You didn't make a mistake Steve. Here's a few quick examples that make note of reptiles in the definition:

ecdysis - definition of ecdysis by the Free Online Dictionary, Thesaurus and Encyclopedia.

Ecdysis | Define Ecdysis at Dictionary.com

ecdysis definition - Dictionary - MSN Encarta

http://www.ncbi.nlm.nih.gov/pmc/arti...00053-0113.pdf

http://biology.uta.edu/clcox/Cox%20e...r%20object.pdf