A New Species of Bisexual Milnesium (Eutardigrada: Apochela) Having Aberrant Claws from Innhovde, Dronning Maud Land, East Antarctica

Suzuki, Atsushi C.; Sugiura, Kenta; Tsujimoto, Megumu; Nakai, Ryosuke; McInnes, Sandra J. ORCID: https://orcid.org/0000-0003-3403-9379; Kagoshima, Hiroshi; Imura, Satoshi. 2023 A New Species of Bisexual Milnesium (Eutardigrada: Apochela) Having Aberrant Claws from Innhovde, Dronning Maud Land, East Antarctica. Zoological Science, 40 (3). 246-261. 10.2108/zs220085

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Abstract/Summary

There have been several records in the last 60 years for East Antarctica for Milnesium tardigradum Doyere, 1840 sensu lato, now considered a species complex. During the 56th Japanese Antarctic Research Expedition summer operation (2014-2015), a new tardigrade species in the genus Milnesium Doyere, 1840 was found in an ice-free Innhovde area along Lutzow-Holm Bay, Dronning Maud Land, East Antarctica. The new species has aberrant claws with four to seven points on each secondary claw branch, which distinguishes it from other Milnesium species. A male specimen was found in the population and evidence showed that an isolated adult female moulted twice without oviposition. This strongly suggested bisexual reproduction for this population. The new species, Milnesium rastrum sp. nov., is described with its phylogenetic position and a discussion on the reproductive strategies for the harsh environments.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.2108/zs220085
ISSN:	0289-0003
Additional Keywords:	Lutzow-Holm Bay, tardigrade,bisexual reproduction, Milnesium rastrum, Milnesium tardigradum, Syowa-Station
Date made live:	29 Jun 2023 12:58 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/535119

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