What is an example of an Agnatha fish?
Pteraspidomorphi
Haikouichthys
Jawless fish/Lower classifications
What animals are in the class Agnatha?
Agnatha are jawless fish. Lampreys and hagfish are in this class. Members of the agnatha class are probably the earliest vertebrates. Scientists have found fossils of agnathan species from the late Cambrian Period that occurred 500 million years ago.
What are two Agnatha examples?
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.
How many species of jawless fish are there?
Most scientists agree that the jawless fish are part of the the superclass Agnatha. They belong to the phylum Chordata, subphylum Vertebrata. There are two living groups of jawless fish, with about 100 species in total: lampreys and hagfish (Figure below).
What are 3 examples of jawless fish?
Summary
- The jawless fish include the lampreys and the hagfish.
- Jaws, fins, and stomachs are absent in the jawless fish.
- Features of the jawless fish include a notochord, paired gill pouches, a pineal eye, and a two-chambered heart.
Are sharks jawless fish?
Hagfishes and lampreys are the only living kinds of jawless fishes. The second type of fish is the cartilaginous fishes. These include sharks, rays, and skates. Their skeletons are made of cartilage, just like the skeletons of the jawless fishes.
Are there any living species of the Agnatha?
There are two living groups of Agnatha – the Lampreys (class Hyperoartii) and the Hagfish (class Myxini) Key Features of Agnatha. Jaws are absent. Paired fins are generally absent. Early species had heavy bony scales and plates in their skin, but these are not present in living species.
How many classes of fish are there in the subphylum Vertebrata?
The Subphylum Vertebrata contains two Superclasses, Agnatha and Gnathostomata: Superclass Agnatha contains only two Classes of animals, both of which come under the general term of fish. Superclass Gnathostomata contains six Classes of animals, two of which are also included in the general term of fish. Higher Classification of the Phylum Chordata
What kind of animal is the Agnatha lamprey?
There are two living groups of Agnatha – the Lampreys (class Hyperoartii) and the Hagfish (class Myxini) Key Features of Agnatha. Jaws are absent. Paired fins are generally absent.
What kind of appendages does an agnathan have?
Appendages. Almost all agnathans, including all extant agnathans, have no paired appendages, although most do have a dorsal or a caudal fin. Some fossil agnathans, such as osteostracans and pituriaspids, did have paired fins, a trait inherited in their jawed descendants.