Luopterus is pronounced loo-OP-ter-us.
/luːˈɒp.tər.əs/
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