NCBI
NCBI Taxonomy taxdump · 2026-10-23taxid: 817
Bacteria > Bacteroidota > Bacteroidia > Bacteroidales > Bacteroidaceae > Bacteroides > Bacteroides fragilis
Bacteroides fragilis
Species in genus Bacteroides, family Bacteroidaceae (order Bacteroidales). (from NCBI Taxonomy lineage)
Warning: This taxon splits 1→many across databases. Read the panels carefully.
Names over time
Loading the names
Cross-database view
GTDB
- Bacteroides fragilis
- Bacteroides hominis
- +20 more — see all names below
id: s__Bacteroides fragilis / s__Bacteroides hominis · GTDB R232
At its weakest, linked by GTDB's own NCBI species id rather than the genome's raw one.
d__Bacteria;p__Bacteroidota;c__Bacteroidia;o__Bacteroidales;f__Bacteroidaceae;g__Bacteroides;s__Bacteroides fragilis
Warning: GTDB R232 places this taxon's 983 genomes in 2 species.
Name differs between releases: Name differs across GTDB releases.
SILVA
Bacteroides fragilis
id: JN084198 · SILVA 138.2
Linked by name — the SILVA table we ingest carries no NCBI taxid, so the binomial is the only join.
Bacteria;Bacteroidota;Bacteroidia;Bacteroidales;Bacteroidaceae;Bacteroides;
Greengenes2
Bacteroides_H_857956 fragilis
id: Bacteroides_H_857956 fragilis (+4) · Greengenes2 2024.09
Linked via GTDB R220 genome accessions — the same physical genomes, not a name match.
d__Bacteria; p__Bacteroidota; c__Bacteroidia; o__Bacteroidales; f__Bacteroidaceae; g__Bacteroides_H_857956; s__Bacteroides_H_857956 fragilis
Name differs between releases: Name differs across Greengenes2 releases.
eHOMD
release 4.2No record in eHOMD 4.2.
Each panel shows one release. Switch a release to see how that database's answer changes — the taxon is held fixed by NCBI taxid, so every panel describes the same organism. Each panel also says how it was linked; how the databases are joined explains the routes.
Lineage by rank
| rank | NCBI | GTDB R232 | SILVA 138.2 | Greengenes2 2024.09 |
|---|---|---|---|---|
| domain | Bacteria | Bacteria | Bacteria | Bacteria |
| phylum | Bacteroidota | Bacteroidota | Bacteroidota | Bacteroidota |
| class | Bacteroidia | Bacteroidia | Bacteroidia | Bacteroidia |
| order | Bacteroidales | Bacteroidales | Bacteroidales | Bacteroidales |
| family | Bacteroidaceae | Bacteroidaceae | Bacteroidaceae | Bacteroidaceae |
| genus | Bacteroides | Bacteroides | Bacteroides | first rank that differs from NCBI: Bacteroides_H_857956 |
| species | Bacteroides fragilis | Bacteroides fragilis | — | Bacteroides_H_857956 fragilis |
Each column is the release its box shows. marks the first rank at which a database's name differs from NCBI's, by exact text; a suffix such as _A counts. SILVA's path and eHOMD's columns end at genus, so their species row is blank; the box above names the species. Levels a source labels outside these seven ranks are in the API's ranks and not drawn here.
Names in NCBI
from NCBI Taxonomy taxdump · 2026-10-23- Bacteroides fragiliscurrent
- Bacteroides fragilis (Veillon and Zuber 1898) Castellani and Chalmers 1919 (Approved Lists 1980)synonym
- Bacteroides inaequalissynonym
- Bacteroides incommunissynonym
- Bacteroides uncatussynonym
- Fusiformis fragilissynonym
- Pseudobacterium fragilissynonym
- Pseudobacterium inaequalissynonym
- Pseudobacterium incommunissynonym
- Pseudobacterium uncatumsynonym
- Ristella fragilissynonym
- Ristella incommunissynonym
- Ristella uncatasynonym
- Sphaerophorus inaequalissynonym
- Sphaerophorus intermediussynonym
Other names in these databases
GTDB R232
- Bacteroides fragilis
- Bacteroides hominis
- Allobosea sp943370645
- Bacteroides fragilis_B
- Bacteroides ovatus
- Bacteroides thetaiotaomicron
- CAG-841 sp000437375
- CAMDBI01 sp945889005
- Coprococcus aceti
- Cryptobacteroides sp030529945
- Enterosoma sp963589675
- Enterousia sp963630775
- Gemmiger qucibialis
- JACABE01 sp903936865
- JJ008 sp943372905
- Paragemmobacter sp958439195
- Phil1 sp001940855
- Prevotella fragilis_A
- Prevotella sp963590505
- Sodaliphilus sp963641805
- UBA3282 sp023664485
- W3P20-009 sp963616565
SILVA 138.264 of 71
- Bacteroides fragilis
- Bacteroides fragilis CL03T00C08
- Bacteroides fragilis CL05T00C42
- Bacteroides fragilis str. S6R5
- Bacteroides fragilis 638R
- Bacteroides fragilis NCTC 9343
- Bacteroides fragilis YCH46
- Bacteroides fragilis str. 1007-1-F #3
- Bacteroides fragilis str. S36L12
- Bacteroides fragilis CL07T12C05
- Bacteroides fragilis HMW 610
- Bacteroides fragilis HMW 615
- Bacteroides fragilis str. 1007-1-F #10
- Bacteroides fragilis str. 1007-1-F #8
- Bacteroides fragilis str. 3725 D9 ii
- Bacteroides fragilis str. 3783N1-6
- Bacteroides fragilis str. 3976T8
- Bacteroides fragilis str. 3998 T(B) 4
- Bacteroides fragilis str. 3998T(B)3
- Bacteroides fragilis str. S24L15
- Bacteroides fragilis CL03T12C07
- Bacteroides fragilis str. 1007-1-F #6
- Bacteroides fragilis str. 3725 D9(v)
- Bacteroides fragilis str. DS-208
- Bacteroides fragilis str. Korea 419
- Bacteroides fragilis str. S24L26
- Bacteroides fragilis str. S36L11
- Bacteroides fragilis str. 1007-1-F #5
- Bacteroides fragilis str. 1009-4-F #7
- Bacteroides fragilis str. 20793-3
- Bacteroides fragilis str. 3719 A10
- Bacteroides fragilis str. 3719 T6
- Bacteroides fragilis str. 3774 T13
- Bacteroides fragilis str. 3986 N(B)19
- Bacteroides fragilis str. DS-71
- Bacteroides fragilis str. Ds-233
- Bacteroides fragilis str. J38-1
- Bacteroides fragilis CL07T00C01
- Bacteroides fragilis str. 1007-1-F #7
- Bacteroides fragilis str. 1009-4-F #10
- Bacteroides fragilis str. 2-F-2 #5
- Bacteroides fragilis str. 3397 N3
- Bacteroides fragilis str. 3783N1-2
- Bacteroides fragilis str. 3986 N(B)22
- Bacteroides fragilis str. 3986 N3
- Bacteroides fragilis str. A7 (UDC12-2)
- Bacteroides fragilis str. B1 (UDC16-1)
- Bacteroides fragilis str. S23L17
- Bacteroides fragilis str. S6L5
- Bacteroides fragilis 3_1_12
- Bacteroides fragilis HMW 616
- Bacteroides fragilis JCM 11017
- Bacteroides fragilis str. 1007-1-F #9
- Bacteroides fragilis str. 2-F-2 #7
- Bacteroides fragilis str. 3-F-2 #6
- Bacteroides fragilis str. 3397 N2
- Bacteroides fragilis str. 3397 T10
- Bacteroides fragilis str. 3397 T14
- Bacteroides fragilis str. 3783N2-1
- Bacteroides fragilis str. 3976T7
- Bacteroides fragilis str. DS-166
- Bacteroides fragilis str. I1345
- Bacteroides fragilis str. J-143-4
- Bacteroides fragilis str. S23 R14
- …and 7 more, not listed — this taxon is a large placeholder bucket in SILVA 138.2.
Greengenes2 2024.09
- Bacteroides_H_857956 fragilis
- Escherichia ruysiae
- Phascolarctobacterium_A_40086 faecium
- Romboutsia_C hominis
- Thomasclavelia ramosa