Definition
Cetobacterium ceti is a bacterial species belonging to the genus Cetobacterium within the family Fusobacteriaceae. It has been reported as being isolated from the gastrointestinal tract of marine mammals, specifically cetaceans.
Overview
The genus Cetobacterium comprises obligate anaerobic, Gram‑negative rods that are commonly associated with the intestinal microbiota of fish and other aquatic vertebrates. Species of this genus are noted for producing vitamin B₁₂ and for contributing to the host’s digestive processes. C. ceti is presumed to share these ecological roles within cetacean hosts, although the extent of its functional significance remains under investigation.
Etymology / Origin
The specific epithet “ceti” is derived from the Latin cetus meaning “whale” or “large sea‑fish,” indicating the organism’s association with cetacean hosts.
Characteristics
| Feature | Description |
|---|---|
| Cell morphology | Short, rod‑shaped cells, typical of Fusobacteria; dimensions are not precisely documented. |
| Gram stain | Gram‑negative. |
| Oxygen requirement | Obligate anaerobe; growth occurs only under oxygen‑free conditions. |
| Metabolism | Fermentative; likely capable of producing short‑chain fatty acids and vitamin B₁₂, as observed in other Cetobacterium species. |
| Optimal growth conditions | Specific temperature and pH ranges for C. ceti have not been definitively reported; related species grow best at 25‑30 °C under anaerobic conditions. |
| Genomic information | Whole‑genome sequences, if available, have not been widely deposited in public databases; therefore, detailed genetic characteristics are not confirmed. |
| Isolation source | Reported from intestinal content or fecal samples of cetaceans (e.g., dolphins). |
Related Topics
- Cetobacterium somerae – The best‑characterized species of the genus, isolated from the gut of freshwater fish and noted for vitamin B₁₂ synthesis.
- Fusobacteriaceae – The bacterial family encompassing Cetobacterium and related genera, many of which are anaerobic and inhabit animal GI tracts.
- Marine mammal microbiome – The broader community of microorganisms residing in cetacean gastrointestinal systems, influencing nutrition, immunity, and health.
- Anaerobic gut bacteria – A functional group of microbes that carry out fermentation processes essential for host digestion in oxygen‑limited environments.
Notes on Current Knowledge
Accurate information about Cetobacterium ceti is limited, and many of its physiological and genomic attributes remain to be fully characterized in peer‑reviewed literature. Further isolation, sequencing, and phenotypic studies are required to confirm its taxonomic status and ecological role.