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Updated: Apr 30, 2026
05:19
Isolation and Identification of Bacterial Strains from Skin of Terrestrial Amphibians
Published on: June 17, 2025
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Thiophaeococcus fuscus sp. nov., isolated from a lagoon.
B Divyasree1, K V N S Lakshmi2, Ch Sasikala1
1Bacterial Discovery Laboratory, Centre for Environment, Institute of Science and Technology, J. N. T. University Hyderabad, Kukatpally, Hyderabad 500085, India.
Summary
A novel bacterium, Thiophaeococcus fuscus, was discovered in lagoon sand. This photoheterotrophic bacterium, strain JA633(T), represents a new species within the Thiophaeococcus genus.
Area of Science:
- Microbiology
- Bacteriology
- Phylogenetics
Background:
- Photoheterotrophic bacteria play roles in aquatic ecosystems.
- The Chromatiaceae family includes important photosynthetic bacteria.
- Understanding bacterial diversity is crucial for ecological studies.
Purpose of the Study:
- To isolate and characterize a novel bacterium from a lagoon environment.
- To determine the phylogenetic and taxonomic position of the novel bacterium.
- To propose a new species and genus classification based on comprehensive data.
Main Methods:
- Isolation of bacteria from black sand using enrichment cultures.
- Morphological, physiological, and chemotaxonomic analyses.
- 16S rRNA gene sequencing and phylogenetic analysis.
- DNA G+C content determination.
Main Results:
- Strain JA633(T) is a Gram-negative, coccoid-spherical, motile bacterium requiring NaCl.
- It possesses internal photosynthetic membranes and exhibits photo-organoheterotrophy.
- Phylogenetic analysis places it as a distinct lineage within the Thiophaeococcus genus.
- It shares 96.9% 16S rRNA gene sequence similarity with Thiorhodococcus kakinadensis.
Conclusions:
- Strain JA633(T) represents a novel species, Thiophaeococcus fuscus.
- The bacterium is phylogenetically distinct from other known Thiophaeococcus species.
- This discovery expands the known diversity of photosynthetic bacteria.
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