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Phylogeny and Morphology of New Diplonemids from Japan.
- Source :
- Protist; Apr2018, Vol. 169 Issue 2, p158-179, 22p
- Publication Year :
- 2018
-
Abstract
- Diplonemids were recently found to be the most species-rich group of marine planktonic protists. Based on phylogenetic analysis of 18S rRNA gene sequences and morphological observations, we report the description of new members of the genus Rhynchopus – R. humris sp. n. and R. serpens sp. n., and the establishment of two new genera – Lacrimia gen. n. and Sulcionema gen. n., represented by L. lanifica sp. n. and S. specki sp. n., respectively. In addition, we describe the organism formerly designated as Diplonema sp. 2 (ATCC 50224) as Flectonema neradi gen. n., sp. n. The newly described diplonemids share a common set of traits. Cells are sac-like but variable in shape and size, highly metabolic, and surrounded by a naked cell membrane, which is supported by a tightly packed corset of microtubules. They carry a single highly reticulated peripheral mitochondrion containing a large amount of mitochondrial DNA, with lamellar cristae. The cytopharyngeal complex and flagellar pocket are contiguous and have separate openings. Two parallel flagella are inserted sub-apically into a pronounced flagellar pocket. Rhynchopus species have their flagella concealed in trophic stages and fully developed in swimming stages, while they permanently protrude in all other known diplonemid species. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14344610
- Volume :
- 169
- Issue :
- 2
- Database :
- Supplemental Index
- Journal :
- Protist
- Publication Type :
- Academic Journal
- Accession number :
- 129648305
- Full Text :
- https://doi.org/10.1016/j.protis.2018.02.001