A type of extinct fish with a specialized two-part skull structure characteristic of certain ancient bony fish.
From di- (two) + Greek sphen- (wedge) + Greek ichthys (fish). This is a paleontological term describing structural features of prehistoric fish fossils.
These ancient creatures had unique skull arrangements that paleontologists use to trace the evolutionary history of vertebrate head structures—it's like reading a biological blueprint from hundreds of millions of years ago!
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