这个词是什么意思？
A genus of anoxygenic, photosynthetic, nonmotile, spherical to slightly ovoid bacterial cells occurring singly, or in aggregates of two or four, and usually surrounded with slime. It is found in stagnant water, mud of ponds, estuaries, and microbial mats of salt marshes. (From Bergey's Manual of Determinative Bacteriology, 9th ed)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D020586 · MeSH 2026。
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