n ows ▁are ▁members ▁of ▁the ▁family ▁Um br idae , ▁and ▁the ▁name ▁g ud geon ▁is ▁used ▁for ▁various ▁bottom - d well ing ▁species ▁of ▁cy pr in id , ▁ele ot rid , ▁and ▁p ter ele ot rid ▁fish es , ▁none ▁of ▁which ▁belongs ▁to ▁the ▁same ▁family ▁as ▁the ▁fund ul id ▁m umm ich og . ▁ ▁Description ▁ ▁The ▁body ▁of ▁the ▁m umm ich og ▁is ▁el ong ate ▁but ▁thick , ▁with ▁a ▁deep ▁ca ud al ▁ped un cle . ▁Us ual ▁length ▁is ▁ ▁but ▁a ▁maximum ▁length ▁of ▁up ▁to ▁ ▁is ▁possible . ▁The ▁mouth ▁is ▁u pt urn ed ▁and ▁the ▁lower ▁j aw ▁pro tr udes ▁when ▁the ▁mouth ▁is ▁closed . ▁P ector al ▁and ▁tail ▁fins ▁are ▁round . ▁M umm ich ogs ▁have ▁ 1 0 - 1 3 ▁d ors al ▁fin ▁ray s , ▁ 9 - 1 2 ▁anal ▁fin ▁ray s , ▁ 1 6 - 2 0 ▁p ector al ▁fin ▁ray s . ▁M ales ▁have ▁larger ▁d ors al ▁and ▁anal ▁fins ▁than ▁females . ▁There ▁is ▁no ▁later al ▁line ▁on ▁the ▁body , ▁but ▁later al ▁line ▁por es ▁are ▁present ▁on ▁the ▁head . ▁The ▁colour ▁is ▁variable ▁( and ▁may ▁even ▁change ▁in ▁sh ade ▁within ▁the ▁same ▁individual ▁when ▁placed ▁near ▁different ▁background s ) ▁but ▁is ▁generally ▁o live - b rown ▁or ▁o live - green . ▁There ▁can