basis of record
van der Land, J. (ed). (2008). UNESCO-IOC Register of Marine Organisms (URMO). , available online at http://www.marinespecies.org/urmo/ [details]
source of synonymy
Sawyer, R.T. (1986). Leech biology and behaviour. Vol. II. Feeding biology, ecology, and systematics. Clarendon Press. 375 p. [details]
From editor or global species database
Taxonomic remark Abranchus (Johansson, 1896) synonym in part (preoccupied) to Malmiana (Strand, 1942) as well as Oceanobdella (Caballero, 1956) [details]