Perleididae

picture info	Perleididae Perleidiformes are an extinct order (biology), order of prehistoric ray-finned fish from the Triassic period (geology), period Although numerous Triassic taxa have been referred to Perleidiformes, which ones should be included for it to form a monophyletic group is a matter of ongoing scientific debate. Classification Family †Cleithrolepididae Wade 1935 corrig. [Cleithrolepidae Wade 1935; Hydropessidae Hutchinson 1973] * Genus †''Hydropessum'' Broom 1909 * Genus †''Cleithrolepidina'' Berg 1955 * Genus †''Cleithrolepis'' Egerton 1864 * Genus †''Dipteronotus'' Egerton 1864 Suborder †Cephaloxenoidei Lehman 1966 * Family †Cephaloxenidae Brough 1939 Genus †''Cephaloxenus'' Brough 1939 Suborder †Perleidoidei * Family †Platysiagidae Brough 1939 sensu Neuman & Mutter 2005 Genus †''Caelatichthys'' Lombardo 2002 Genus †''Helmolepis'' Stensiö 1932 Genus †''Platysiagum'' Egerton 1872 * Family †Polzbergiidae Griffin 1977 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Perleididae Perleidiformes are an extinct order (biology), order of prehistoric ray-finned fish from the Triassic period (geology), period Although numerous Triassic taxa have been referred to Perleidiformes, which ones should be included for it to form a monophyletic group is a matter of ongoing scientific debate. Classification Family †Cleithrolepididae Wade 1935 corrig. [Cleithrolepidae Wade 1935; Hydropessidae Hutchinson 1973] * Genus †''Hydropessum'' Broom 1909 * Genus †''Cleithrolepidina'' Berg 1955 * Genus †''Cleithrolepis'' Egerton 1864 * Genus †''Dipteronotus'' Egerton 1864 Suborder †Cephaloxenoidei Lehman 1966 * Family †Cephaloxenidae Brough 1939 Genus †''Cephaloxenus'' Brough 1939 Suborder †Perleidoidei * Family †Platysiagidae Brough 1939 sensu Neuman & Mutter 2005 Genus †''Caelatichthys'' Lombardo 2002 Genus †''Helmolepis'' Stensiö 1932 Genus †''Platysiagum'' Egerton 1872 * Family †Polzbergiidae Griffin 1977 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Perleidus ''Perleidus'' is an extinct genus of ray-finned fish from the Triassic period. Fossils have been found in the Middle Triassic of Italy, Switzerland, and China. The inclusion of Early Triassic species in the genus ''Perleidus'' was questioned. Ecology ''Perleidus'' was a marine predatory fish, about in length. Its jaws hung vertically under the braincase, allowing them to open wide, a feature it shared with the earlier palaeonisciform fish, from which it may have been descended. Unlike those earlier fish, however, ''Perleidus'' and its relatives had highly flexible dorsal and anal fins, with a reduced number of fin rays. This would have made the fish more agile in the water. Classification The genus ''Perleidus'' currently comprises two species: ''P. altolepis'' (type) and ''P. sinensis''. The type species was originally described as ''Semionotus altolepis'' by Wilhelm Deecke. The genus ''Perleidus'' was later erected for this species, named after the comune (municipality ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Monophyletic In cladistics for a group of organisms, monophyly is the condition of being a clade—that is, a group of taxa composed only of a common ancestor (or more precisely an ancestral population) and all of its lineal descendants. Monophyletic groups are typically characterised by shared derived characteristics ( synapomorphies), which distinguish organisms in the clade from other organisms. An equivalent term is holophyly. The word "mono-phyly" means "one-tribe" in Greek. Monophyly is contrasted with paraphyly and polyphyly as shown in the second diagram. A ''paraphyletic group'' consists of all of the descendants of a common ancestor minus one or more monophyletic groups. A '' polyphyletic group'' is characterized by convergent features or habits of scientific interest (for example, night-active primates, fruit trees, aquatic insects). The features by which a polyphyletic group is differentiated from others are not inherited from a common ancestor. These definitions have tak ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Ctenognathichthys ''Ctenognathichthys'' is an extinct genus of prehistoric bony fish that lived during the early Ladinian stage of the Middle Triassic epoch. It was a small fish measuring long. See also * Prehistoric fish * List of prehistoric bony fish A ''list'' is any set of items in a row. List or lists may also refer to: People * List (surname) Organizations * List College Albert A. List College of Jewish Studies, known simply as List College, is the undergraduate school of the J ... References Middle Triassic fish Prehistoric neopterygii Triassic fish of Europe {{triassic-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Serrolepis ''Serrolepis'' is an extinct genus of prehistoric bony fish. It was a highly-specialized small stem-neopterygian with strong jaws and a short head. Body shape is variable and known material appears to fall within several size classes & two morphotypes. Fossils of ''Serrolepis'' are known from the Middle Triassic Erfurt Formation of Germany. See also * Prehistoric fish * List of prehistoric bony fish A ''list'' is any set of items in a row. List or lists may also refer to: People * List (surname) Organizations * List College Albert A. List College of Jewish Studies, known simply as List College, is the undergraduate school of the J ... References External links Bony fish in the online Sepkoski Database Prehistoric neopterygii Prehistoric bony fish genera {{paleo-bony-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Platysiagum ''Platysiagum'' is an extinct genus of prehistoric bony fish belonging to the family Platysiagidae. Fossils are known from the Middle Triassic of China and Italy and the Early Jurassic of England. See also * Prehistoric fish The evolution of fish began about 530 million years ago during the Cambrian explosion. It was during this time that the early chordates developed the skull and the vertebral column, leading to the first craniates and vertebrates. The first fis ... * List of prehistoric bony fish References Prehistoric neopterygii Prehistoric bony fish genera {{Triassic-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Helmolepis ''Helmolepis'' is an extinct genus of ray-finned fish that lived during the Early Triassic epoch in what is now Greenland, Madagascar and Canada (British Columbia). Species of ''Helmolepis'' are small (between and ). This genus is closely related with '' Platysiagum''. See also * List of prehistoric bony fish genera This list of prehistoric bony fish is an attempt to create a comprehensive listing of all genera from the fossil record that have ever been considered to be bony fish (class Osteichthyes), excluding purely vernacular terms. The list includes al ... References Further reading * * Prehistoric neopterygii Early Triassic fish Triassic fish of North America Prehistoric fish of Africa {{Triassic-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Cephaloxenus ''Cephaloxenus'' is an extinct genus of prehistoric bony fish that lived during the early Ladinian stage of the Middle Triassic epoch. See also * Prehistoric fish * List of prehistoric bony fish A ''list'' is any set of items in a row. List or lists may also refer to: People * List (surname) Organizations * List College Albert A. List College of Jewish Studies, known simply as List College, is the undergraduate school of the J ... References Middle Triassic fish Peltopleuriformes Triassic fish of Europe {{peltopleuriformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Dipteronotus ''Dipteronotus'' is an extinct genus of stem group, stem-neopterygian Actinopterygii, ray-finned fish that existed during the Triassic period (geology), period in what is now Europe. As a typical feature, it had several ridge scales in front of its dorsal fin that created a spine-like structure. See also * Prehistoric fish * List of prehistoric bony fish References External links Bony fish in the online Sepkoski Database Prehistoric ray-finned fish genera Triassic bony fish Prehistoric neopterygii Prehistoric fish of Africa Triassic fish of Europe {{Triassic-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]