Phylogeny and Morphology of New Diplonemids from Japan

作者：Tashyreva Daria; Prokopchuk Galina; Yabuki Akinori; Kaur Binnypreet; Faktorova Drahomira; Votypka Jan; Kusaka Chiho; Fujikura Katsunori; Shiratori Takashi; Ishida Ken Ichiro; Horak Ales; Lukes Julius^*

来源：Protist, 2018, 169(2): 158-179.

DOI：10.1026/j.protis.2018.02.001

• Diplonema
• ultrastructure
• phylogeny
• Euglenozoa
• description
• flagellates

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 mitochondria! 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.

• 出版日期2018-4