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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: [1]
3.2.4.1 Class Actinopterygii: Ray-finned fish. 3.2.4.2 Class ... This article contains a list of all of the classes and orders that are located in the Phylum Chordata.
In his landmark publications, such as the Systema Naturae, Carl Linnaeus used a ranking scale limited to kingdom, class, order, genus, species, and one rank below species. Today, the nomenclature is regulated by the nomenclature codes. There are seven main taxonomic ranks: kingdom, phylum or division, class, order, family, genus, and species.
Class Cephalaspidomorphi - lampreys; Superclass Gnathostomata Vertebrates with jaws Class Chondrichthyes (cartilagineous fish - sharks and rays) Class Osteichthyes (bony fish), which has two subclasses: Actinopterygii (ray-finned fish) Sarcopterygii (lobe-finned fish) Full details of higher order fish taxonomy can be found in the Chordata article.
The following is a list of the classes in each phylum of the kingdom Animalia. 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 ...
As generally benthic fish, blenniiformids spend much of their time on or near the sea floor; many are reclusive and may burrow in sandy substrates or inhabit crevices in reefs, the lower stretches of rivers, or even empty mollusc shells. Some blennies, otherwise known as "rock-hoppers", leap from the water onto rocks in order to reach other pools.
Cyprinodontiformes / ˌ s ɪ p r ɪ n oʊ ˈ d ɒ n t ɪ f ɔːr m iː z / is an order of ray-finned fish, comprising mostly small, freshwater fish. [1] Many popular aquarium fish, such as killifish and live-bearers, are included. They are closely related to the Atheriniformes and are occasionally included with them.
Triacanthus biaculeatus is classified within the genus Triacanthus, a name that prefixes acanthus, which means “thorn” or “spine”, with tri-, meaning “three”, this is an allusion to the long and robust first spine of the dorsal fin and the two large spines in the pelvic fins.
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