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Rhombodus
''Rhombodus'' is a prehistoric genus of ray belonging to the family Rhombodontidae. Species within this genus lived from the Cretaceous period, Maastrichtian age to the Paleocene epoch, from 70.6 to 55.8 million years ago. Species Species within this genus include: *''Rhombodus andriesi '' Noubhani and Cappetta 1994 *''Rhombodus binkhorsti'' Dames, 1881 North America *''Rhombodus bondoni '' Arambourg 1952 *''Rhombodus carentonensis'' Vullo 2005 *''Rhombodus ibericus'' Kriwet et al. 2007 *''Rhombodus laevis'' Cappetta and Case 1975 *''Rhombodus meridionalis'' Arambourg 1952 *''Rhombodus microdon'' Arambourg 1952 Description ''Rhombodus'' species could reach a length of . This genus is known from its caudal spines and rhombic teeth, which are all that usually fossilises. These rhombic teeth are bilobate, with vertical wrinkles and a width of about .Jim Bourdo/ref> Distribution Fossils have been found in the sediments of Africa, Europe, Asia and the Americas. See also * F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhombodus NT Small
''Rhombodus'' is a prehistoric genus of ray belonging to the family Rhombodontidae. Species within this genus lived from the Cretaceous period, Maastrichtian age to the Paleocene epoch, from 70.6 to 55.8 million years ago. Species Species within this genus include: *''Rhombodus andriesi '' Noubhani and Cappetta 1994 *''Rhombodus binkhorsti'' Dames, 1881 North America *''Rhombodus bondoni '' Arambourg 1952 *''Rhombodus carentonensis'' Vullo 2005 *''Rhombodus ibericus'' Kriwet et al. 2007 *''Rhombodus laevis'' Cappetta and Case 1975 *''Rhombodus meridionalis'' Arambourg 1952 *''Rhombodus microdon'' Arambourg 1952 Description ''Rhombodus'' species could reach a length of . This genus is known from its caudal spines and rhombic teeth, which are all that usually fossilises. These rhombic teeth are bilobate, with vertical wrinkles and a width of about .Jim Bourdo/ref> Distribution Fossils have been found in the sediments of Africa, Europe, Asia and the Americas. See also * F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Prehistoric Cartilaginous Fish (Chondrichthyes)
This list of prehistoric cartilaginous fish genera is an attempt to create a comprehensive listing of all genera that have ever been included in the class chondrichthyes ''and'' are known from the fossil record. This list excludes purely vernacular terms, genera that are now considered invalid, doubtful (nomina dubia), or were not formally published (nomina nuda), as well as junior synonyms of more established names, and genera that are no longer considered to be cartilaginous fish. It includes all commonly accepted genera. This list currently contains 804 generic names. * Extinct genera are marked by a dagger ( †). * Extant taxon genera are bolded. Naming conventions and terminology Naming conventions and terminology follow the International Code of Zoological Nomenclature. Technical terms used include: * Junior synonym: A name which describes the same taxon as a previously published name. If two or more genera are formally designated and the type specimens are later assi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flora And Fauna Of The Maastrichtian Stage
This is an incomplete list that briefly describes vertebrates that were Extant taxon, extant during the Maastrichtian, a stage of the Late Cretaceous Period which extended from 72.1 to 66 million years before present. This was the last time period in which non-avian dinosaurs, pterosaurs, plesiosaurs, and mosasaurs existed. Amphibians Dinosaurs †Ornithischians †Ankylosaurs †Parksosauridae †Ornithopoda †Ceratopsians †Pachycephalosauria, Pachycephalosaurs †Sauropoda, Sauropods †Theropoda, Theropods (non-maniraptoran) †Maniraptora (non-avian) =Avialans (avian theropods)= Chondrichthyes, Cartilaginous fish Crocodylomorpha, Crocodylomorphs Ray-finned fish Mammals †Plesiosaurs †Pterosaurs Squamata, Squamates Turtles †Choristodera, Choristoderes References See also * List of fossil sites ''(with link directory)'' * Cretaceous–Paleogene extinction event {{Cretaceous Footer Maastrichtian life, * Late ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Khouribga
Khouribga ( ber, ⵅⵯⵔⵉⴱⴳⴰ, xʷribga; ar, خريبڭة, ḵurībga, ) is the capital of Khouribga Province in the Béni Mellal-Khénifra Regions of Morocco, region, Morocco. With a population of 196,196 (2014 census), Khouribga owes its growth to the phosphate deposits nearby. Geography Located at 120 km from Casablanca, 154 km from the capital, Rabat, more than 200 km from the city of Marrakesh, and about 99 km from the city of Beni Mellal and 60 km from the city of Settat. Khouribga is located 820 meters above sea level on the Ouardigha plateau. The city was founded in 1923 by the authorities of the French protectorate in Morocco, French protectorate when they discovered phosphate in the region, for which Morocco is considered to be the biggest exporter in the world. There are several mines in the province, most notably the mine of Sidi Shennan near the town of Oued Zem, which lies 30 km from the village of Boulanouar (5 km) and th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the Latin ''creta'', "chalk", which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation ''Kreide''. The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now- extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was ice free, and forests extended to the poles. During this time, new groups of mammals and birds appeared. During the Early Cretaceous, flowering plants appeared and began to rapidly diversify, becoming the dominant group of plants across the Earth b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleocene
The Paleocene, ( ) or Palaeocene, is a geological epoch (geology), epoch that lasted from about 66 to 56 mya (unit), million years ago (mya). It is the first epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name is a combination of the Ancient Greek ''palaiós'' meaning "old" and the Eocene Epoch (which succeeds the Paleocene), translating to "the old part of the Eocene". The epoch is bracketed by two major events in Earth's history. The K–Pg extinction event, brought on by Chicxulub impact, an asteroid impact and possibly volcanism, marked the beginning of the Paleocene and killed off 75% of living species, most famously the non-avian dinosaurs. The end of the epoch was marked by the Paleocene–Eocene Thermal Maximum (PETM), which was a major climatic event wherein about 2,500–4,500 gigatons of carbon were released into the atmosphere and ocean systems, causing a spike in global temperatures and ocean acidification. In the Pal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animalia
Animals are multicellular, eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, can reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of cells, the blastula, during embryonic development. Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a bilaterally symmetric body plan. The Bilateria include the protostomes, containing animals such as nematodes, arthropods, flatworms, annelids and molluscs, and the deuterostomes, containing the echinode ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chordata
A chordate () is an animal of the phylum Chordata (). All chordates possess, at some point during their larval or adult stages, five synapomorphies, or primary physical characteristics, that distinguish them from all the other taxa. These five synapomorphies include a notochord, dorsal hollow nerve cord, endostyle or thyroid, pharyngeal slits, and a post-anal tail. The name “chordate” comes from the first of these synapomorphies, the notochord, which plays a significant role in chordate structure and movement. Chordates are also Bilateral symmetry, bilaterally symmetric, have a coelom, possess a circulatory system, and exhibit Metameric, metameric segmentation. In addition to the morphological characteristics used to define chordates, analysis of genome sequences has identified two conserved signature indels (CSIs) in their proteins: cyclophilin-like protein and mitochondrial inner membrane protease ATP23, which are exclusively shared by all vertebrates, tunicates and cep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chondrichthyes
Chondrichthyes (; ) is a class that contains the cartilaginous fishes that have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or ''bony fishes'', which have skeletons primarily composed of bone tissue. Chondrichthyes are jawed vertebrates with paired fins, paired nares, scales, and a heart with its chambers in series. Extant chondrichthyes range in size from the 10 cm (3.9 in) finless sleeper ray to the 10 m (32 ft) whale shark. The class is divided into two subclasses: Elasmobranchii (sharks, rays, skates, and sawfish) and Holocephali ( chimaeras, sometimes called ghost sharks, which are sometimes separated into their own class). Within the infraphylum Gnathostomata, cartilaginous fishes are distinct from all other jawed vertebrates. Anatomy Skeleton The skeleton is cartilaginous. The notochord is gradually replaced by a vertebral column during development, except in Holocephali, where the notochord stays intact. In some deepwat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rajiformes
Rajiformes is one of the four orders in the superorder Batoidea, flattened cartilaginous fishes related to sharks. Rajiforms are distinguished by the presence of greatly enlarged pectoral fins, which reach as far forward as the sides of the head, with a generally flattened body. The undulatory pectoral fin motion diagnostic to this taxon is known as rajiform locomotion. The eyes and spiracles are located on the upper surface of the head and the gill slits are on the underside of the body. Most species give birth to live young, although some lay eggs enclosed in a horny capsule ("mermaid's purse"). Characteristics Rajoids typically have a dorsoventrally flattened body. The snout is slender and pointed and the wide mouth, often covered with a fleshy nasal flap, is on the underside of the head. The eyes and well-developed spiracles are located on the top of the head. In most species, the spiracles are large and are the main means of drawing water in for respiration. There is no n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ray (fish)
Batoidea is a superorder of cartilaginous fishes, commonly known as rays. They and their close relatives, the sharks, comprise the subclass Elasmobranchii. Rays are the largest group of cartilaginous fishes, with well over 600 species in 26 families. Rays are distinguished by their flattened bodies, enlarged pectoral fins that are fused to the head, and gill slits that are placed on their ventral surfaces. Anatomy Batoids are flat-bodied, and, like sharks, are cartilaginous fish, meaning they have a boneless skeleton made of a tough, elastic cartilage. Most batoids have five ventral slot-like body openings called gill slits that lead from the gills, but the Hexatrygonidae have six. Batoid gill slits lie under the pectoral fins on the underside, whereas a shark's are on the sides of the head. Most batoids have a flat, disk-like body, with the exception of the guitarfishes and sawfishes, while most sharks have a spindle-shaped body. Many species of batoid have developed their p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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