Agnatha (/ ˈæɡnəθə, æɡˈneɪθə /; [3] from Ancient Greek ἀ- (a-) 'without' and γνάθος (gnáthos) 'jaws') or jawless fish is a paraphyletic infraphylum [4] of animals in the subphylum Vertebrata …

agnathan, (superclass Agnatha), any member of the group of primitive jawless fishes that includes the lampreys (order Petromyzoniformes), hagfishes (order Myxiniformes), and several extinct …

2025年3月22日 · The term “Agnatha” is derived from Greek, where “a” means without, and “gnathos” means jaw. This Superclass of Vertebrae lacks a true jaw and paired fins, …

2019年9月2日 · Agnatha species, or jawless fish, are said to be the earliest vertebrates ever recorded, that are believed to be present during the Paleozoic era. In fact, the evolution of …

2024年4月12日 · The Agnatha, meaning “without jaws,” is a superclass of jawless fish within the phylum Chordata and subphylum Vertebrata. It encompasses both living species, known as …

2022年12月27日 · What is an agnatha? The term agnatha encompasses a biological group that brings together vertebrates that don’t have jaws. Its name comes from the Greek agnatha, “a” …

Agnathan - Evolution, Classification, Jawless: Superclass Agnatha have fossils dating from the Ordovician Period, and are distinguishable from the other craniates by their lack of jaws. Living …

2024年11月23日 · Jawless fishes or agnathans are craniates that represent an ancient vertebrate lineage that arose over one half-billion years ago. “Gnathos” is Greek for “jaw” and the prefix …

Agnatha (Greek, "no jaws"), often considered a superclass within the subphylum Vertebrata, comprises the jawless fish—the oldest known vertebrates. The two extant groups of jawless …

The Agnatha, more commonly referred to as the jawless fishes, represents one of the oldest surviving lineages of vertebrates and has recently been discovered to possess cellular …