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Chen, Xiangrui,Kim, Ji Hye,Shazib, Shahed Uddin Ahmed,Kwon, Choon Bong,Shin, Mann Kyoon GUSTAV FISCHER VERLAG 2017 EUROPEAN JOURNAL OF PROTISTOLOGY Vol. No.
<P><B>Abstract</B></P> <P>Heterotrichs are generally larger than ciliates of other groups with a seemingly cosmopolitan distribution, and recent studies have demonstrated that they exhibit great biodiversity. In the present work, we investigated the morphology and small subunit rRNA (SSU rRNA) gene sequences of three heterotrichous species, including that of a new one, <I>Anigsteinia paraclarissima</I> spec. nov. The new organism is morphologically very similar to <I>A. clarissima</I>, however, it can be distinguished from the latter by the larger dimensions and more somatic kineties (25–32 vs. 18–26), and its sequence similarity of SSU rRNA gene is 97.14% which indicate that it is a distinct species. Detailed morphological and molecular data for <I>Blepharisma bimicronucleatum</I> are supplied together for the first time in this study. In addition, the morphology of a poorly known species, <I>Spirostomum yagiui</I> is redescribed and an improved species diagnosis is provided. Finally, based on phylogenetic analyses of SSU rRNA gene sequences data, the <I>Spirostomum</I> group contains two main clades based on the type of the macronucleus. <I>Spirostomum yagiui</I> was newly sequenced here and clustered with the other <I>S. yagiui</I> populations and positioned within the <I>Spirostomum</I> assemblage. The <I>Anigsteinia</I> clade, including <I>A. paraclarissima</I> and <I>A. clarissima</I>, clustered within the family Spirostomidae.</P>
New Records of Two Arcuospathidium Subspecies (Ciliophora: Haptoria: Arcuospathidiidae) from Korea
Jang, Seok Won,Nam, Seung Won,Shazib, Shahed Uddin Ahmed,Shin, Mann Kyoon The Korean Society of Systematic Zoology 2022 Animal Systematics, Evolution and Diversity Vol.38 No.4
Arcuospathidium is a haptorian ciliate genus composed of 18 species, and only one species has been reported in Korea. Here, we identify two unrecorded Arcuospathidium subspecies by morphological observation of both living and protargol-impregnated specimens with the small subunit ribosomal RNA (18S rRNA) gene sequence. These subspecies, Arcuospathidium cultriforme cultriforme (Penard, 1922) Foissner, 1984 and A. cultriforme scalpriforme (Kahl, 1930) Foissner, 2003, were isolated from various terrestrial habitats in July and August 2013, respectivley. Arcuospathidium cultriforme cultriforme is similar to A. cultriforme scalpriforme by a knife-shaped body, a twisted-shaped macronucleus, number of dorsal brushes, position of dorsal brushes, and shape of macronucleus but former mainly differs from the body length to oral bulge length ratio (27-38% vs. 41-53%), extrusome (one types vs. three types), cyst shape (roughly faceted wall vs. smooth surface and thin wall) and number of somatic kinety rows(18-30 vs. 30-44). Additionally, we analyzed the 18S rRNA gene sequences of two A. cultriforme subspecies and compared them with the sequences from GenBank to confirm their identification at the molecular level. As the results of genetic analysis, the 18S rRNA gene sequence of the Korean A. cultriforme cultriforme population is most similar to that of Austrian population. Also, the sequence of the Korean A. cultriforme scalpriforme population is most similar to that of another population with some nucleotide differences.