Ureaplasma ceti
(Segawa et al., 2025)
Etymology
N.L. fem. n. urea – urea, Gr. neut. n. plasma – anything formed, N.L. neut. n. Ureaplasma – urea form referring to a form that utilizes urea; L. gen. n. ceti – of a whale
Taxonomy
Mycoplasmatales – Mycoplasmataceae – Ureaplasma – Ureaplasma ceti (Ureaplasma cluster), next related to Ureaplasma gallorale (16S rRNA gene sequence similarity – 89.90%) (Fig. 1)
Type strain
OM1T (captive pantropical spotted dolphin, Japan, 2019), (Fig. 2, 16S rRNA gene sequence)
Genomes
one draft genome (OM1T – Japan) (NCBI Genome deposit per 19/06/2025)
Cell morphology
pleomorphic
Colony morphology
not described in the original publication
Metabolism
hydrolysis of urea and arginine
Host
pantropical spotted dolphin (Stenella attenuata)
Habitat
forestomach
Disease(s)
unknown
Pathogenicity
considered to exhibit low or no pathogenicity in dolphins
Epidemiology
unknown, isolated once from gastric samples taken from a captive pantropic spotted dolphin at the Okinawa Marine Research Center in Japan
Diagnosis
cultivation and species identification by gene sequence analysis
Fig. 1. Maximum likelihood tree showing the phylogenetic position of Ureaplasma ceti OM1T within the Ureaplasma cluster of Mycoplasmataceae based on 16S rRNA gene sequences. The sequence of Mycoplasma hyopneumoniae JT was used as out-group (Hyopneumoniae cluster). Numbers at nodes represent bootstrap confidence values (1000 replications). Only values > 80% are shown. Bar, number of substitutions per nucleotide position. Credits: Joachim Spergser (Vetmeduni Vienna)
Ureaplasma ceti OM1T
AACGAAGCACTTGTGCTTAGTGGTGAACGGGTGAGTAACACGTATCCAATCTACCTTTAGGATGGGGATAACTGGTCGAAAGACTAGCTAATACCGAATACCAATACTTCTTCGCATGAAGAAATATTGAAAGGTCCTTTACAGGACCGCCTTTAGATGAGGGTGCGGCATATCAGATAGTTGGTGAGGTAACGGCTCACCAAGTCAATGACGTGTAGCTGTACTGAGAGGTAAAACAGCCACAATGGGACTGAGACACGGCCCATACTCCTACGGGAGGCAGCAGTAGGGAATTTTTCACAATGGGCGAAAGCCTGATGGAGCAATGCCGCGTGAATGATGAAGGTCTTACAGATTGTAAAATTCTTTTATTTGGGAAGAACGGTCATAATAGGAAATGATTATGATTTGACTGTACCATTTGAATAAGTATCGGCTAACTATGTGCCAGCAGCCGCGGTAATACATAGGATGCAAGCGTTATCCGGATTTACTGGGCGTAAAACGAGCGCGGGCGGATTATCAAGTTTGGTATGAAAGACTTTTGCTTAACGAAGGTTTGTATCAAAAACTGGTAATCTGGAGTGTAGTAGGGAGTTCTGGAATTCCATGTGGAGCGGTGGAATGCGTAGATATATGGAAGAACACCGGTGGCGAAGGCGAGAACTTAGGCTATCACTGACGCTTAGGCTCGAAAGTGTGGGGAGCAAATAGGATTAGATACCCTAGTAGTCCACACCGTAAACGATGGTTATTAAGTGTCGGCACGAACGTGTCGGCGCTGCAGCTAACGCATTAAATAACCTGCCTGGGTAGTACATTCGCAAGAATGAAACTCAAACGGAATTGACGGGGACCCGCACAAGTGGTGGAGCATGTTGCTTAATTTGACGATACACGTAGAACCTTACCTAGGTTTGACATCTCCTGCAAAGCTATAGAAATATAGTGGAGGTTAACAGGATGACAGGTGGTGCATGGTTGTCGTCAGCTCGTGTCGTGAGATGTTGGGTTAAGTCCCGCAACGAGCGCAACCCCTGTTGCTAGTTAATTTATCTAGCAAGACTGCTGTCGCAAGGCAGAGGAAGGTGGGGATGACGTCAAATCATCATGCCCCTTATATCTAGGGCCGCAAACGTGCTACAATGGACGATACAAACCGTTGCCAAACCGTGAGGTGGAGCCAATCGGAAAAAGTCGTTCTCAGTTCGGATTGGAGGCTGAAATTCGCCTCCATGAAGTTGGAATCACTAGTAATCGCGAATCAGACATGTCGCGGTGAATACGTTCTCGGGTCTTGTACACACCGCCCGTCAAACTATGGGAGCTGATAATATCTGAAACCGTTATGTTAACCGCAAGGAGGCAGACGTCT
Fig. 2. 16S rRNA gene sequence of Ureaplasma ceti OM1T (Accession number: LC794801)