Agnatha - Wikipedia
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 ...
Jawless Fish - Characteristics And Examples - AnimalWised
2019年9月2日 · Although most agnatha are now extinct, some have found unique and interesting ways to survive. 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 …
agnathan - Encyclopedia Britannica
2024年9月20日 · 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.
Jawless Vertebrates - Digital Atlas of Ancient Life
The vast majority of jawless vertebrate diversity (mostly represented by ostracoderm fishes and conodonts) is now extinct, but one clade—the eel-shaped cyclostomes (hagfish and lampreys)—survive to the present day. Simplified overview of vertebrate phylogeny.
Jawless Fish - Fish & Fishing (U.S. National Park Service)
2017年5月8日 · Jawless fish are the most primitive fishes living today. Jawless fish: Lack jaws. Feed by suction with the help of a round muscular mouth and rows of teeth. Have cylindrical and long bodies. Do not have paired fins and scales like most fish. There are two categories of jawless fish: hagfish and lampreys. Hagfish.
Jawless Fish - Examples, Characteristics, Classification & Picture
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.
Cyclostomi - Wikipedia
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.
29.2A: Agnathans- Jawless Fishes - Biology LibreTexts
2023年10月31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.
Gnathostomata - Wikipedia
Gnathostomata (/ ˌnæθoʊˈstɒmətə /; from Ancient Greek: γνάθος (gnathos) 'jaw' + στόμα (stoma) 'mouth') are the jawed vertebrates. Gnathostome diversity comprises roughly 60,000 species, which accounts for 99% of all living vertebrates, including humans.
15.25: Jawless Fishes - Biology LibreTexts
2022年7月31日 · Jawless fishes are craniates that represent an ancient vertebrate lineage that arose over one half-billion years ago. In the past, the hagfishes and lampreys were classified together as agnathans. Today, hagfishes and lampreys are recognized as separate clades, primarily because lampreys are true vertebrates, whereas hagfishes are not.