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

2019年9月2日 · Agnatha or jawless fish can be found in waters all over the world, and they share few characteristics with other marine mammals. But, what is a jawless fish? Keep reading here to find out! In this AnimalWised article we’ll be discussing the most common characteristics and examples of agnatha, images included.

Agnatha (/ ˈ æ ɡ n ə θ ə, æ ɡ ˈ n eɪ θ ə /; [3] from Ancient Greek ἀ-(a-) 'without' and γνάθος (gnáthos) 'jaws') is a paraphyletic infraphylum [4] of non-gnathostome vertebrates, or jawless fish, in the phylum Chordata, subphylum Vertebrata, consisting of both living (cyclostomes) and extinct (conodonts, anaspids, and ...

2024年7月9日 · Jawless fish, belonging to the infraphylum Agnatha, are unique among vertebrates due to their lack of jaws. They possess long, cylindrical bodies devoid of paired fins and scales and feature seven or more paired gill pouches.

2025年1月23日 · In this article on our site we introduce you to the agnate or jawless fish, we talk about their characteristics with examples and images. Find out what they are!

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 “a” means “without,” so agnathans are “without jaws. ” Most agnathans are now extinct, but two branches still exist today: hagfishes and lampreys.

2022年12月27日 · Agnatha are a group of jawless fish with few living species. Get to know these animals with us before they leave Earth altogether.

2024年9月5日 · Cyclostomata are group of parasitic vertebrates that includes the living jawless fish, morphologically similar to eels. They are popularly known as Agnatha, due to their jawless mouth. They belong to phylum chordata of kingdom Animalia. Cyclostomes are believed to have split off before the evolution of dentine and bone, hence making them jawless.

Agnatha ('without jaws') is a jawless fish superclass in the phylum Chordata, subphylum Vertebrata, that includes both living (cyclostomes) and extinct (conodonts and ostracoderms) species. The group is related to all vertebrates with jaws, which are referred to as gnathostomes.

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 cyclostomes, and extinct species like conodonts and ostracoderms.