Traditional classification divides fish into three extant classes (Agnatha, Chondrichthyes, and Osteichthyes), and with extinct forms sometimes classified within those groups, sometimes as their own classes: [1] Fish account for more than half of vertebrate species.

2025年4月8日 · Fishes are typically divided into three groups: superclass Agnatha (jawless fishes), class Chondrichthyes (cartilaginous fishes), and superclass Osteichthyes (bony fishes). The latter two groups are included within the infraphylum Gnathostomata, a category containing all jawed vertebrates.

2020年3月29日 · There are about 28,100 species of fishes known to science. They are divided into 4 classes, 59 orders, 490 families and 4,300 or so genera. The classification system of fish is not stagnant and it will change when we have more knowledge, perhaps from DNA analyses.

FishTaxa is a peer-reviewed international journal to support free exchange of ideas and information in systematics, phylogeny and biogeography of fishes with a preference for large taxonomic works such as monographs, revisions and checklists.

Number of taxa from Orders to Species are given for what they are, a useful tool for information and database management. The design of some analyses (so-called Biodiversity analyses) that uses these numbers must be carefully assessed before …

Fish can be split into two major groups: cartilaginous fish (eg, sharks and stingrays) and bony fish. Bony fish commonly kept as pets or display animals usually belong to one of the two subcohorts of Ostariophysi or Neoteleostei.

2024年5月21日 · Fish Taxonomy. Fish are classified into three major groups: Agnatha (Jawless Fish): Includes hagfish and lampreys. Chondrichthyes (Cartilaginous Fish): Includes sharks, rays, and skates. Osteichthyes (Bony Fish): The largest group, including both ray-finned (Actinopterygii) and lobe-finned fish (Sarcopterygii). Detailed Taxonomy of Fish. Agnatha:

There are about 28,000 existing species of fish, and they are placed in five classes: hagfish, lampreys, cartilaginous fish, ray-finned bony fish, and lobe-finned bony fish. Review Assume that a new species of fish has been discovered deep in the ocean.

Taxonomic classes of fish. Modern fish (not extinct) Modern fish (those that are not extinct) are found within two superclasses of the phylum Chordata. The superclasses are Agnatha the jawless vertebrates, and Gnathostomata (vertebrates with jaws). Within these superclasses there are four classes and two subclasses:

A comprehensive resource for ray-finned fish (Actinopterygii) phylogenetics, the taxonomy of fishes, and fossils of extinct fishes.