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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) o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perleidus Altolepis
''Perleidus'' is an extinct genus of Actinopterygii, ray-finned fish from the Triassic period (geology), 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 Palaeonisciformes, palaeonisciform fish, from which it may have been descended. Unlike those earlier fish, however, ''Perleidus'' and its relatives had highly flexible dorsal fin, 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 species, type) and ''P. sinensis''. The type species was originally described as ''Semionotus altolepis'' by Wilhelm Deecke. The genus ''Perleidus'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teffichthys
''Teffichthys'' is an extinct genus of ray-finned fish from the Early Triassic epoch. Fossils have been found in Madagascar and China, and possibly also in Angola, Canada, Greenland, and Svalbard. Classification The type species of ''Teffichthys'' is ''Perleidus madagascariensis'' from the Induan of Madagascar. ''Perleidus'' is a Middle Triassic genus; Early Triassic species were referred to this genus based on superficial similarities. In 2017, the genus ''Teffichthys'' was erected for "''Perleidus''" ''madagascariensis'', and the second species from Madagascar ("''Perleidus''" ''piveteaui'') was synonymized with ''Teffichthys madagascariensis''. Other Early Triassic species currently ascribed to ''Perleidus'' might be referrable to ''Teffichthys'', too. Another species, ''T. elegans'', was described from the Early Triassic Guiyang biota of South China. A phylogenetic analysis placed ''Teffichthys'' as a stem-neopterygian Neopterygii (from Greek νέος ''neos'' 'new' a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perleidiformes
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 *Genus † ''Saurichthyes'' ** 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perleididae
Perleidiformes are an extinct order of prehistoric ray-finned fish from the Triassic 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 *Genus † '' Saurichthyes'' ** Family † Cleithrolepididae Wade 1935 corrig. leithrolepidae 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 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants of an ancestral taxon are grouped together (i.e. Phylogeneti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perledo
Perledo ( Comasco, Lecchese: ) is a ''comune'' (municipality) in the Province of Lecco in the Italian region Lombardy, located about north of Milan and about northwest of Lecco Lecco (, , ; ) is a city of approximately 47,000 inhabitants in Lombardy, Northern Italy, north of Milan. It lies at the end of the south-eastern branch of Lake Como (the branch is named ''Branch of Lecco'' / ''Ramo di Lecco''). The Bergamasqu .... As of 31 December 2004, it had a population of 900 and an area of .All demographics and other statistics: Italian statistical institute Istat. Perledo borders the following municipalities: Bellano, Esino Lario, Menaggio, Parlasco, San Siro, Varenna. Perledo includes the following "frazione" or hamlets: Tondello, Olivedo, Vezio, Regolo, Bologna, Gisazio, Regoledo, Cestaglia, Gittana, Riva di Gittana, Portone, Panighetto. Pereldo lies on the east shore of Lake Como, across the lake from the municipality of Menaggio. Churches * Church of San Mar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triassic Fish Of Asia
The Triassic ( ; sometimes symbolized 🝈) is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.4 Mya. The Triassic is the first and shortest period of the Mesozoic Era and the seventh period of the Phanerozoic Eon. Both the start and end of the period are marked by major extinction events. The Triassic Period is subdivided into three epochs: Early Triassic, Middle Triassic and Late Triassic. The Triassic began in the wake of the Permian–Triassic extinction event, which left the Earth's biosphere impoverished; it was well into the middle of the Triassic before life recovered its former diversity. Three categories of organisms can be distinguished in the Triassic record: survivors from the extinction event, new groups that flourished briefly, and other new groups that went on to dominate the Mesozoic Era. Reptiles, especially archosaurs, were the chief terr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Ray-finned Fish Genera
Prehistory, also called pre-literary history, is the period of human history between the first known use of stone tools by hominins million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared years ago. It took thousands of years for writing systems to be widely adopted, with writing having spread to almost all cultures by the 19th century. The end of prehistory therefore came at different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. It is based on an old conception of history that without written records there could be no history. The most common conception today is that history is based on evidence, however the concept of prehistory hasn't been completely discarded. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Neopterygii
Prehistory, also called pre-literary history, is the period of human history between the first known use of stone tools by hominins million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared years ago. It took thousands of years for writing systems to be widely adopted, with writing having spread to almost all cultures by the 19th century. The end of prehistory therefore came at different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. It is based on an old conception of history that without written records there could be no history. The most common conception today is that history is based on evidence, however the concept of prehistory hasn't been completely discarded. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civilis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Order (biology)
Order () is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between family and class. In biological classification, the order is a taxonomic rank used in the classification of organisms and recognized by the nomenclature codes. An immediately higher rank, superorder, is sometimes added directly above order, with suborder directly beneath order. An order can also be defined as a group of related families. What does and does not belong to each order is determined by a taxonomist, as is whether a particular order should be recognized at all. Often there is no exact agreement, with different taxonomists each taking a different position. There are no hard rules that a taxonomist needs to follow in describing or recognizing an order. Some taxa are accepted almost universally, while others are recognized only rarely. The name of an order is usually written with a capital letter. For some groups of organisms, their orders may follow consist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family (biology)
Family (, : ) is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as the "walnut family". The delineation of what constitutes a family—or whether a described family should be acknowledged—is established and decided upon by active taxonomists. There are not strict regulations for outlining or acknowledging a family, yet in the realm of plants, these classifications often rely on both the vegetative and reproductive characteristics of plant species. Taxonomists frequently hold varying perspectives on these descriptions, leading to a lack of widespread consensus within the scientific community ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
