Journal
PROTIST
Volume 165, Issue 6, Pages 808-824Publisher
ELSEVIER GMBH
DOI: 10.1016/j.protis.2014.10.003
Keywords
Cercozoa; Marimonadida; heterotrophic flagellate; ultrastructure; phylogenetic analysis; flagellar apparatus
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Funding
- JSPS KAKENHI [13J00587, 21247010]
- Grants-in-Aid for Scientific Research [13J00587] Funding Source: KAKEN
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Abollifer is a little-known genus of marine heterotrophic flagellates with no ultrastructural and molecular information, and its taxonomic position remains uncertain. In this study, we report a new species of Abollifer, Abollifer globosa sp. nov., isolated from a seawater sample collected at Tokyo Bay. To reveal the taxonomic position and morphological characteristics of A. globosa, we performed light and electron microscopic observations and a phylogenetic analysis using small subunit ribosomal DNA sequences. A. globosa cells were 29.5 mu m in length and 22.4 mu m in width, oval or ovoid in shape with an apical projection. Two unequal flagella emerged from a deep subapical flagellar pit. The rim of the flagellar pit except for the ventral side was swollen. Electron microscopic observations showed that A. globosa possessed mitochondria with tubular cristae, a Golgi apparatus, microbodies, extrusomes, and many endosymbiotic bacteria. Basal bodies were arranged in parallel. The flagellar apparatus of A. globosa showed affinity with common gliding cercozoan flagellates. Our phylogenetic tree showed that A. globosa branched as the sister position of order Marimonadida (Imbricatea, Cercozoa). On the basis of the morphological and molecular phylogenetic analysis, we conclude that A. globosa is a new member of the order Marimonadida. (C) 2014 Elsevier GmbH. All rights reserved.
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