Plural Form of Words Ending in -us - Platypus

The situation with the word platypus is similar to that of octopus; the word is etymologically Greek despite its Latinized ending, and so pluralizing it as if it were Latin (i.e. as platypi) is ill-considered. As with octopus, importing Greek morphology into English would have platypodes as the plural, but in practice this form is not well-attested. In scientific contexts biologists often use platypus as both the singular and plural form of the word, in the tradition of sheep or fish, but laypersons and scientists alike often use the simple English plural platypuses. There is no consensus on which of these two is correct, with different dictionaries making different recommendations.