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. 2017 Mar 21;5:e3103. doi: 10.7717/peerj.3103

Figure 4. Examples of tetrapods with or without patellae.

Figure 4

Red arrows denote the patella. (A, B) Ornithorhynchus anatinus (Monotremata: duck-billed platypus, Redpath Museum specimen 2458). (C, D) Tachyglossus aculeatus (Monotremata: echidna, Redpath Museum specimen 2463). (E, F) D. virginiana (Metatheria: North American opossum, Redpath Museum specimen 5019). (G, H) Procavia capensis (Eutheria: Afrotheria: Cape hyrax, uncatalogued Horniman Museum Specimen, London, UK). (I) knee of patient with Meier–Gorlin Syndrome (Guernsey et al., 2010). For more images of mammalian patellae (or lack thereof in some marsupials), see Figs. S1–S3.