Placoderms (from Ancient Greek πλάξ (plax, plakos) 'plate' and δέρμα (derma) 'skin') [1] are vertebrate animals of the class Placodermi, an extinct group of prehistoric fish known from …

placoderm, any member of an extinct group (Placodermi) of primitive jawed fishes known only from fossil remains. Placoderms existed throughout the Devonian Period (about 416 million to …

The placoderms (class Placodermi) are armored prehistoric fishes known from fossils dating from the late Silurian to the end of the Devonian period. Placoderms were among the first of the …

2024年1月22日 · Placoderms were the dominant vertebrates on Earth for almost 80 million years, becoming extinct at the end of the Devonian. The figure shows hallmarks of the external and …

The placoderms (Placodermi: Greek = plated skin) were a class of armoured prehistoric fish, which lived from the mid Silurian to the end of the Devonian period. Their head and thorax …

2024年1月22日 · For over 70 million years, during the Paleozoic, the placoderms (Greek for ‘plated skin’), an extinct group of armoured fishes, were the most abundant and diverse …

Placoderms evolved into a variety of ecomorphs (body types), including torpedo-shaped swimmers, flattened bottom-dwellers, and armoured box-like types. They included both …

Placodermi were the earliest jawed vertebrates of fossil record. They appeared in Silurian, flourished in Devonian and Carboniferous and became extinct in Permian. They probably lived …

Placoderms were the dominant fish of marine and freshwater environments during the Devonian Period but became extinct at the end of the Devonian. For sixty million years they had become …

2010年4月30日 · Placoderms, the most diverse group of Devonian fishes, were globally distributed in all habitable freshwater and marine environments, like teleost fishes in the …