What is "marplesornis"

Marplesornis novaezealandiae, also referred to as Harris' penguin is a genus and species of extinct penguin from New Zealand. It was a relatively large penguin, about the same size as a king penguin. The age of the only known specimen is uncertain, being often mentioned as Late Pliocene in age. However, due to the complex geology of the collection site, its actual age is somewhere between Early Miocene and Late Pliocene.