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      Morphology and Molecular Phylogeny of Two Little-Known Species of Loxodes, L. kahli Dragesco & Njiné, 1971 and L. rostrum Müller, 1786 (Protist, Ciliophora, Karyorelictea)

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          Abstract

          The morphology and phylogeny of two little-known species, Loxodes kahli Dragesco & Njiné, 1971 and L. rostrum Müller, 1786, isolated from freshwater muddy sediments in China, were investigated based on live features, infraciliature, and small subunit ribosomal DNA (SSU rDNA) sequence data. Loxodes kahli is distinguished from its congeners mainly by the number and arrangement of macronuclei (6–17 in one row) and the number of right somatic ciliary rows (11–26). The Chinese populations of L. kahli also exhibit differences with other populations in terms of the body size and the number of right ciliary rows. The characteristics of L. rostrum are consistent with those of previous studies except for the number of right ciliary rows (9–10). The studied species were redefined based on the new information and previous descriptions. This study also gave a brief morphological summary of the species in the genus Loxodes by an identification key. SSU rDNA sequence-based phylogenetic analyses revealed that both species are grouped with their congeners, supporting the monophyly of the genus Loxodes.

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          Author and article information

          Journal
          JOUC
          Journal of Ocean University of China
          Science Press and Springer (China )
          1672-5182
          14 May 2019
          01 June 2019
          : 18
          : 3
          : 643-653
          Affiliations
          1 Institute of Evolution and Marine Biodiversity, Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao 266003, China
          Author notes
          *Corresponding author: HU Xiaozhong
          Article
          s11802-019-3897-3
          10.1007/s11802-019-3897-3
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2019.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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          Self URI (journal-page): https://www.springer.com/journal/11802

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