Assertion: cormorant's family | /r/HasProperty | gaviellidae
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text: A piece of a carpometacarpus supposedly from Oligocene rocks near Lusk, Wyoming, was described as Gaviella pusilla, but this handbone also shows some similarities to the plotopterids, flightless wing-propelled diving birds, and if these are apomorphic would make an unconvincing member of the Gaviidae (though it still could be a small-winged gaviiform in a yet-undescribed family "Gaviellidae"): while the carpometacarpus in Gavia is somewhat convergent to that of wing-propelled diving birds, enabling the wings to be used as rudders for quick underwater turns, Colymboides still had an unspecialized plesiomorphic hand.