inet ists ▁Category : Year ▁of ▁birth ▁missing ▁( l iving ▁people ) <0x0A> </s> ▁Seg ment ed ▁fil ament ous ▁b acter ia ▁or ▁C andid atus ▁Sav ag ella ▁are ▁members ▁of ▁the ▁gut ▁micro bi ota ▁of ▁rod ents , ▁fish ▁and ▁ch ick ens , ▁and ▁have ▁been ▁shown ▁to ▁pot ently ▁indu ce ▁imm une ▁responses ▁in ▁m ice . ▁They ▁form ▁a ▁distinct ▁line age ▁within ▁the ▁Clo str idia ceae ▁and ▁the ▁name ▁C andid atus ▁Sav ag ella ▁has ▁been ▁proposed ▁for ▁this ▁line age . ▁ ▁They ▁were ▁previously ▁named ▁C andid atus ▁Ar th rom it us ▁because ▁of ▁their ▁morph ological ▁res embl ance ▁to ▁b acter ial ▁fil aments ▁previously ▁observed ▁in ▁the ▁g uts ▁of ▁insect s ▁by ▁Joseph ▁Le id y . ▁ ▁Despite ▁the ▁fact ▁that ▁they ▁have ▁been ▁widely ▁referred ▁to ▁as ▁segment ed ▁fil ament ous ▁b acter ia , ▁this ▁term ▁is ▁somewhat ▁problem atic ▁as ▁it ▁does ▁not ▁allow ▁one ▁to ▁distinguish ▁between ▁b acter ia ▁that ▁colon ize ▁various ▁hosts ▁or ▁even ▁if ▁segment ed ▁fil ament ous ▁b acter ia ▁are ▁actually ▁several ▁different ▁b acter ial ▁species . ▁In ▁m ice , ▁these ▁b acter ia ▁grow ▁primarily ▁in ▁the ▁terminal ▁i le um ▁in ▁close ▁proxim ity ▁to ▁the ▁int est inal ▁ep ith el ium ▁where ▁they ▁are ▁thought ▁to ▁help ▁indu ce ▁T ▁helper ▁ 1 7 ▁cell ▁responses . ▁ ▁In tr igu ingly , ▁Seg ment