A subgroup of crocodilians (crocodiles and alligators) that includes all the modern living forms, distinguished by certain skull and tooth characteristics.
From Greek 'eu-' (true, good) + 'suchos' (crocodile). The prefix 'true' emphasizes these are the 'proper' or modern crocodilians.
Eusuchians have ruled water ecosystems for millions of years with minimal change—they're nature's living fossils that hit an evolutionary jackpot and stuck with the winning design.
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