Klaveness Dag, Shalchian-Tabrizi Kamran, Thomsen Helge Abildhauge, Eikrem Wenche, Jakobsen Kjetill S
Department of Biology, University of Oslo, PO Box 1066 Blindern, N-0316 Oslo, Norway.
Department of Botany, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 København K, Denmark.
Int J Syst Evol Microbiol. 2005 Nov;55(Pt 6):2595-2604. doi: 10.1099/ijs.0.63652-0.
Telonema is a widely distributed group of phagotrophic flagellates with two known members. In this study, the structural identity and molecular phylogeny of Telonema antarcticum was investigated and a valid description is proposed. Molecular phylogeny was studied using small-subunit rRNA (SSU rRNA) gene sequences. The pear-shaped cell had two subequal flagella that emerged laterally on the truncated antapical tail. One flagellum had tripartite hairs. The cell was naked, but had subsurface vesicles containing angular paracrystalline bodies of an unknown nature. A unique complex cytoskeletal structure, the subcortical lamina, was found to be an important functional and taxonomic feature of the genus. Telonema has an antero-ventral depression where food particles are ingested and then transferred to a conspicuous anterior food vacuole. The molecular phylogeny inferred from the SSU rRNA gene sequence suggested that Telonema represents an isolated and deep branch among the tubulocristate protists.
纤丝虫是一类广泛分布的吞噬性鞭毛虫，已知有两个成员。在本研究中，对南极纤丝虫的结构特征和分子系统发育进行了研究，并给出了有效的描述。利用小亚基核糖体RNA（SSU rRNA）基因序列研究了分子系统发育。梨形细胞有两条大致相等的鞭毛，从截顶的反顶端尾部侧面伸出。一条鞭毛有三联体毛发。细胞裸露，但有含有未知性质角状平行晶体的皮下囊泡。发现一种独特的复杂细胞骨架结构——皮层下薄片，是该属的一个重要功能和分类特征。纤丝虫有一个前腹凹陷，食物颗粒在那里被摄取，然后转移到一个明显的前部食物泡中。从SSU rRNA基因序列推断的分子系统发育表明，纤丝虫在管状嵴原生生物中代表一个孤立的深分支。
