IPA: /ˌpeɪliəʊˈzuːələdʒɪst/
KK: /ˌpeɪliəʊˈzoolədʒɪst/
A scientist who studies the remains of animals from past geological periods.
The paleozoologist discovered fossils that provided insight into ancient ecosystems.
Paleozoologist → It is formed from "paleo-" (from Greek "palaios", meaning ancient) and "zoologist" (from Greek "zōon", meaning animal, and "logia", meaning study). A paleozoologist is someone who studies ancient animals.
Think of 'ancient' ('paleo-') animals ('zōon') being studied ('logia') — that's what a paleozoologist does.