The spelling of the word "pteleos" can be explained using the International Phonetic Alphabet (IPA). The "p" sound is represented with the IPA symbol /p/, while the "t" sound is represented with /t/. The "e" sound is represented with /ɛ/, and the following "l" sound with /l/. The second "e" sound is represented with /i/, and the "o" sound with /oʊ/. Finally, the "s" sound is represented with /s/. Therefore, the correct IPA transcription of "pteleos" would be /ptɛlios/.