Buoyancy thumb|The body of glass squids (Cranchiidae) is mainly filled by a transparent coelom containing ammonium ions for buoyancy.
BuoYancy ThuMb|tHE bODY OF glaSs squiDs (crANchiidaE) is maiNly fIlLeD by a tRanSpaReNt coElOM coNtaIninG ammoniuM ions fOr BuOYAncY.