Journal
FRONTIERS IN MICROBIOLOGY
Volume 12, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2021.743920
Keywords
ciliate; morphology; phylogeny; deep sea; Mariana Trench area
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Funding
- China Ocean Mineral Resources Research and Development Association [DY135-B2-13]
- Senior User Project of RV KEXUE [KEXUE2019GZ06]
- Department of Fujian Science and Technology [2018N2001]
- Program for Innovative Research Team in Science and Technology in Fujian Province University
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A new species of Protocruzia, Protocruzia marianaensis sp. n., has been discovered in the deep-sea Pacific Ocean near the Mariana Trench, exhibiting characteristics of a small drop-shaped ciliate with barotolerance and close relation to known Protocruzia species.
A new species of Protocruzia, isolated from the deep-sea Pacific Ocean (>3,000-m depth) in the vicinity of the Mariana Trench, is described based on morphological and molecular data. The systematic status of the ciliate genus Protocruzia has long been highly ambiguous, and Protocruzia species have been assigned to an independent class until recently. In the present study, we described Protocruzia marianaensis sp. n. as a small (25-32 x 14-17 mu m in vivo) drop-shaped ciliate, with longitudinal furrows along the ciliary rows on the right side, six adoral membranelles, eight somatic kineties, and one macronucleus comprising 7-11 nuclear globules. Phylogenetic analyses inferred from small subunit rRNA gene sequences revealed that seven Protocruzia species in the phylogenetic tree formed a fully supported clade representing an independent class. Protocruzia marianaensis sp. n. was established to be most closely related to Protocruzia adhaerens, with a sequence similarity of 96.64%, and was found to be able to survive at both atmospheric pressure and hydrostatic pressure of 320 bar, thereby indicating effective barotolerance.
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