| Abiotrophia defectiva | Type Strain | ATCC® 49176™ | December 12, 2022 | 2.0 Mb | | |
| Abiotrophia defectiva | | ATCC® 700209™ | April 29, 2024 | 2.0 Mb | | |
| Acetivibrio aldrichii | Type Strain | ATCC® 49358™ | September 25, 2024 | 6.4 Mb | | |
| Acetivibrio cellulolyticus | Type Strain | ATCC® 33288™ | November 26, 2024 | 6.3 Mb | | |
| Acetivibrio ethanolgignens | Type Strain | ATCC® 33324™ | June 3, 2024 | 4.1 Mb | | |
| Acetivibrio thermocellus | Type Strain | ATCC® 27405™ | August 27, 2019 | 3.8 Mb | | |
| Acetobacter aceti | Type Strain | ATCC® 15973™ | September 29, 2020 | 3.7 Mb | | |
| Acetobacter aceti | | ATCC® 23746™ | January 28, 2021 | 3.7 Mb | | |
| Acetobacterium sp. | | ATCC® BAA-990™ | March 5, 2024 | 4.1 Mb | | |
| Acetobacter pasteurianus subsp. pasteurianus | Type Strain | ATCC® 33445™ | September 13, 2024 | 3.2 Mb | | |
| Acetobacter pasteurianus subsp. pasteurianus | | ATCC® 7839™ | September 5, 2023 | 3.2 Mb | | |
| Acetobacter pasteurianus subsp. pasteurianus | | ATCC® 12879™ | September 29, 2020 | 3.2 Mb | | |
| Acholeplasma axanthum | Type Strain | ATCC® 25176™ | December 15, 2021 | 1.9 Mb | | |
| Acholeplasma cavigenitalium | Type Strain | ATCC® 49901™ | April 29, 2024 | 1.4 Mb | | |
| Acholeplasma granularum | Type Strain | ATCC® 19168™ | November 30, 2021 | 1.5 Mb | | |
| Acholeplasma laidlawii | | ATCC® BAA-3342™ | April 29, 2024 | 1.5 Mb | | |
| Acholeplasma laidlawii | Type Strain | ATCC® 23206™ | December 23, 2021 | 1.5 Mb | | |
| Acholeplasma oculi | Type Strain | ATCC® 27350™ | December 15, 2021 | 1.6 Mb | | |
| Acholeplasma palmae | Type Strain | ATCC® 49389™ | September 13, 2024 | 1.6 Mb | | |
| Acholeplasma pleciae | Type Strain | ATCC® 49582™ | April 29, 2024 | 1.5 Mb | | |
| Acholeplasma vituli | Type Strain | ATCC® 700667™ | September 4, 2024 | 1.9 Mb | | |
| Achromobacter denitrificans | Type Strain | ATCC® 15173™ | February 25, 2023 | 6.7 Mb | | |
| Achromobacter denitrificans | | ATCC® 21988™ | September 5, 2023 | 6.7 Mb | | |
| Achromobacter piechaudii | Type Strain | ATCC® 43552™ | November 26, 2024 | 6.1 Mb | | |
| Achromobacter piechaudii | | ATCC® 43553™ | September 13, 2024 | 6.1 Mb | | |
| Achromobacter xylosoxidans | | ATCC® 9220™ | September 5, 2023 | 6.3 Mb | | |
| Achromobacter xylosoxidans | | ATCC® 212™ | September 5, 2023 | 6.2 Mb | | |
| Achromobacter xylosoxidans | | ATCC® 27063™ | December 12, 2022 | 6.5 Mb | | |
| Achromobacter xylosoxidans | Type Strain | ATCC® 27061™ | September 4, 2024 | 6.8 Mb | | |
| Acidaminococcus fermentans | Type Strain | ATCC® 25085™ | September 13, 2024 | 2.3 Mb | | |