acetohalobium arabaticum acetohalobium arabaticum acetohalobium arabaticum is the type species of the genus acetohalobium. it is a prokaryote that can expand its genetic code from 20 to 21 amino acids (by including pyrrolysine) under different conditions of growth. acetohalobium arabaticum scientific classification domain: bacteria phylum: bacillota class: clostridia order: halanaerobiales family: halobacteroidaceae genus: acetohalobium species: a. arabaticum binomial name acetohalobium arabaticum strains strain z-7288t (= dsm 5501 = atcc 49924) is the type strain of the species.