Escherichia marmotae

Escherichia marmotae is gram-negative, non-motile, non-sporulating, and facultatively anaerobic. It tests positive for catalase, and negative for oxidase, urease, and indole. Cells take the form of short rods with widths ranging from 0.5-1 µm and lengths ranging from 1-2.5 µm. Colonies, when grown on LB agar for 24 hours at 37°C, appear circular, convex, and grayish white, measuring roughly 2 mm in diameter. Growth occurs between 25-37°C, with optimal growth observed at 37°C. E. marmotae is capable of fermentation of certain carbohydrates, including mannitol, rhamnose, xylose, sorbitol, and glycerol. E. marmotae is motile, although motility has been observed to decrease when grown at higher temperatures due to a reduction in motility-related gene expression.