title: Morphology and molecular phylogeny of three marine Condylostoma species from China, including two new ones (Ciliophora, Heterotrichea).
abstract: The present study investigates the morphologic and molecular characteristics of three Condylostoma species isolated from brackish and marine tropical habitats of China, including Condylostoma tropicum spec. nov., Condylostoma elongatum spec. nov. and Condylostoma curvum Burkovsky, 1970. The two new species have slender and elongated bodies with the posterior portion distinctly narrowed, forming long tails, thus they obviously differ from most congeners. In addition, Condylostoma tropicum spec. nov. is characterized by its small buccal cavity, single frontal cirrus, 26-33 somatic kineties, and moniliform macronucleus composed of 8-22 nodules. Condylostoma elongatum spec. nov. is distinguished by its huge body size (1000-1200μm long in vivo), the prominent buccal cavity, 5-7 frontal cirri and 37-43 somatic kineties. Condylostoma curvum is also reinvestigated in this paper using both protargol impregnation and molecular techniques. Phylogenetic analyses based on SSU rDNA sequence data indicate that the three organisms are located within the genus Condylostoma; the genus Condylostoma fails to form a monophyletic branch in both Maximum-likelihood tree and Bayesian inference analysis. Nonetheless, the AU test shows that the monophyly of Condylostoma could not be rejected.
authors.affiliation: Laboratory of Protozoology, Institute of Evolution & Marine Biodiversity, Ocean University of China, Qingdao 266003, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Yan
authors.affiliation: Laboratory of Protozoology, Institute of Evolution & Marine Biodiversity, Ocean University of China, Qingdao 266003, China; Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.
authors.forename: Xumiao
authors.initials: X
authors.lastname: Chen
authors.affiliation: School of Marine Science, Ningbo University, Ningbo 315211, China. Electronic address: xiangruichen@26.com.
authors.forename: Xiangrui
authors.initials: X
authors.lastname: Chen
authors.affiliation: Laboratory of Protozoology, Institute of Evolution & Marine Biodiversity, Ocean University of China, Qingdao 266003, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Gao
authors.affiliation: Zoology Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
authors.forename: Saleh A
authors.initials: SA
authors.lastname: Al-Farraj
authors.affiliation: Zoology Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
authors.forename: Khaled A S
authors.initials: KA
authors.lastname: Al-Rasheid
mesh_terms: D059001:Aquatic Organisms / Q000145:classification / Q000166:cytology / Q000235:genetics; D002681:China; D016798:Ciliophora / Q000145:classification / Q000166:cytology / Q000235:genetics; D010802:Phylogeny; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D013045:Species Specificity
chemical_list: D012337:RNA, Ribosomal, 18S
keywords: Condylostoma; Morphology; New species; Phylogeny