrial marker (COI) that are characterised by various mutation rates. The results of our study reveal that a commercially available strain that is maintained in many laboratories throughout the world, and assumed to represent H. dujardini sensu stricto, represents, in fact, a new species: H. exemplaris sp. nov. Redescribing the nominal taxon for Hypsibiidae, we also redefine the family and amend the definitions of the subfamily Hypsibiinae and the genus Hypsibius. Moreover, we transfer H. arcticus (Murray, 1907) and Hypsibius conifer Mihelčič, 1938 to the genus Ramazzottius since the species exhibit claws and eggs of the Ramazzottius type. Finally, we designate H. fuhrmanni as subjectively invalid because the extremely poor description precludes identifying neotype material. 

Soil tardigrades from the Antarctic Peninsula with a description of a new species and some remarks on the genusRamajendas(Eutardigrada: Isohypsibiidae)

Polar Record ◽  
2013 ◽  
Vol 50 (2) ◽  
pp. 176-182 ◽  
Author(s):  
Łukasz Kaczmarek ◽  
Karel Janko ◽  
Jerzy Smykla ◽  
Łukasz Michalczyk
Keyword(s):  
New Species ◽  
Antarctic Peninsula ◽  
Morphometric Characters ◽  
Antarctic Continent ◽  
Fourth Species ◽  
The Antarctic ◽  
A New Species ◽  
Mixed Samples ◽  
Hypsibius Dujardini

ABSTRACTIn thirteen (mostly soil) mixed samples, collected from nine localities on the Antarctic continent and some of the neighbouring islands, 788 specimens and 32 eggs of tardigrades were found. In total, five species were identified:Acutuncus antarcticus, Echiniscus jenningsi,Diphascon(D.)victoriae,Hypsibius dujardiniandRamajendas dastychisp. nov.A. antarcticuswas the most abundant (nearly 90% of all specimens) and was the prevailing taxon found in the majority of locations.R. dastychisp. nov. is the fourth species described in the exclusively Antarctic/sub-Antarctic genus. The new species differs from all other congeners by the presence of four gibbosities on the caudo-dorsal cuticle (configuration II:2–2) and also by some morphometric characters. In this paper we also briefly discuss the taxonomy and zoogeography of the genusRamajendas.

scholarly journals Transcriptome survey of the anhydrobiotic tardigrade Milnesium tardigradum in comparison with Hypsibius dujardini and Richtersius coronifer

BMC Genomics ◽  
2010 ◽  
Vol 11 (1) ◽  
pp. 168 ◽  
Author(s):  
Brahim Mali ◽  
Markus A Grohme ◽  
Frank Förster ◽  
Thomas Dandekar ◽  
Martina Schnölzer ◽  
...  
Keyword(s):  
Hypsibius Dujardini

Integrative description of Hypsibius repentinus sp. nov. (Eutardigrada: Hypsibiidae) from Sweden

2021 ◽  
Vol 30 (1) ◽  
pp. 101-115
Author(s):  
D.V. Tumanov ◽  
G.S. Avdeeva
Keyword(s):  
18S Rrna ◽  
Species Group ◽  
Integrative Approach ◽  
Similar Species ◽  
28S Rrna ◽  
Morphometric Characters ◽  
Morphological Diagnosis ◽  
A New Species ◽  
Scanning Electron ◽  
Hypsibius Dujardini

A new species of tardigrade from the genus Hypsibius Ehrenberg, 1848 is described from the bottom sediments of a small lake in the central part of Scandinavian Peninsula (Sweden), using an integrative approach, i.e. morphological techniques (light and scanning electron microscopy) combined with a molecular analysis (18S rRNA, 28S rRNA, ITS-2 and COI markers). Hypsibius repentinus sp. nov. belongs to the Hypsibius dujardini species–group and differs from the most similar species of this group in having a second macroplacoid with a definite constriction and in some other morphometric characters. Morphological diagnosis for the Hypsibius dujardini species–group is proposed, and its composition is discussed.

Tardigrades from New Brunswick, Canada. 3

1974 ◽  
Vol 52 (7) ◽  
pp. 919-922 ◽  
Author(s):  
C. W. Argue
Keyword(s):  
New Brunswick ◽  
South Central ◽  
Hypsibius Dujardini

Four species of tardigrades, not before reported for Canada, are identified from sites in south central New Brunswick. They are Macrobiotus pullari, Hypsibius (Hypsibius) dujardini, Hypsibius (Diphascon) bullatus, and H. (D.) rugosus.

scholarly journals The tardigrade Hypsibius dujardini, a new model for studying the evolution of development

2007 ◽  
Vol 312 (2) ◽  
pp. 545-559 ◽  
Author(s):  
Willow N. Gabriel ◽  
Robert McNuff ◽  
Sapna K. Patel ◽  
T. Ryan Gregory ◽  
William R. Jeck ◽  
...  
Keyword(s):  
Evolution Of Development ◽  
New Model ◽  
Hypsibius Dujardini
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