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Watsonulus Eugnathoides
''Watsonulus'' is an extinct genus of prehistoric ray-finned fish that lived during the Early Triassic epoch in what is now Madagascar. It may have also existed in what is now Himachal Pradesh, India, during the Induan age (Early Triassic).Romano et al. (2016): Marine Early Triassic Osteichthyes from Spiti, Indian Himalayas. Swiss Journal of Palaeontology 135: 275-294 https://doi.org/10.1007/s13358-015-0098-6 The type species, described by Jean Piveteau, is ''Watsonia eugnathoides''. Because "''Watsonia''" was preoccupied, the new genus name ''Watsonulus'' was later erected. Classification ''Watsonulus'' belongs to Parasemionotidae, a family of early neopterygians closely related with halecomorphs. Other members of Parasemionotidae include '' Albertonia'', ''Candelarialepis'', '' Icarealcyon'', '' Jacobulus'', '' Lehmanotus'', '' Parasemionotus'', '' Qingshania'', '' Stensioenotus'', '' Suius'', and '' Thomasinotus''. Similar to ''Albertonia'' (Early Triassic of Canada) and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Induan
The Induan is the first age of the Early Triassic epoch in the geologic timescale, or the lowest stage of the Lower Triassic series in chronostratigraphy. It spans the time between 251.902 Ma and Ma (million years ago). The Induan is sometimes divided into the Griesbachian and the Dienerian subages or substages. The Induan is preceded by the Changhsingian (latest Permian) and is followed by the Olenekian. The Induan is roughly coeval with the regional Feixianguanian Stage of China. Geology Stratigraphy The Triassic is the first period of the Mesozoic era. It is subdivided into the Lower, Middle, and Upper Triassic series, which are further subdivided into stages. The Induan is the first stage of the Lower Triassic, from 251.9 million to 251.2 million years ago, spanning the first 700,000 years after the Permian–Triassic extinction event. Stages can be defined globally or regionally. For global stratigraphic correlation, the International Commission on Stratigraphy (ICS) r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halecomorphi
Halecomorphi is a taxon of ray-finned bony fish in the clade Neopterygii. The sole living Halecomorph is the bowfin (''Amia calva''), but the group contains many extinct species in several families (including Amiidae, Caturidae, Liodesmidae, Sinamiidae) in the order Amiiformes, as well as the extinct orders Ionoscopiformes, Panxianichthyiformes, and Parasemionotiformes. The fossil record of halecomorphs goes back at least to the Early Triassic epoch. The Halecomorphi exhibit a combination of ancestral features, such as most heavily mineralized scales, but also by more derived or "modern" features, particularly in the structure of the skull (e.g. position and shape of preopercles). Unique derived traits (synapomorphies) of the Halecomorphi include: *Unique jaw articulation in which the quadrate and symplectic participate in the joint. *Lengthened dorsal fins (in some species) *Two biconcave vertebrae per segment in the posterior body region (a condition known as dip ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 fish lineages belong to the Agnatha, or jawless fish. Early examples include ''Haikouichthys''. During the late Cambrian, eel-like jawless fish called the conodonts, and small mostly armoured fish known as ostracoderms, first appeared. Most jawless fish are now extinct; but the extant lampreys may approximate ancient pre-jawed fish. Lampreys belong to the Cyclostomata, which includes the extant hagfish, and this group may have split early on from other agnathans. The earliest Gnathostomata, jawed vertebrates probably developed during the late Ordovician period. They are first represented in the fossil record from the Silurian by two groups of fish: the armoured fish known as Placodermi, placoderms, which evolved from the ostracoderms; and the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pectoral Fins
Fins are distinctive anatomical features composed of bony spines or rays protruding from the body of a fish. They are covered with skin and joined together either in a webbed fashion, as seen in most bony fish, or similar to a flipper, as seen in sharks. Apart from the tail or caudal fin, fish fins have no direct connection with the spine and are supported only by muscles. Their principal function is to help the fish swim. Fins located in different places on the fish serve different purposes such as moving forward, turning, keeping an upright position or stopping. Most fish use fins when swimming, flying fish use pectoral fins for gliding, and frogfish use them for crawling. Fins can also be used for other purposes; male sharks and mosquitofish use a modified fin to deliver sperm, thresher sharks use their caudal fin to stun prey, reef stonefish have spines in their dorsal fins that inject venom, anglerfish use the first spine of their dorsal fin like a fishing rod to lu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canada
Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by total area. Its southern and western border with the United States, stretching , is the world's longest binational land border. Canada's capital is Ottawa, and its three largest metropolitan areas are Toronto, Montreal, and Vancouver. Indigenous peoples have continuously inhabited what is now Canada for thousands of years. Beginning in the 16th century, British and French expeditions explored and later settled along the Atlantic coast. As a consequence of various armed conflicts, France ceded nearly all of its colonies in North America in 1763. In 1867, with the union of three British North American colonies through Confederation, Canada was formed as a federal dominion of four provinces. This began an accretion of provinces an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomasinotus
''Thomasinotus'' is an extinct genus of small prehistoric ray-finned fish that lived in the Induan age of the Early Triassic epoch in what is now Madagascar. It belongs to the early neopterygian family Parasemionotidae together with '' Albertonia'', ''Candelarialepis'', '' Icarealcyon'', ''Jacobulus'', ''Lehmanotus'', ''Parasemionotus'', '' Qingshania'', '' Stensioenotus'', '' Suius'', and ''Watsonulus''. 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 Parasemionotiformes Early Triassic fish Prehistoric animals of Madagascar Fossil taxa described in 1952 Prehistoric ray-finned fish genera {{triassic-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stensioonotus
''Stensionotus'' is an extinct genus of prehistoric bony fish that lived during the Early Triassic epoch in what is now Madagascar and China. It belongs to Parasemionotidae together with '' Albertonia'', ''Candelarialepis'', ''Jacobulus'', ''Lehmanotus'', ''Parasemionotus'', '' Qingshania'', '' Suius'', ''Thomasinotus'' and ''Watsonulus''. 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 Parasemionotiformes Early Triassic fish Prehistoric animals of China Prehistoric animals of Madagascar Prehistoric ray-finned fish genera {{triassic-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasemionotus
''Parasemionotus'' is an extinct genus of prehistoric bony fish that lived in the Induan age (geology), age of the Early Triassic epoch in what is now Madagascar. It is the name giving genus of the family (taxonomy), family Parasemionotidae and the order (taxonomy), order Parasemionotiformes. This clade includes, among others, the genera ''Albertonia'', ''Candelarialepis'', ''Jacobulus'', ''Lehmanotus'', ''Qingshania'', ''Stensioonotus, Stensioenotus'', ''Suius'', ''Thomasinotus'', ''Watsonulus'', and possibly additional genera like ''Promecosomina''. Parasemionotiforms had a global distribution during the Early Triassic. Species of this family are found in Greenland, Madagascar, Canada, India, China, United States, and possibly Australia. The type species ''Parasemionotus labordei'' was first described under the name ''Semionotus labordei'' by Ferdinand Priem. Jean Piveteau later erected the new genus name ''Parasemionotus'' for this species. It is not closely related with ''Semi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lehmanotus
''Lehmanotus'' is an extinct genus of prehistoric bony fish that lived during the Early Triassic epoch in what is now Madagascar. It belongs to Parasemionotidae together with '' Albertonia'', ''Candelarialepis'', '' Jacobulus'', ''Parasemionotus'', '' Qingshania'', '' Stensioenotus'', '' Suius'', '' Thomasinotus'' and ''Watsonulus''. 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 Parasemionotiformes Early Triassic fish Prehistoric animals of Madagascar Prehistoric ray-finned fish genera {{paleo-rayfinned-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jacobulus
''Jacobulus'' is an extinct genus of prehistoric ray-finned fish that lived during the Early Triassic epoch in what is now northern Madagascar 252.3 to 251.3 million years ago. The type species is ''Jacobulus novus'' (monotypy). It was a small fish less than in length. J. novus ecology was a grazer-detritivore. It belongs to the Parasemionotidae together with '' Albertonia'', ''Candelarialepis'', '' Icarealcyon'', ''Lehmanotus'', ''Parasemionotus'', '' Qingshania'', '' Stensioenotus'', '' Suius'', '' Thomasinotus'', and ''Watsonulus''. 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 Parasemionotiformes Early Triassic fish Prehistoric animals of Madagascar Prehistoric ray-finned fish genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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