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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]
The torrentfish (Cheimarrichthys fosteri), or panoko , is an amphidromous freshwater ray-finned fish that is endemic to New Zealand. [2] Torrentfish are well adapted to life in shallow, fast-flowing riffles and rapids .
Catalog of Fishes is a comprehensive on-line database and reference work on the scientific names of fish species and genera. It is global in its scope and is hosted by the California Academy of Sciences. It has been compiled and is continuously updated by the curator emeritus of the CAS fish collection, William N. Eschmeyer.
The sauger (Sander canadensis) is a freshwater perciform fish of the family Percidae that resembles its close relative, the walleye. The species is a member of the largest vertebrate order, the Perciformes. [3] It is the most migratory percid species in North America. [4]
The phylogenetic classification of bony fishes is a phylogenetic classification of bony fishes and is based on phylogenies inferred using molecular and genomic data for nearly 2000 fishes. [ 1 ] [ 2 ] [ 3 ] The first version was published in 2013 and resolved 66 orders. [ 2 ]
The sucker has a small black skull and two air-bladders, although the air-bladders are reduced in size. The fish is small in size, and generally does not exceed seven inches. The fish exhibits sexual dimorphism, and its appearance varies depending on gender. [3] The male sucker has a narrow red lateral band on it and a long dorsal and ventral fin.
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.
Psilorhynchus is a genus of ray-finned fish in the family Psilorhynchidae native to South Asia.This genus is the only member of its family.The members of Psilorhynchus are small benthic fishes which occur in rivers and streams with fast to swift currents, hence they are often referred to as torrent minnows.