Art: Julio Lacerda
Wenupteryx is pronounced wen-up-TER-iks.
/ˌwɛn.əpˈtɛr.ɪks/
Capitals mark the stressed syllable.
The audio is a synthesized voice reading the name, so it can differ slightly from the respelling.
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Where the name comes from
ptero-
/ˈtɛr.oʊ/
Greek, “pteron, wing”
IPA from Wiktionary