of the Cephalaspidomorphi. ^ Petromyzoniformes and Petromyzonidae are sometimes used as alternative spellings for Petromyzontiformes and Petromyzontidae respectively. ^ " A Surfeit of Lampreys ". Time . 1955-05-09 . http://www.time.com/time/magazine/article/0,9171,861450,00.html . Retrieved on 2008-06-07.  ^ Giant reticulospinal synapse in lamprey: molecular links between active and periactive zones., Brodin L. et al.,