platypodes

Usage notes
The plural form platypodes is formed by application of the Greek (the language from which platypus derives) rules of forming plurals, precedented by the similarly formed plurals podes and octopodes (plurals of pous and octopus, respectively). However, being a fairly novel plural form, it is seldom used; the plurals platypuses, platypus, or, more rarely, platypi are more common. The plural form platypi is used sometimes under the impression that platypus is a masculine Latin second declension noun.