| Summary: | A novel Gram-negative, aerobic, motile, lemon-yellow-colored, and non-spore-forming rod-shaped bacterium designated strain NZ-12B<sup>T</sup> was isolated in February 2021 from a sponge species (<i>Crateromorpha</i>) collected at the southern Kermadec Ridge, Pacific Ocean, New Zealand. Comparative 16S rRNA gene-based analyses indicated that strain NZ-12B<sup>T</sup> shared 98.58%, 96.44%, 96.23%, and 94.78% 16S rRNA sequence similarity to <i>Alteriqipengyuania lutimaris</i> S-5<sup>T</sup>, <i>Qipengyuania pelagi</i> UST081027-248<sup>T</sup><i>, Qipengyuania citreus</i> RE35F/1<sup>T</sup>, and <i>Alteriqipengyuania halimionae</i> CPA5<sup>T</sup>, respectively. The major respiratory quinone was ubiquinone-10(Q-10). The polar lipid profile of NZ-12B<sup>T</sup> was composed of diphosphatidylglycerol, phosphatidylethanolamine, phosphatidyl-N-methyl-ethanolamine, phosphatidylcholine, sphingoglycolipid, phosphatidylglycerol, one unknown polar lipid, three unknown phospholipids, and three unknown glycolipids. The major fatty acids of strain NZ-12B<sup>T</sup> were C<sub>18:1</sub>ω12t, C<sub>16:0</sub>, C<sub>17:1</sub>ω6c, and C<sub>14:0</sub>2-OH. Carotenoids were present. Genome mining analysis revealed a biosynthetic gene cluster encoding for the terpene biosynthesis. Pairwise ANI and dDDH values of strain NZ-12B<sup>T</sup> and closely related phylogenetic neighbors were below the threshold values of 95% and 70%, respectively. The DNA G+C content was 65.4 mol% (by genome). Based on data obtained by a polyphasic approach, type strain NZ-12B<sup>T</sup> (=DSM 112810<sup>T</sup> = NCCB 100841<sup>T</sup>) represents a novel species of the genus <i>Alteriqipengyuania</i>, for which the name <i>Alteriqipengyuania abyssalis</i> sp. nov. is proposed.
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