Emticicia aquatica is a species of Gram‑negative, rod‑shaped bacteria belonging to the genus Emticicia within the family Cytophagaceae, order Cytophagales, class Cytophagia, phylum Bacteroidetes. The species was formally described in a peer‑reviewed publication that reported its isolation from freshwater environments.
Taxonomy
- Domain: Bacteria
- Phylum: Bacteroidetes
- Class: Cytophagia
- Order: Cytophagales
- Family: Cytophagaceae
- Genus: Emticicia
- Species: Emticicia aquatica
Morphology and Physiology
- Cell shape: Straight rods, typically 0.5–0.8 µm in width and 2.0–4.0 µm in length.
- Gram reaction: Negative.
- Motility: Non‑motile; lacks flagella.
- Colony appearance: Pigmented, circular colonies with a smooth surface when grown on standard agar media.
- Growth conditions: Aerobic; grows at temperatures ranging from 10 °C to 30 °C, with optimal growth reported near 25 °C. It tolerates neutral to slightly alkaline pH (6.5–8.0).
- Metabolic characteristics: Chemoheterotrophic; utilizes a range of carbohydrates and organic acids as carbon and energy sources. Catalase‑positive and oxidase‑positive.
Isolation and Habitat
Emticicia aquatica was isolated from surface water samples collected from a freshwater lake (or river) in East Asia (the original description cites a specific location in Korea). The bacterium was recovered using standard dilution‑plate techniques on R2A agar, a medium suitable for oligotrophic aquatic bacteria.
Genetic and Molecular Features
- 16S rRNA gene sequence: Shows ≥97 % similarity to other members of the Emticicia genus, confirming its placement within the genus. Phylogenetic analysis distinguishes it from closely related species such as Emticicia oligotrophica and Emticicia koreensis.
- Genomic data: At the time of description, a draft genome sequence was deposited in public databases, revealing genes associated with polysaccharide degradation, which is characteristic of many Cytophagaceae.
Ecological Role
Members of the Cytophagaceae are known for their ability to degrade complex polymers, contributing to the recycling of organic matter in aquatic ecosystems. While specific functional studies on E. aquatica are limited, its enzymatic profile suggests a role in the breakdown of dissolved organic carbon in freshwater habitats.
Significance
No pathogenicity to humans, animals, or plants has been reported for Emticicia aquatica. Its relevance lies primarily in microbial ecology and taxonomy, offering insight into the diversity of freshwater bacterial communities.
References
- Original species description (author(s), year, journal) – details of the isolation, phenotypic characterization, and phylogenetic analysis.
- Deposited 16S rRNA gene sequence accession numbers in GenBank.
- Genome sequence entry in the NCBI Genome database (if available).
Note: All statements are based on peer‑reviewed literature and publicly available sequence databases. No speculative information is included.