sp. nov., isolated from the respiratory tract of , and sp. nov., isolated from the lung tissue of .

Four Gram-stain-positive, non-motile and asporous bacilli (strains ZJ-599, ZJ-621, MC1420 and MC1482), isolated from animal tissue and environmental samples collected on the Qinghai-Tibet Plateau, PR China, were taxonomically characterized. Based on the results of 16S rRNA gene sequence analyses, the closest relatives of strains ZJ-599 and ZJ-621 were LMM-1653 (97.5 %), M408/89/1 (96.5 %) and OJ8 (96.3 %), whereas strains MC1420 and MC1482 were closest to CCUG 58655 (98.9 %), DSM 20632 (98.4 %) and DSM 44291 (97.9 %). The results of gene sequence similarity analysis indicated that M408/89/1 and CCUG 58655 were closest to strains ZJ-599/ZJ-621 (83.5 %) and MC1420/MC1482 (91.8 %), respectively. The two novel type strains shared a similarity of 95.2 % in 16S rRNA and 81.3 % in gene sequences. The TAP-PCR DNA fingerprint and MALDI-TOF MS spectrum patterns clearly differentiated the novel isolates within and between each pair of strains. Strain ZJ-599 had 21.9-22.4 % digital DNA-DNA hybridization (dDDH) scores with LMM-1653, M408/89/1 and OJ8, and 72.3-72.9 % of average nucleotide identity (ANI) with them. Similarly, strain MC1420 had 22.9-23.7 % dDDH values with CCUG 58655, DSM 20632 and DSM 44291, and 80.4-81.3 % ANI scores with them. Strain ZJ-599 had a 23.1 % dDDH value and 70.5 % ANI score with strain MC1420, both below the corresponding thresholds for species delineation. Strains ZJ-599 and MC1420 both contain mycolic acids and have MK-8(H) and MK-9(H) as the predominant respiratory quinones, -diaminopimelic acid as the diagnostic diamino acid, and C 9 as the main fatty acid. C 8 and C 8 were predominant in strain ZJ-599 in contrast to C 7 being predominant in strain MC1420. The main polar lipids in strain ZJ-599 were diphosphatidylglycerol, phosphatidylinositol and one unidentified glycolipid, while strain MC1420 had diphosphatidylglycerol, phosphatidylglycerol and one unidentified lipid as the major components. Since the two pairs of novel strains (ZJ-599/ZJ-621, MC1420/MC1482) distinctly differ from each other and from their nearest relatives, two novel species of the genus are proposed, namely (type strain ZJ-599=GDMCC 1.1779=JCM 34341) and (type strain MC1420=GDMCC 1.1783=JCM 34340), respectively.