≤10^10 bacteria/ml sponge volume
||Sponges phylum Porifera
||Keren R, Lavy A, Mayzel B, Ilan M. Culturable associated-bacteria of the sponge Theonella swinhoei show tolerance to high arsenic concentrations. Front Microbiol. 2015 Feb 25 6: 154. doi: 10.3389/fmicb.2015.00154. p.1 left column bottom paragraphPubMed ID25762993
||Gloeckner, V., et al. (2014). The HMA-LMA dichotomy revisited: an electron microscopical survey of 56 sponge species. Biol. Bull. 227, 78–88. DOI: 10.1086/BBLv227n1p78PubMed ID25216505
||P.1 left column bottom paragraph: "The coral reef sponge Theonella swinhoei harbors a dense consortium of associated-bacteria, which occupy up to 40% of its body volume (BNID 113271), reaching up to 10^10 bacteria/ml sponge (primary source). T. swinhoei is common in the Indo-Pacific Ocean and its extension, the Red Sea (Ilan et al., 2004). Some of the bacteria inhabiting T. swinhoei are photosynthetic while others are heterotrophic. Most of the bacteria are unicellular but there are also filamentous bacteria (Entotheonella sp., Magnino et al., 1999, Hentschel et al., 2002, Schmitt et al., 2012)."