Laopteryx is pronounced LOWP-ter-iks.
/ˈlaʊp.tər.ɪks/
Capitals mark the stressed syllable.
The audio is a synthesized voice reading the respelling.
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Where the name comes from
ptero-
/ˈtɛr.oʊ/
Greek, “pteron, wing”
IPA from Wiktionary
What the name means
The generic name is derived from Greek laas, "stone", and pteryx, "wing".