The story
From eagle + shark, referencing this animal's winglike fins.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Aquilolamna milarcae, an extinct shark that inhabited the Late Cretaceous (Turonian)-aged Agua Nueva Formation of Mexico; it has a torpedo-shaped body, a broad head, and long, winglike pectoral fins. Full definition →
From eagle + shark, referencing this animal's winglike fins.
Etymology from Wiktionary, CC BY-SA 4.0.