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RE: Two-headed choristodere fossil

The two-headed choristodere is a specimen of _Hyphalosaurus lingyuanensis_,
and was preserved "found in a nest surrounded by dozens of other reptile
fossils."  See
ml which includes a restoration, and
423756&in_page_id=1766&ito=1490 which includes reader's comments. 

Dino Guy Ralph
Docent at the California Academy of Sciences
Dinosaur and Fossil Education
Member of the Society of Vertebrate Paleontology