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Two extremely halophilic archaeal strains, designated SB29 T and SB3 T , were isolated from the brine-seawater interface of Discovery Deep in the Red Sea. Cells of both strains were pleomorphic (irregular polyhedrals, ovals, and rods) and stained Gram-negative; colonies were pigmented pink. The sequence similarity of the 16S rRNA gene of strain SB29 T with that of its most closely related validly described species ( Hfx. sulfurifontis DSM 16227 T ) and that of strain SB3 T with its closest validly described relative ( Hfx. denitrificans ATCC 35960 T ) was 98.1% and 98.6%, respectively. The incomplete draft genomes of SB29 T and SB3 T are 3,871,125 bp and 3,904,985 bp in size, respectively, and their DNA G + C contents are 60.75% and 65.64%, respectively. The highest ANI values between the genomes of SB29 T and SB3 T and the most closely related genomes in GenBank were determined as 82.6% ( Hfx. sulfurifontis ATCC BAA-897 T , GenBank accession no. GCA_000337835.1) and 92.6% ( Haloferax denitrificans ATCC 35960 T , GenBank accession no. GCA_000337795.1), respectively. These data indicate that the two new isolates cannot be classified into any recognized species of the genus Haloferax , and, therefore, two novel species of the genus Haloferax are proposed: Haloferax profundi sp. nov. (type strain SB29 T = JCM 19567 T = CGMCC 1.14960 T ) and Haloferax marisrubri sp. nov. (type strain SB3 T = JCM 19566 T = CGMCC 1.14958 T ).

Haloferax profundi sp. nov. and Haloferax marisrubri sp. nov., Isolated from the Discovery Deep Brine-Seawater Interface in the Red Sea