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The frilled shark (Chlamydoselachus anguineus) is a rare deep-sea fish belonging to a remarkably ancient lineage of sharks. Its unique appearance—characterized by an eel-like body and distinctive frilled gill slits—makes it one of the most primitive extant shark species. Scientists study this animal...
Haikouichthys ercaicunensis is a small, fishlike chordate from the Early Cambrian Chengjiang biota of Yunnan, China, dating to roughly 518 million years ago. Fossils show a distinct head region, repeated muscle blocks, gill structures, and fin folds, features associated with early vertebrate organiz...
Xenacanthus is a freshwater xenacanth fish from the Carboniferous and Permian, notable for an eel-like body and spine behind the head.
Early Triassic ichthyosaur from Japan described in 1982, one of the most primitive members of its lineage, preserving features key to tracing the group's land-to-sea evolutionary transition.
