Marivirga tractuosa

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A Microbial Biorealm page on the genus Marivirga tractuosa


Higher order taxa

Picture of Marvirga tractuosa][[1]]

Domain: Bacteria

Phylum: Bacteroidetes

Class: Sphingobacteria

Order: Sphingobacteriales

Family: Flammeovirgaceae

Genus: Marivirga


Marivirga tractuosa Type strain: H-43

Description and significance

Marivirga tractuosa a rod-shaped,gram-negative, pigmented, non-spore forming bacterium. It is a mesophile with optimum growth temperatures from 28-32ºC. It is important because it is resistant to some antibiotics and it has an interesting motility. This microbe has a gliding motility, meaning that it moves by itself without the help of flagella or any external forces. The antibiotics it is resistant to include: gentamicin, kanamycin, neomycin, polymixin and streptomycin.

Genome structure

Marivirga tractousa chromosome is 4,511,574 base pairs long, and the chromosomes are circular. They have a 4916 sequence length, and they have 4516490 nucleotides. It has 3757 protein genes and 49 RNA genes. Its DNA coding region is at 4,029,412 base pair, and its DNA G+C content is 1,604,111 base pairs. Its total number of genes is 3,857. It has 2 rRNA operons, and 51 Psuedo genes.

Cell and colony structure

Marivirga tractuosa are long, slender, flexible rods 10-50 µm in length, 0.4-0.5 µm in width Colonies are circular, shiny and 2-4 mm in diameter after 72 hours of incubation on marine agar (which is a gelling agent from seaweed). They are usually dark-orange in color but whitish or yellow-pigmented are also sometimes present.


It is a strictly aerobic chemoorganotroph, meaning it uses organic compounds as its energy and carbon source. Carbon sources come from glycerol, glucose, galactose, and sucrose. Growth is observed at 10-40ºC and with 0.5–10% NaCl, with optimal growth at 28-32ºC and 4-7% NaCl.


Marvirga tractuosa lives in a habitat that are mostly wet terrestrial habitats. They are also occasionally found in fresh water. Originally found on the beach sand from Nha Trang, Veitnam. Other strains have also been found in a variety of places: mud in the Orne Estuary, France and silty sand in Penang, Malaysia, as well as from brown mud from Muigh Inis, Ireland, underneath frozen sand in the upper littoral zone at Auke Bay, Alaska, red-brown mud from Helgoland Island, Germany, and from brown sand at Moreton Bay, Australia.


It is not reported to be pathogenic.


[[2]Pagani, I.; Chertkov, O., Lapidus, A., Lucas, S., Glavina Del Rio, T., Tice, H., Copeland, A., Cheng, J., Nolan, M., Saunders, E., Pitluck, S., Held, B., Goodwin, L., Liolios, K., Ovchinnikova, G., Ivanova, N., Mavromatis, K., Pati, A., Chen, A., Palaniappan, K., Land, M., Hauser, L., Jeffries, C., Detter, J., Han, C., Tapia, R., Ngatchou, O., Rohde, M., Göker, M., Spring, S., Sikorski, J., Woyke, T., Bristow, J., Eisen, J., Markowitz, V., Hugenholtz, P., Klenk, H., & Kyrpides, N. (2011). Complete genome sequence of Marivirga tractuosa type strain (H-43T). Standards In Genomic Sciences, 4(2). doi:10.4056/sigs.1623941]

[[3]Yoon, Jaewoo, Naoya Oku, Sanghwa Park, Atsuko Katsuta, and Hiroaki Kasai. (2011) "Tunicatimonas Pelagia Gen. Nov., Sp. Nov., a Novel Representative of the Family Flammeovirgaceae Isolated from a Sea Anemone by the Differential Growth Screening Method." Antonie Van Leeuwenhoek 101.1: 133+, doi: 10.1007/s10482-011-9626-6]

[[4]Nedashkovskaya, O. I., M. Vancanneyt, S. B. Kim, and K. S. Bae. "Reclassification of Flexibacter Tractuosus (Lewin 1969) Leadbetter 1974 and 'Microscilla Sericea' Lewin 1969 in the Genus Marivirga Gen. Nov. as Marivirga Tractuosa Comb. Nov. and Marivirga Sericea Nom. Rev., Comb. Nov." International Journal Of Systematic And Evolutionary Microbiology 60.8 (2010): 1858-863. doi: 10.1099/ijs.0.016121-0]

Edited by Edited by Emily Corthell a student of Dr. Lisa R. Moore, University of Southern Maine, Department of Biological Sciences, [5]