The American Museum of Natural History touts a dinosaur whose “scale caused it no end of problems”

Scientists believe these parts belong to one animal… They have named it Elongatomous… [New York: American Museum of Natural History], no date, but likely last quarter 20th century.
Poster printed in black and red, 46”h x 60”w at sheet edge. Small chip to lower edge, else excellent.

A fantastically whimsical imaginary map featuring the continent-spanning Elongatomous, issued to promote the dinosaur fossil exhibits at the American Museum of Natural History in New York City.

The Elongatomous, apparently, was a two-headed, continent-spanning lizard, whose “scale caused it no end of problems. When the head was attacked in Florida, three weeks passed before a reaction came from the legs (attending a convention in Mercer, Ohio).”

Not in OCLC, and a variety of Google searches yield no information or other examples.