shewanella benthica shewanella benthica shewanella benthica is an obligately piezophilic bacterium from the genus of shewanella which has been isolated from the sea cucumber psychropotes longicauda from the walvis ridge. shewanella benthica scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: alteromonadales family: shewanellaceae genus: shewanella species: s. benthica binomial name shewanella benthicamacdonell and colwell 1986 type strain atcc 43992, dsm 8812, um 145, w 145