Related Experiment Video
Updated: Apr 12, 2026

Fluorescently Labeled Bacteria as a Tracer to Reveal Novel Pathways of Organic Carbon Flow in Aquatic Ecosystems
Published on: September 13, 2019
Two freshwater Hypotrichidium species (Ciliophora, Hypotrichia) from China, including H. flosaquae n. sp., with notes
Wenxin Xu1, Chenxu Liu2, Jingshun Song2
1State Key Laboratory of Lake and Watershed Science for Water Security, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
Abstract:
Two freshwater hypotrichous ciliates from China, a new species, Hypotrichidium flosaquae n. sp., and, as a first Chinese record, H. bichromum Omar et al., 2025, were studied based on live observations, protargol-stained preparations, and molecular analyses. The new species is characterized by: (1) a pyriform body with an inconspicuous tail-like tip; (2) a question mark-shaped adoral zone occupying about 64% of the body length; (3) undulating membranes in an Australocirrus-like pattern; (4) biconcave, light yellowish-green, sparsely distributed cortical granules; and (5) a cortex densely covered with rod-shaped ectosymbiotic bacteria. Morphogenesis during binary fission generally follows the generic pattern. The Chinese population of H. bichromum aligns with the type population from Korea. However, it displays only pale red cortical granules, probably due to a brief cultivation period, and also shows rod-shaped ectosymbionts. Phylogenetic analyses based on 18S rDNA sequences confirm the monophyly of Hypotrichidium and support the diagnostic value of undulating membrane patterns for species delimitation, recovering two clades: one (including H. paraconicum and H. flosaquae n. sp.) with an Australocirrus-like pattern, and the other (including H. tisiae and H. bichromum) with a Cyrtohymena-like pattern.
More Related Videos
14:38Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
Published on: April 20, 2012
05:34Single-Cell Suspension Preparation from Nile Tilapia Intestine for Single-Cell Sequencing
Published on: February 10, 2023
Related Concept Videos
Anoxygenic Phototrophic Bacteria
Freshwater Microbial Ecology
Hyperthermophilic Bacteria
Diversity of Protists I
Diversity of Protists III
Other Algae