Citations:platypus

Singular platypus
 * 1779, George Shaw, The Naturalist's Miscellany: Or, Coloured Figures Of Natural Objects; Drawn and Described Immediately From Nature
 * The Platypus is a native of Australia or New Holland, and is at present in the possession of Mr. Dobson, so much distinguished by his exquisite manner of preparing specimens of vegetable anatomy.

Plural form platypuses
 * 1958, Richard H. Manville, Concerning Platypuses, in Journal of Mammology, Vol. 39, No. 4
 * For the past ten years the only living duck-billed platypuses, Ornithorhynchus anatinus, outside their native Australia and Tasmania were the two in the collection of the New York Zoological Society.

Plural form platypi
 * 1832, On the Mammary Glands of the Ornithorhynchus paradoxus, in Philosophical Transactions of the Royal Society of London, Vol. 122
 * In the insides of several female Platypi which were shot, eggs were found of the size of a large musket-ball and downwards, imperfectly formed however, i. e. without the hard outer shell, which prevented their preservation. Several young Platypi were obtained and put into spirits, in which state they are forwarded.

Plural form platypie

Plural form platypies

Plural form platypus
 * 1998, Paul R. Manger, Leslie S. Hall & John D. Pettigrew, The Development of the External Features of the Platypus (Ornithorhynchus Anatinus), in Philosophical Transactions: Biological Sciences, Vol. 353, No. 1372
 * In this study, the examination of 33 nestling platypus was undertaken, which represents the largest collection of nestling platypus examined in any single study. The ages of these platypus ranged from the day of hatching through to approximately 6 months of age.

Plural form platypodes
 * 2001: Peter Mackay, Native Animal Recipes? in canb.general
 * Anyway, kangaroos evolved here, as did platypodes and a whole bunch of other birds and animals and fish and plants. Murray Cod. Emu. Macadamias.