Phylum Actinobacteria, Class Actinobacteria, Subclass Actibacteridae, Order Actynomycetales, Suborder Actinomycinae, Family
Actinomycetaceae, Genus Actinomyces, Actinomyces marimammalium Hoyles, Pascual, Falsen, Foster, Grainger and Collins 2001.
Gram-positive straight to slightly curved rods, some of which exhibit branching.
Non-motile. Non-spore-forming. Non-acid-fast.
Colonies are pin-point to 0.5 mm in diameter at 48 h, irregular, convex, white and
adherent to medium. Grows on Columbia agar (Difco) supplemented with 5% sheep
blood at 37 ºC in air plus 5% CO2. Non-haemolytic. Facultative anaerobic.
Isolated from sea mammals (hooded seal, grey seal and harbour porpoise). Habitat is not known.
One strain was isolated in mixed culture with Escherichia coli, Streptococcus spp. and Actinobacillus spp. from organs (lung, spleen,
liver, kidney, mesenteric lymph node) of a dead male hooded seal (Cystophara cristata) which had suffered from pneumonia.
- Hoyles L., Pascual C., Falsen E., Foster G, Grainger J.M. and Collins M.D., 2001. Actinomyces marimammalium sp. nov., from
marine mammals. Int. J. Syst. Evol. Microbiol. Vol. 51, 151-156.
Description is based on API CORYNE (code 0520162, 0420160, 0520160), API rapid
ID32Strep (code 40016601000, 40002600000, 40016601000) results.
Positive results for beta-galactosidase, leucine arylamidase, acid production from: D-glucose, lactose, maltose &
Negative results for arginine dihydrolase, catalase, esculin hydrolysis, alpha-galactosidase, alpha-glucosidase, beta-glucosidase,
beta-glucuronidase, gelatin hydrolysis, hippurate hydrolysis, alpha-mannosidase, nitrate reduction, pyrazinamidase, pyrrolidonyl
arylamidase, urease, Voges-Proskauer test, acid production from: L-arabinose, D-arabitol, cyclodextrin, mannitol, melibiose,
melezitose, methyl-beta-D-glucopyranoside, pullulan, raffinose, ribose, sorbitol, sucrose (saccharose), tagatose, trehalose & D-xylose.
Variable results for alkaline phosphatase & acid production from glycogen.
(c) Costin Stoica