Acanthodii or acanthodians is an extinct class of gnathostomes (jawed fishes). They are currently considered to represent a paraphyletic grade of various fish lineages basal to extant …

Acanthodians are a group of fossil fish known from the Lower Silurian through their extinction in the Permian. Some classify acanthodians with the bony fish (Osteichthyes, described next) …

The acanthodians are a mysterious extinct group of fishes, which lived in the waters of the Palaeozoic era (541 million to 252 million years ago). They are characterized by a superficially …

spiny shark, any of a group of more than 150 species of small extinct fishes traditionally classified in the class Acanthodii and considered by many paleontologists as the earliest known jawed …

Acanthodes (from Greek: ἄκανθώδης akanthódis, 'provided with spines') [2] is an extinct genus of acanthodian fish. Species have been found in Europe, North America, and Asia, spanning the …

The fish is the only near complete acanthodian from pre-Devonian strata worldwide, and confirms that Nerepisacanthus has dentigerous jaw bones, body scales with superposed crown growth …

In Depth Parexus is a genus of acanthodian‭ (‬often dubbed spiny shark‭) ‬fish that lived in the waters of what is now Scotland during the early Devonian.‭ ‬Acanthodian fish are noted for their …

The Acanthodian fishes form one of the most sharply demarcated and recognizable groups of vertebrate fossils. Their characteristic squamation of square, exceedingly minute ganoid …

Ischnacanthus was an acanthodian with a long body covered in mosaic-like scales. They possess highly advanced, spindle-shaped bodies that were thought to have made them swift …

The Acanthodians are jaw-bearing fish that still are the subject of dispute over their systematic position because they have features of both bony fish ( Osteichthyes) and cartilaginous fish …