Anniealexandria is an extinct
genus of
amphisbaenian lizard known by the
type species Anniealexandria gansi from the earliest
Eocene of Wyoming.
Anniealexandria is the only known member of the family
Bipedidae in the fossil record, which otherwise only includes the extant genus
Bipes from Mexico. It was named in 2009 in honor of
Annie Montague Alexander, founder of the
University of California Museum of Paleontology. Remains of
Anniealexandria are known only from a single fossil locality in the
Bighorn Basin called Castle Gardens, but within the locality its fossils are common in the
Willwood Formation, usually consisting of isolated jaw bones and vertebrae.
Anniealexandria seems to have been a common component of a paleofauna that included fifteen other lizard species and existed in western North America during a period of global warming in the latest
Paleocene and earliest Eocene.