A new freshwater Tardigrada Dactylobiotus kansae sp. n. (Eutardigrada: Parachela: Murrayidae) from Kansas, U.S.A

Beasley, Clark W.; Miller, William R.; Shively, Shawn

doi:10.2988/09-09.1

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…Remarks. Species which belong to the genus Dactylobiotus are characterized in having the same number of macroplacoids, similar shape of AISM and bulbous expansion, and cuticular bars between claws, but differ mostly in the eggshell morphology 38,39,[65][66][67][68][69] . Nevertheless, some morphological traits may have been overlooked in previous, particularly early, descriptions.…”

Section: Description (Figures 1-4 Supplementarymentioning

confidence: 99%

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Integrative description of a new Dactylobiotus (Eutardigrada: Parachela) from Antarctica that reveals an intraspecific variation in tardigrade egg morphology

Kihm

Kim

McInnes

et al. 2020

Sci Rep

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tardigrades constitute one of the most important group in the challenging Antarctic terrestrial ecosystem. Living in various habitats, tardigrades play major roles as consumers and decomposers in the trophic networks of Antarctic terrestrial and freshwater environments; yet we still know little about their biodiversity. The Eutardigrada is a species rich class, for which the eggshell morphology is one of the key morphological characters. Tardigrade egg morphology shows a diverse appearance, and it is known that, despite rare, intraspecific variation is caused by seasonality, epigenetics, and external environmental conditions. Here we report Dactylobiotus ovimutans sp. nov. from King George Island, Antarctica. Interestingly, we observed a range of eggshell morphologies from the new species, although the population was cultured under controlled laboratory condition. Thus, seasonality, environmental conditions, and food source are eliminated, leaving an epigenetic factor as a main cause for variability in this case. Phylum Tardigrada is a microscopic metazoan group, characterized by having four pairs of legs usually terminated with claws, and is considered to be related to the arthropods and onychophorans 1. They have attracted attention due to their cryptobiotic ability 2-7 , which helps them to occupy a variety of habitats throughout the world, including the harsh environments of Antarctica. The challenging environments of Antarctica are represented by a depauperate biodiversity, in which tardigrades have become one of the dominant invertebrate groups 8-13. Around 60 tardigrade species are recorded from Antarctic, with the Antarctic Peninsula having the most rich diversity 14-16. In comparison to the much smaller north polar areas, such as Alaska, Svalbard, or Faroe Island 17-20 , the biodiversity of Antarctic tardigrades is significantly underestimated. King George Island (KGI), the largest in the South Shetland Archipelago, covers about 1300 square kilometres comprising a mountainous landscape that is largely ice-covered with pockets of ice-free coastal regions 21,22. Eight countries operate permanent research bases, with most established at the western end, between Fildes Peninsula and Admiralty Bay. This makes KGI one of the most well studied regions of Antarctica (e.g. refs. 23-26). Compared to the recent studies devoted to marine meiofauna around KGI (see: refs. 27-29), studies on KGI terrestrial invertebrates have received little attention 30-32 , with rather outdated species lists (e.g. ref. 33), and even more so for tardigrades 34-36 .

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Section: Description (Figures 1-4 Supplementarymentioning

confidence: 99%

“…aquatilis Yang, 1999 73 and Dac. henanensis Yang, 2002 74 requires further study, as taxonomically important characters were not described 68,69 . Thus, we compare our specimens with the descriptions of the fourteen widely accepted species.…”

Section: Description (Figures 1-4 Supplementarymentioning

confidence: 99%

Integrative description of a new Dactylobiotus (Eutardigrada: Parachela) from Antarctica that reveals an intraspecific variation in tardigrade egg morphology

Kihm

Kim

McInnes

et al. 2020

Sci Rep

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“…All photomicrographs were made using Phase Contrast Microscopy (PCM). Measurements of the species used in differential diagnosis and the key are given or calculated according to Thulin (1911), Ramazzotti & Maucci (1983), Dastych (1984), Pilato & Binda (1994), Biserov (1998), Binda & Pilato (1999), Yang (1999Yang ( , 2002, Guidetti et al (2006), Kaczmarek et al (2008) and Beasley et al (2009) Adults: Body pale yellow, eyes present (also after preparation). Cuticle smooth, without gibbosities, papillae, spines or sculpture (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Although the genus Dactylobiotus Schuster, 1980 is widespread throughout the world, only 16 species have been described so far (the taxonomic position of Dactylobiotus macronyx (Dujardin, 1851) is still unclear) (Murray 1907a,b;Thulin 1911;Schuster et al 1978 (amended by Kaczmarek & Michalczyk 2010) ;Maucci 1980;Bertolani 1981;Pilato & Binda 1994;Biserov 1998;Binda & Pilato 1999;Yang 1999Yang , 2002Guidetti et al 2006;Kaczmarek et al 2008;Beasley et al 2009). Moreover, two species, Dactylobiotus aquatilis Yang, 1999 and Dactylobiotus henanensis Yang, 2002, are in need of a thorough revision, since taxonomically important characters have not been described for these species (Yang 1999(Yang , 2002.…”

Section: Introductionmentioning

confidence: 96%

A new freshwater eutardigrade from Fiji and Vanuatu (Oceania), with remarks on the genusDactylobiotus

Kaczmarek¹,

Schabetsberger²,

Litwin³

et al. 2012

New Zealand Journal of Zoology

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A new freshwater eutardigrade, Dactylobiotus vulcanus sp. nov. is described from two volcanic crater lakes: Manaro Kesa (Lakua), Ambae Island (Republic of Vanuatu) and Tagimaucia, Taveuni Island (Republic of Fiji). The new species is most similar to Dactylobiotus dervizi and Dactylobiotus luci in the shape of the egg processes, smooth cuticle and the absence of dorso-lateral papillae, but it differs from them mainly by the absence of the oral cavity armature, the presence of eyes, the presence of minute areolation on eggs, and by several morphometric characters of adults and eggs. Additionally, we also discuss taxonomic positions of several dubious species within the genus, and provide the key to all known Dactylobiotus species.

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Phylum Tardigrada

Nelson

2015

Thorp and Covich's Freshwater Invertebrates

146

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A new freshwater Tardigrada Dactylobiotus kansae sp. n. (Eutardigrada: Parachela: Murrayidae) from Kansas, U.S.A

Cited by 6 publications

References 2 publications

Integrative description of a new Dactylobiotus (Eutardigrada: Parachela) from Antarctica that reveals an intraspecific variation in tardigrade egg morphology

Integrative description of a new Dactylobiotus (Eutardigrada: Parachela) from Antarctica that reveals an intraspecific variation in tardigrade egg morphology

A new freshwater eutardigrade from Fiji and Vanuatu (Oceania), with remarks on the genusDactylobiotus

Phylum Tardigrada

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