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Hagfish, of the class Myxini / m ɪ k ˈ s aɪ n aɪ / (also known as Hyperotreti) and order Myxiniformes / m ɪ k ˈ s ɪ n ɪ f ɔːr m iː z /, are eel-shaped jawless fish (occasionally called slime eels). Hagfish are the only known living animals that have a skull but no vertebral column, although they do have rudimentary vertebrae. [3]
Southern hagfish (Myxine australis) mid-19th century drawing by Günther. Myxine / m ɪ k ˈ s aɪ n iː / is a genus of hagfish, from the Greek μυξῖνος (myxinos, "slimy").It is the type genus of the class Myxini.
A craniate is a member of the Craniata (sometimes called the Craniota), a proposed clade of chordate animals with a skull of hard bone or cartilage.Living representatives are the Myxini (hagfishes), Hyperoartia (including lampreys), and the much more numerous Gnathostomata (jawed vertebrates).
Myxine glutinosa, also known as the Atlantic hagfish, is a type of jawless fish belonging to the class Myxini. . Description The ... For example, the experiment ...
Cyclostomi, often referred to as Cyclostomata / s ɪ k l oʊ ˈ s t ɒ m ə t ə /, is a group of vertebrates that comprises the living jawless fishes: the lampreys and hagfishes.Both groups have jawless mouths with horny epidermal structures that function as teeth called ceratodontes, and branchial arches that are internally positioned instead of external as in the related jawed fishes. [1]
The white-headed hagfish may grow up to 57 centimetres (1.87 ft) long. [5] It is a seven-gilled hagfish; it can be distinguished from related species by its large number of tooth cusps: between 44 and 51. [9]
It is a harmless scaleless, eel-like animal with a pinkish body, a whitish head and a whitish mid dorsal stripe. The size of captured specimens ranges between 91 and 394 mm.
There are 107 classes of animals in 33 phyla in this list. However, different sources give different numbers of classes and phyla. For example, Protura, Diplura, and Collembola are often considered to be the three orders in the class Entognatha. This list should by no means be considered complete and authoritative and should be used carefully.