Definition of "alligatorid"

This species is large compared with known Eocene alligatorids, although its character states present a mosaic of resemblances to earlier and later alligatorids.

1956, Acta Zoologica Cracoviensia, volume 31, page 554

Although most alligatorids have ventral osteoderms, the American alligator usually has only poorly developed single osteoderms in the pectoral and midventral regions, if at all (Fig. 6C and D).

1989, International Union for Conservation of Nature and Natural Resources, Crocodiles: Their Ecology, Management, and Conservation‎, page 24

The oldest alligatorid, Navajosuchus mooki, is from the lowermost Paleocene (66-62 Ma).

2009, S. Blair Hedges, Sudhir Kumar, The timetree of life‎, page 403