The word "cryptoptile" is spelled with a pronounced "krip-toh-tyl" sound. This word is composed of two roots: "crypto" meaning hidden or secret, and "ptile" meaning a feather. The phonetic transcription of "krip" is /krɪp/ while "toh" is /toʊ/ and "tyl" is /tɪl/--this is the sequence of sounds that create the word as a whole. Cryptoptile is a scientific term used to describe the feather structure of ancient birds that were larger than the ostrich.
There is no readily available information on the etymology of the word "cryptoptile". It's possible that the word is either a neologism or a highly specialized term with limited usage and therefore lacks a well-documented etymology.