[2] Until 2017, no specimen of this snake had been seen alive since 1953 and only five dead specimens had been collected since then, but in late January 2017, an adult female Cropan's tree boa measuring 1.7 m (5.6 ft) was captured by locals in Ribeira who brought it to herpetologists from the Instituto Butantan and the Museum of Zoology of the University of São Paulo, who radio-tagged and released the animal to learn more about the species' behavior.

[5] The specific name, cropanii, is in honor of Italian geologist Ottorino de Fiore, Baron of Cropani.

[8] It has been confirmed recently from the specimen found in Ribeira (and radio-tagged) that Cropan's tree boa is often arboreal.

[9] C. cropanii is found only on or near the coastal plain at 40–45 m (131–148 ft) elevation in the municipalities of Miracatu, Pedro de Toledo, and Santos, in São Paulo, Brazil.

The type locality given is "Miracatu, State of São Paulo, Brazil".