Genus Ensifer

Warning: In the List of Prokaryotic names with Standing in Nomenclature, an arrow () only indicates the sequence of valid publication of names and does not mean that the last name in the sequence must be used (see: Introduction).

Number of species cited in this file: 14
Number of subspecies cited in this file: 0

Classification (Warning: see also the file "Classification of prokaryotes: Introduction").

 

Ensifer Casida 1982, gen. nov.
Type species: ¤ Ensifer adhaerens Casida 1982.
Etymology: L. adj. ensifer, sword-bearing; N.L. masc. Ensifer, sword bearer.
Reference: CASIDA Jr. (L.E.): Ensifer adhaerens gen. nov., sp. nov.: a bacterial predator of bacteria in soil. Int. J. Syst. Bacteriol., 1982, 32, 339-345.
Original article in IJSEM Online

Ensifer Casida 1982 emend. Young 2003.
Type species: ¤ Ensifer adhaerens Casida 1982.
Etymology: L. adj. ensifer, sword-bearing; N.L. masc. Ensifer, sword bearer.
Reference: YOUNG (J.M.): The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination 'Sinorhizobium adhaerens' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 2107-2110.
Original article in IJSEM Online

Note:
. According to the "Subcommittee on the taxonomy of Agrobacterium and Rhizobium" [1], the genus Ensifer and the genus ¤ Sinorhizobium belong to a single taxon and Ensifer has priority. However, there are good reasons for retaining the name ¤ Sinorhizobium over Ensifer; hence, a case to this effect needs to be prepared for consideration by the Judicial Commission. In July 2003, Willems et al. [2] propose the new combination "Sinorhizobium adhaerens" (Casida 1982) Willems et al. 2003 and put forward a Request for an Opinion to the Judicial Commission regarding the conservation of "Sinorhizobium adhaerens" over ¤ Ensifer adhaerens. A new name or new combination subject to a Request for an Opinion should not be considered as validly published unless the Judicial Commision votes to approve the Request.
. According to J.M. Young [3], there is no justification in the Bacteriological Code (1990 Revision) for this step. This author [3] proposed that ¤ Ensifer adhaerens Casida 1982 be the legitimate nomenclature and requested for a Judicial Opinion.
. At its meetings in July 2005 at the IUMS Congress in San Francisco, the Judicial Commission of the International Committee on Systematics of Prokaryotes [4] ruled on the Requests for an Opinion of Willems et al. [2] and J.M. Young [3]. The genus name Ensifer Casida 1982 has priority over the genus name Sinorhizobium Chen et al. 1988, and the two names have been shown by Willems et al. [2] to be synonyms. It was generally felt that the transfer of the members of the genus Sinorhizobium to the genus Ensifer would not cause confusion and, therefore, the Judicial Commission [4] denied the request to conserve the genus name Sinorhizobium Chen et al. 1988 over the genus name Ensifer Casida 1982. A direct result of this ruling is that the name "Sinorhizobium adhaerens" Willems et al. 2003 is also not validly published, since it was proposed in anticipation of this Opinion [4].
. According to the "Subcommittee on the taxonomy of Agrobacterium and Rhizobium" [5], phylogenies based on several core genes suggest that ¤ Ensifer adhaerens and ¤ Sinorhizobium morelense form a sister clade to the rest of the Sinorhizobium species [Martens et al., Int. J. Syst. Evol. Microbiol., 2007, 57, 489-503]. If confirmed, this could be a basis for retaining ¤ Sinorhizobium and Ensifer as distinct genera.
. At its meetings in August 2008 [6], the "Subcommittee on the taxonomy of Agrobacterium and Rhizobium" did not disagree with the interpretation of the Judicial Commission. However, the subcommittee disagrees with the justification. The transfer of the members of the genus Sinorhizobium to the genus Ensifer would cause great confusion in the scientific community. At a session of the 8th European Nitrogen Fixation Conference on 31 August 2008, an overwhelming majority of those present indicated that they were not in favour of changing the name from Sinorhizobium to Ensifer. In 2010, J.M. Young [7] comments and disapproves the decision of the subcommittee.
References:
1 LINDSTRÖM (K.) and MARTINEZ-ROMERO (M.E.): International Committee on Systematics of Prokaryotes Subcommittee on the taxonomy of Agrobacterium and Rhizobium. Minutes of the meeting, 4 July 2001, Hamilton, Canada. Int. J. Syst. Evol. Microbiol., 2002, 52, 2337.
Minutes of the meeting, 4 July 2001, Hamilton, Canada in IJSEM Online
2 WILLEMS (A.), FERNÁNDEZ-LÓPEZ (M.), MUÑOZ-ADELANTADO (E.), GORIS (J.), DE VOS (P.), MARTÍNEZ-ROMERO (E.), TORO (N.) and GILLIS (M.): Description of new Ensifer strains from nodules and proposal to transfer Ensifer adhaerens Casida 1982 to Sinorhizobium as Sinorhizobium adhaerens comb. nov. Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 1207-1217.
Original article by Willems et al. 2003 in IJSEM Online
3 YOUNG (J.M.): The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination 'Sinorhizobium adhaerens' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 2107-2110.
Original article by Young 2003 in IJSEM Online
4 JUDICIAL COMMISSION OF THE INTERNATIONAL COMMITTEE ON SYSTEMATICS OF PROKARYOTES: The genus name Sinorhizobium Chen et al. 1988 is a later synonym of Ensifer Casida 1982 and is not conserved over the latter genus name, and the species name 'Sinorhizobium adhaerens' is not validly published. Opinion 84. Int. J. Syst. Evol. Microbiol., 2008, 58, 1973.
Opinion 84 in IJSEM Online
5 LINDSTRÖM (K.) and MARTÍNEZ-ROMERO (E.): International Committee on Systematics of Prokaryotes Subcommittee on the taxonomy of Agrobacterium and Rhizobium. Minutes of the meeting, 23-24 July 2006, Århus, Denmark. Int. J. Syst. Evol. Microbiol., 2007, 57, 1365-1366.
Original article in IJSEM Online
6 LINDSTRÖM (K.) and YOUNG (J.P.W.): International Committee on Systematics of Prokaryotes Subcommittee on the taxonomy of Agrobacterium and Rhizobium. Minutes of the meetings, 31 August 2008, Gent, Belgium. Int. J. Syst. Evol. Microbiol., 2009, 59, 921-922.
Minutes of the meetings, 31 August 2008, Gent, Belgium in IJSEM Online
7 YOUNG (J.M.): Sinorhizobium versus Ensifer: may a taxonomy subcommittee of the ICSP contradict the Judicial Commission?. Int. J. Syst. Evol. Microbiol., 2010, 60, 1711-1713.
Original article in IJSEM Online

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Ensifer adhaerens Casida 1982, sp. nov. (Type species of the genus.)
Type strain: (see also StrainInfo.net) strain A = ATCC 33212 = JCM 21105 = LMG 20216 = NBRC 100388.
Sequence accession no. (16S rRNA gene) for the type strain: AM181733.
Etymology: L. part. adj. adhaerens, adhering to.
Reference: CASIDA Jr. (L.E.): Ensifer adhaerens gen. nov., sp. nov.: a bacterial predator of bacteria in soil. Int. J. Syst. Bacteriol., 1982, 32, 339-345.
Original article in IJSEM Online

Notes:
1 Phylogenetically, Ensifer Casida 1982 and ¤ Sinorhizobium Chen et al. 1988 may be regarded as a single genus. Because ¤ Sinorhizobium was proposed in 1988, the older name Ensifer has priority. However, there are several reasons why a change from Sinorhizobium to Ensifer may not be the best solution and making an exception to Rule 38 may be more appropriate. Willems et al. [1] propose the new combination "Sinorhizobium adhaerens" (Casida 1982) Willems et al. 2003 and put forward a Request for an Opinion to the Judicial Commission regarding the conservation of "Sinorhizobium adhaerens" over Ensifer adhaerens. This proposal was previously expressed by the "Subcommittee on the taxonomy of Agrobacterium and Rhizobium" [2]. A new name or new combination subject to a Request for an Opinion should not be considered as validly published unless the Judicial Commision votes to approve the Request. Consequently, the proposal of "Sinorhizobium adhaerens" (Casida 1982) Willems et al. 2003 is not validly published and illegitimate. According to J.M. Young [3], there is no justification in the Bacteriological Code (1990 Revision) for the proposal of the new combination "Sinorhizobium adhaerens" (Casida 1982) Willems et al. 2003. This author [3] proposed that ¤ Ensifer adhaerens Casida 1982 be the legitimate nomenclature and requested for a Judicial Opinion.
At its meetings in July 2005 at the IUMS Congress in San Francisco, the Judicial Commission of the International Committee on Systematics of Prokaryotes [4] ruled on the Requests for an Opinion of Willems et al. [1] and Young [2]. The genus name Ensifer Casida 1982 has priority over the genus name Sinorhizobium Chen et al. 1988, and the two names have been shown by Willems et al. [1] to be synonyms. It was generally felt that the transfer of the members of the genus Sinorhizobium to the genus Ensifer would not cause confusion and, therefore, the Judicial Commission [4] denied the request to conserve the genus name Sinorhizobium Chen et al. 1988 over the genus name Ensifer Casida 1982. A direct result of this ruling is that the name "Sinorhizobium adhaerens" Willems et al. 2003 is also not validly published, since it was proposed in anticipation of this Opinion [4].
At its meetings in August 2008 [5], the "Subcommittee on the taxonomy of Agrobacterium and Rhizobium" did not disagree with the interpretation of the Judicial Commission. However, the subcommittee disagrees with the justification. The transfer of the members of the genus Sinorhizobium to the genus Ensifer would cause great confusion in the scientific community. At a session of the 8th European Nitrogen Fixation Conference on 31 August 2008, an overwhelming majority of those present indicated that they were not in favour of changing the name from Sinorhizobium to Ensifer. In 2010, J.M. Young [6] comments and disapproves the decision of the subcommittee.
References:
1 WILLEMS (A.), FERNÁNDEZ-LÓPEZ (M.), MUÑOZ-ADELANTADO (E.), GORIS (J.), DE VOS (P.), MARTÍNEZ-ROMERO (E.), TORO (N.) and GILLIS (M.): Description of new Ensifer strains from nodules and proposal to transfer Ensifer adhaerens Casida 1982 to Sinorhizobium as Sinorhizobium adhaerens comb. nov. Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 1207-1217.
Original article by Willems et al. 2003 in IJSEM Online
2 LINDSTRÖM (K.) and MARTINEZ-ROMERO (M.E.): International Committee on Systematics of Prokaryotes Subcommittee on the taxonomy of Agrobacterium and Rhizobium. Minutes of the meeting, 4 July 2001, Hamilton, Canada. Int. J. Syst. Evol. Microbiol., 2002, 52, 2337.
Minutes of the meeting, 4 July 2001, Hamilton, Canada in IJSEM Online
3 YOUNG (J.M.): The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination 'Sinorhizobium adhaerens' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 2107-2110.
Original article by Young 2003 in IJSEM Online
4 JUDICIAL COMMISSION OF THE INTERNATIONAL COMMITTEE ON SYSTEMATICS OF PROKARYOTES: The genus name Sinorhizobium Chen et al. 1988 is a later synonym of Ensifer Casida 1982 and is not conserved over the latter genus name, and the species name 'Sinorhizobium adhaerens' is not validly published. Opinion 84. Int. J. Syst. Evol. Microbiol., 2008, 58, 1973.
Opinion 84 in IJSEM Online
5 LINDSTRÖM (K.) and YOUNG (J.P.W.): International Committee on Systematics of Prokaryotes Subcommittee on the taxonomy of Agrobacterium and Rhizobium. Minutes of the meetings, 31 August 2008, Gent, Belgium. Int. J. Syst. Evol. Microbiol., 2009, 59, 921-922.
Minutes of the meetings, 31 August 2008, Gent, Belgium in IJSEM Online
6 YOUNG (J.M.): Sinorhizobium versus Ensifer: may a taxonomy subcommittee of the ICSP contradict the Judicial Commission?. Int. J. Syst. Evol. Microbiol., 2010, 60, 1711-1713.
Original article in IJSEM Online
2 According to Young 2003, Ensifer adhaerens Casida 1982 emend. Young 2003 is an earlier heterotypic synonym of ¤ Sinorhizobium morelense Wang et al. 2002.
Reference: YOUNG (J.M.): The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination 'Sinorhizobium adhaerens' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 2107-2110.
Original article in IJSEM Online
3 According to Martens et al. 2007, ¤ Sinorhizobium morelense Wang et al. 2002 is not a later heterotypic synonym of Ensifer adhaerens Casida 1982, but represents a separate species of the genus ¤ Ensifer Casida 1982 emend. Young 2003.
Reference: MARTENS (M.), DELAERE (M.), COOPMAN (R.), DE VOS (P.), GILLIS (M.) and WILLEMS (A.): Multilocus sequence analysis of Ensifer and related taxa. Int. J. Syst. Evol. Microbiol., 2007, 57, 489-503.
Original article in IJSEM Online

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Ensifer arboris (Nick et al. 1999) Young 2003, comb. nov.
Type strain: (see also StrainInfo.net) strain TTR 38 = ATCC BAA-226 = DSM 13375 = HAMBI 1552 = LMG 14919 = NBRC 100383.
Sequence accession no. (16S rRNA gene) for the type strain: Z78204.
Basonym: ¤ Sinorhizobium arboris Nick et al. 1999.
Etymology: L. n. arbor, tree; L. gen. n. arboris, of a tree.
Reference: YOUNG (J.M.): The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination 'Sinorhizobium adhaerens' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 2107-2110.
Original article in IJSEM Online

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Ensifer fredii (Scholla and Elkan 1984) Young 2003, comb. nov.
Type strain: (see also StrainInfo.net) strain PRC 205 = ATCC 35423 = CCUG 27877 = DSM 5851 = HAMBI 2075 = ICMP 11139 = IFO (now NBRC) 14780 = JCM 20967 = LMG 6217 = NRRL B-14241 = NRRL B-14594 = USDA 205.
Sequence accession no. (16S rRNA gene) for the type strain: X67231.
Basonym: ¤ Rhizobium fredii Scholla and Elkan 1984 emend. De Lajudie et al. 1994.
Other synonym: ¤ Sinorhizobium fredii (Scholla and Elkan 1984) Chen et al. 1988.
Etymology: N.L. gen. n. fredii, of Fred, named after of E.B. Fred.
Reference: YOUNG (J.M.): The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination 'Sinorhizobium adhaerens' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 2107-2110.
Original article in IJSEM Online

Note: According to Martens et al. 2008, Ensifer fredii (Scholla and Elkan 1984) Young 2003 is an earlier heterotypic synonym of ¤ Ensifer xinjiangensis (Chen et al. 1988) Young 2003.
Reference: MARTENS (M.), DAWYNDT (P.), COOPMAN (R.), GILLIS (M.), DE VOS (P.) and WILLEMS (A.): Advantages of multilocus sequence analysis for taxonomic studies: a case study using 10 housekeeping genes in the genus Ensifer (including former Sinorhizobium). Int. J. Syst. Evol. Microbiol., 2008, 58, 200-214.
Original article in IJSEM Online

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Ensifer garamanticus Merabet et al. 2010, sp. nov.
Type strain: (see also StrainInfo.net) strain ORS 1400 = CIP 109916 = LMG 24692.
Sequence accession no. (16S rRNA gene) for the type strain: AY500255.
Etymology: L. masc. adj. garamanticus, Garamantian, pertaining to Garamante, the country of Garamantes, from which the strains were isolated.
Reference: MERABET (C.), MARTENS (M.), MAHDHI (M.), ZAKHIA (F.), SY (A.), LE ROUX (C.), DOMERGUE (O.), COOPMAN (R.), BEKKI (A.), MARS (M.), WILLEMS (A.) and DE LAJUDIE (P.): Multilocus sequence analysis of root nodule isolates from Lotus arabicus (Senegal), Lotus creticus, Argyrolobium uniflorum and Medicago sativa (Tunisia) and description of Ensifer numidicus sp. nov. and Ensifer garamanticus sp. nov. Int. J. Syst. Evol. Microbiol., 2010, 60, 664-674.
Original article in IJSEM Online

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Ensifer kostiensis (Nick et al. 1999) Young 2003, comb. nov.
Type strain: (see also StrainInfo.net) strain TTR 15 = ATCC BAA-227 = DSM 13372 = HAMBI 1489 = LMG 15613 = LMG 19227 = NBRC 100382.
Sequence accession no. (16S rRNA gene) for the type strain: AM181747.
Basonym: ¤ Sinorhizobium kostiense Nick et al. 1999.
Etymology: N.L. masc. adj. kostiensis, pertaining to Kosti, the region in Sudan where most of these organisms have been isolated.
Reference: YOUNG (J.M.): The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination 'Sinorhizobium adhaerens' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 2107-2110.
Original article in IJSEM Online

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Ensifer kummerowiae (Wei et al. 2002) Young 2003, comb. nov.
Type strain: (see also StrainInfo.net) strain AS 1.3046 = CCBAU 71714 = CIP 108026 = NBRC 100799.
Sequence accession no. (16S rRNA gene) for the type strain: AY034028.
Basonym: ¤ Sinorhizobium kummerowiae Wei et al. 2002.
Etymology: N.L. gen. n. kummerowiae, of Kummerowia, a genus of leguminous plants, referring to the host from which the bacterium was isolated.
Reference: YOUNG (J.M.): The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination 'Sinorhizobium adhaerens' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 2107-2110.
Original article in IJSEM Online

Note: According to Rules 27(3) and 30, this name is not validly published, because the original publication makes reference to the deposit of the type strain in a single recognized culture collection. However, according to the Judicial Opinion 81, Ensifer kummerowiae (Wei et al. 2002) Young 2003 is considered to be validly published, since deposit in a second culture collection in a different country has been documented.
References:
1 EUZÉBY (J.P.) and TINDALL (B.J.): Status of strains that contravene Rules 27(3) and 30 of the Bacteriological Code. Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2004, 54, 293-301.
Original article in IJSEM Online
2 JUDICIAL COMMISSION OF THE INTERNATIONAL COMMITTEE ON SYSTEMATICS OF PROKARYOTES: Status of strains that contravene Rules 27 (3) and 30 of the International Code of Nomenclature of Bacteria. Opinion 81. Int. J. Syst. Evol. Microbiol., 2008, 58, 1755-1763.
Opinion 81 in IJSEM Online

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Ensifer medicae (Rome et al. 1996) Young 2003, comb. nov.
Type strain: (see also StrainInfo.net) strain 11-3 21a = A 321 = HAMBI 2306 = ICMP 13798 = LMG 19920 = NBRC 100384 = USDA 1037.
Sequence accession no. (16S rRNA gene) for the type strain: not found.
Basonym: ¤ Sinorhizobium medicae Rome et al. 1996.
Etymology: L. gen. n. medicae, of/from lucern (plant belonging to the genus Medicago).
Reference: YOUNG (J.M.): The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination 'Sinorhizobium adhaerens' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 2107-2110.
Original article in IJSEM Online

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Ensifer meliloti (Dangeard 1926) Young 2003, comb. nov.
Type strain: (see also StrainInfo.net) strain ATCC 9930 = CCUG 27879 = CFBP 5561 = DSM 30135 = HAMBI 2148 = ICMP 12623 = IFO (now NBRC) 14782 = JCM 20682 = LMG 6133 = NCAIM B.01520 = NRRL L-45 = NZP 4027 = USDA 1002.
Sequence accession no. (16S rRNA gene) for the type strain: D14509.
Basonym: ¤ Rhizobium meliloti Dangeard 1926 (Approved Lists 1980).
Other synonym: ¤ Sinorhizobium meliloti (Dangeard 1926) De Lajudie et al. 1994.
Etymology: N.L. n. Melilotus, generic name of sweet clover; N.L. gen. n. meliloti, of Melilotus.
Reference: YOUNG (J.M.): The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination 'Sinorhizobium adhaerens' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 2107-2110.
Original article in IJSEM Online

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Ensifer mexicanus Lloret et al. 2011, sp. nov.
Type strain: (see also StrainInfo.net) strain ITTG R7 = ATCC BAA-1312 = CFN ER1001 = CIP 109033 = HAMBI 2910.
Sequence accession no. (16S rRNA gene) for the type strain: DQ411930.
Etymology: N.L. masc. adj. mexicanus, of or belonging to Mexico, where the strains were isolated.
References: VALIDATION LIST no. 138. Int. J. Syst. Evol. Microbiol., 2011, 61, 475-476. [LLORET (L.), ORMEÑO-ORRILLO (E.), RINCÓN (R.), MARTÍNEZ-ROMERO (J.), ROGEL-HERNÁNDEZ (M.A.) and MARTÍNEZ-ROMERO (E.): Ensifer mexicanus sp. nov. a new species nodulating Acacia angustissima (Mill.) Kuntze in Mexico. Syst. Appl. Microbiol., 2007, 30, 280-290.]
Validation List no. 138 in IJSEM Online - Effective publication Online

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Ensifer numidicus Merabet et al. 2010, sp. nov.
Type strain: (see also StrainInfo.net) strain ORS 1407 = CIP 109850 = LMG 24690.
Sequence accession no. (16S rRNA gene) for the type strain: AY500254.
Etymology: L. masc. adj. numidicus, Numidian, pertaining to the country of Numidia, the Roman denomination of the region in North Africa from which the majority of the organisms were isolated.
Reference: MERABET (C.), MARTENS (M.), MAHDHI (M.), ZAKHIA (F.), SY (A.), LE ROUX (C.), DOMERGUE (O.), COOPMAN (R.), BEKKI (A.), MARS (M.), WILLEMS (A.) and DE LAJUDIE (P.): Multilocus sequence analysis of root nodule isolates from Lotus arabicus (Senegal), Lotus creticus, Argyrolobium uniflorum and Medicago sativa (Tunisia) and description of Ensifer numidicus sp. nov. and Ensifer garamanticus sp. nov. Int. J. Syst. Evol. Microbiol., 2010, 60, 664-674.
Original article in IJSEM Online

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Ensifer saheli (De Lajudie et al. 1994) Young 2003, comb. nov.
Type strain: (see also StrainInfo.net) strain ORS 609 = ATCC 51690 = DSM 11273 = HAMBI 215 = ICMP 13648 = LMG 7837 = NBRC 100386 = ORS 609.
Sequence accession no. (16S rRNA gene) for the type strain: X68390.
Basonym: ¤ Sinorhizobium saheli De Lajudie et al. 1994.
Etymology: N.L. gen. n. saheli, of the Sahel, the region in Africa from which they were isolated.
Reference: YOUNG (J.M.): The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination 'Sinorhizobium adhaerens' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 2107-2110.
Original article in IJSEM Online

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Ensifer sojae Li et al. 2011, sp. nov.
Type strain: (see also StrainInfo.net) strain CCBAU 05684 = HAMBI 3098 = LMG 25493.
Sequence accession no. (16S rRNA gene) for the type strain: GU593061.
Etymology: N.L. gen. n. sojae, of soja, of soybean, referring to the source of the first isolates.
Reference: LI (Q.Q.), WANG (E.T.), CHANG (Y.L.), ZHANG (Y.Z.), ZHANG (Y.M.), SUI (X.H.), CHEN (W.F.) and CHEN (W.X.): Ensifer sojae sp. nov., isolated from root nodules of Glycine max grown in saline-alkaline soils. Int. J. Syst. Evol. Microbiol., 2011, 61, 1981-1988.
Original article in IJSEM Online

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Ensifer terangae (De Lajudie et al. 1994) Young 2003, comb. nov.
Type strain: (see also StrainInfo.net) strain ATCC 51692 = DSM 11282 = HAMBI 220 = ICMP 13649 = LMG 7834 = NBRC 100385 = ORS 1009.
Sequence accession no. (16S rRNA gene) for the type strain: X68388.
Basonym: ¤ Sinorhizobium terangae corrig. De Lajudie et al. 1994.
Etymology: N.L. n. terenga (from West African Wolof n. terenga, hospitality), hospitality; N.L. gen. n. terangae, of hospitality; intended to mean that this species is isolated from different host plants.
Reference: YOUNG (J.M.): The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination 'Sinorhizobium adhaerens' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 2107-2110.
Original article in IJSEM Online

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Ensifer xinjiangensis (Chen et al. 1988) Young 2003, comb. nov.
Type strain: (see also StrainInfo.net) strain ATCC 49357 = CCBAU 110 = DSM 5852 = HAMBI 1673 = ICMP 11141 = JCM 21035 = LMG 17930 = NBRC 100018.
Sequence accession no. (16S rRNA gene) for the type strain: EU152397.
Basonym: ¤ Sinorhizobium xinjiangense corrig. Chen et al. 1988.
Etymology: N.L. masc. adj. xinjiangensis, pertaining to the suburbs of Xinjiang, China.
Reference: YOUNG (J.M.): The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination 'Sinorhizobium adhaerens' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion. Int. J. Syst. Evol. Microbiol., 2003, 53, 2107-2110.
Original article in IJSEM Online

¤ Ensifer fredii (Scholla and Elkan 1984) Young 2003.

Note: According to Martens et al. 2008, Ensifer xinjiangensis (Chen et al. 1988) Young 2003 is a later heterotypic synonym of ¤ Ensifer fredii (Scholla and Elkan 1984) Young 2003.
Reference: MARTENS (M.), DAWYNDT (P.), COOPMAN (R.), GILLIS (M.), DE VOS (P.) and WILLEMS (A.): Advantages of multilocus sequence analysis for taxonomic studies: a case study using 10 housekeeping genes in the genus Ensifer (including former Sinorhizobium). Int. J. Syst. Evol. Microbiol., 2008, 58, 200-214.
Original article in IJSEM Online  

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