Fish - Wikipedia
A fish (pl.: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits. Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as well as the extinct placoderms and ...
Fish Groups | Types, Information and Fish Facts - Animal Corner
There are 5 major groups of fish, however, each class of fish is separated into smaller taxa such as orders, families, genera and species. The major groups also contain various subgroups and suborders.
Fish - Classification, Jawless, Cartilaginous & Bony Fishes | Britannica
2024年11月21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.
Taxonomy of fish - Wikipedia
Fishes are a paraphyletic group and for this reason, the class Pisces seen in older reference works is no longer used in formal taxonomy. 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 ...
The 3 Basic But Distinct Fish Groups - ThoughtCo
2019年8月14日 · The following is an introduction to three basic fish groups: bony fishes, cartilaginous fish, and lampreys. Justin Lewis / Getty Images. Bony fishes are a group of aquatic vertebrates characterized by having a skeleton made of bone.
Fish | Definition, Species, Classification, & Facts | Britannica
2024年11月21日 · Fish, any of approximately 34,000 species of vertebrate animals (phylum Chordata) found in the fresh and salt waters of the world. Living species range from the primitive jawless lampreys and hagfishes through the cartilaginous sharks, skates, and rays to the abundant and diverse bony fishes.
Diversity of fish - Wikipedia
Fish species diversity is roughly divided equally between marine (oceanic) and freshwater ecosystems. Coral reefs in the Indo-Pacific constitute the centre of diversity for marine fishes, whereas continental freshwater fishes are most diverse in large river basins of tropical rainforests, especially the Amazon, Congo, and Mekong basins.
Fish: Different Types, Definitions, Photos, and More
2023年1月3日 · Instead, there are 3 main classes, groups, or types of fish: bony fish (Osteichthyes), jawless fish (Agnatha), and cartilaginous fish (Chondrichthyes). Fish are the most diverse group among vertebrates, with over 33,000 different types of fish species.
Fish Groups – Discover Fishes - Florida Museum
2020年7月14日 · Fish live in this world of water and are the most numerous of the vertebrates, or animals with backbones. There are three major groups of living fish. Superclass Agnatha. The first group is the Superclass Agnatha. This group is the most primitive of the three groups of fish. The fish belonging to this group have no jaws.
Fish – Definition, Examples, Characteristics - Science Notes and …
2024年5月21日 · Fish are aquatic vertebrates that typically have gills, fins, and a streamlined body. They inhabit diverse environments, from freshwater rivers and lakes to salty oceans and deep seas. Fish, like all vertebrates, possess a backbone or spinal column. This characteristic places them within the subphylum Vertebrata.