 The same situation is in "Melanodrymia" within the family Melanodrymiidae.Bathyphytophilidae and Lepetellidae are also known to have enlarged oesophageal pouches, however, though not to the extent of "Chrysomallon".Both are known to house endosymbiotic bacteria, in the case of bathyphytophilids most likely also in the oesophageal glands but in the lepetellids the endosymbionts are spread in the haemocoel.