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Tamaguélelt Formation
The Tamaguélelt Formation is an Ypresian, Early Eocene-aged geological formation in Mali. It comprises phosphorite sediments deposited within the Trans-Saharan seaway. Many of the preserved fossils of the formation indicate that it was a marginal marine habitat. In addition to these marine fossils, fossils of freshwater and terrestrial animals are also common in the formation, due to a vast freshwater network that regularly deposited fossils into the seaway. Fossil content Reptiles Squamata Crocodylomorpha Ray-finned fish Lobe-finned fish Mammals Proboscidea Hyracoidea Mollusca Bivalvia Cephalopoda References {{Reflist Fossiliferous stratigraphic units of Africa Ypresian Stage Paleontology in Mali Eocene Series of Africa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Formation
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness (geology), thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tilemsisuchus
''Tilemsisuchus'' is an extinct genus of dyrosaurid crocodyliform which existed in what is now Mali during the Eocene period. It was first named by Eric Buffetaut in 1979 and contains the species ''Tilemsisuchus lavocati''.''Wounds on the jaw of an Eocene mesosuchian crocodilian as possible evidence for the antiquity of crocodilian intraspecific fighting behaviour'', by Eric Buffetaut, Laboratoire de Paléontologie des Vertébrés, Université Paris VI, 4 place Jussieu, 75230 Paris Cedex 05, France References External links ''Tilemsisuchus''at the Paleobiology Database The Paleobiology Database (PBDB) is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database originated in the NCEAS-funded Phanerozoic Marine Pale ... Eocene crocodylomorphs Paleocene reptiles of Africa Prehistoric pseudosuchian genera Prehistoric marine crocodylomorphs Taxa named by Éric Buffetaut [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vidalamiinae
The Amiidae are a family of basal (phylogenetics), basal ray-finned fishes. The bowfin and the eyespot bowfin (''Amia ocellicauda'') are the only two species to survive today, although additional species in all four subfamilies of Amiidae are known from Jurassic, Cretaceous, and Eocene fossils. Bowfins are now found throughout eastern North America, typically in slow-moving backwaters, canals, and ox-bow lakes. When the oxygen level is low (as often happens in still waters), the bowfin can rise to the surface and gulp air into its swim bladder, which is lined with blood vessels and can serve as a primitive lung. Amiidae is a monophyletic group that has numerous synapomorphic characters. Amiidae were widespread and particularly rich in species during the Eocene era. During this era, they appeared to be confined almost exclusively to fresh water. Taxonomy The family is divided into five subfamilies, with 16 genera *Amiidae **Subfamily Amiinae (latest Cretaceous -Present) ***Genu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maliamia
''Maliamia'' ("Malian bowfin") is an extinct genus of Amiidae, amiid ray-finned fish from the Early Eocene, known from fragmentary remains found in the Tamaguélelt Formation of Mali. It was described in 1989, based on fossils recovered by three separate expeditions in 1975, 1979–80, and 1981. The type species is ''Maliamia gigas,'' named in reference to its large size. ''Maliamia'' is currently the youngest known member of Vidalamiinae, an extinct group of bowfin fish that lived from the Early Cretaceous to the Early Eocene. Description ''Maliamia gigas'' is known from isolated jaw remains including premaxillae, vomers, maxillae, and dentaries. These fragments lack teeth due to post-mortem wear, but empty tooth sockets remain, and their arrangement implies that ''M. gigas'' had a single row of teeth. Estimates put the body length of ''M. gigas'' between 1.8 (based on ''Calamopleurus'') and 3.5 meters (based on ''Amia (fish), Amia''), making it the largest known member of Vi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cylindracanthus Rectus
''Cylindracanthus'' is an extinct, enigmatic genus of marine Actinopterygii, ray-finned fish with fossils known throughout North America, Europe, Asia and Africa from the Late Cretaceous to the late Eocene'''', with potential Oligocene records and a possible Miocene record also known.'''' It is exclusively known from its distinctive partial remains, which are long cylindrical bony spines that are usually considered Rostrum (anatomy), rostrum fragments, as well as some associated teeth. These spines are abundant & widespread throughout this timespan, and are useful indicators of a nearshore marine environment, but the taxonomic identity of the fish is still highly uncertain and debated.''BARBARA S. GRANDSTAFF, RODRIGO A. PELLEGRINI ,, KENNETH A. MONSCH, DAVID C. PARRIS and DONALD CLEMENTOVER A CENTURY OF THIN-SECTION MICROSCOPY OF THE FOSSIL FISH CYLINDRACANTHUSNEW JERSEY STATE MUSEUM INVESTIGATIONS NO. 6, 2018'' Taxonomy Most of the earlier-described species in this genus were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cylindracanthus
''Cylindracanthus'' is an extinct, enigmatic genus of marine ray-finned fish with fossils known throughout North America, Europe, Asia and Africa from the Late Cretaceous to the late Eocene'''', with potential Oligocene records and a possible Miocene record also known.'''' It is exclusively known from its distinctive partial remains, which are long cylindrical bony spines that are usually considered rostrum fragments, as well as some associated teeth. These spines are abundant & widespread throughout this timespan, and are useful indicators of a nearshore marine environment, but the taxonomic identity of the fish is still highly uncertain and debated.''BARBARA S. GRANDSTAFF, RODRIGO A. PELLEGRINI ,, KENNETH A. MONSCH, DAVID C. PARRIS and DONALD CLEMENTOVER A CENTURY OF THIN-SECTION MICROSCOPY OF THE FOSSIL FISH CYLINDRACANTHUSNEW JERSEY STATE MUSEUM INVESTIGATIONS NO. 6, 2018'' Taxonomy Most of the earlier-described species in this genus were previously classified in ''Coelorhy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Catfish
Catfish (or catfishes; order (biology), order Siluriformes or Nematognathi) are a diverse group of ray-finned fish. Catfish are common name, named for their prominent barbel (anatomy), barbels, which resemble a cat's whiskers, though not all catfish have prominent barbels or "whiskers", with some seemingly not having them. Siluriformes as a whole are Fish scale, scale-less, with neither the Armoured catfish, armour-plated nor the naked species having scales. This order of fish are Autapomorphy, defined by features of the skull and swimbladder. Catfish range in size and behavior from the three List of largest fish, largest species alive, the Mekong giant catfish from Southeast Asia, the wels catfish of Eurasia, and the piraíba of South America, to detritivorous and scavenging bottom feeders, down to tiny ectoparasitic species known as the Candiru (fish), candirus. In the Southern United States, catfish species may be known by a variety of slang names, such as "mud cat", " ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Claroteidae
The Claroteidae are a family of catfish (order Siluriformes) found in Africa. This family was separated from Bagridae. However, the monophyly of the family is sometimes contested. The 9 genera contain 65 known species of claroteids. The family Auchenoglanididae was formerly considered a subfamily of this family. This group was also often formerly placed in Bagridae. A well-known species is the African big-eye catfish, '' Chrysichthys longipinnis''. Claroteids have moderately elongated bodies, usually with four pairs of barbels, an adipose fin, and strong pectoral and dorsal fin spines. The earliest known fossil member of the Claroteidae is '' Nigerium'' from the Late Paleocene and Early Eocene of Nigeria and Mali. The extinct genus '' Eaglesomia'' is also known from the Middle Eocene of Nigeria. The Late Eocene genus '' Fajumia'' from Egypt is of uncertain affinities, but most likely belongs to this group. In addition, extinct species of the extant genus '' Chrysichthys'' are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brychaetus Muelleri Skull And Anterior Body
''Brychaetus'' is an extinct genus of prehistoric marine bonytongue fish known from the Late Cretaceous to the late Eocene of Europe, North America, and northern Africa. Taxonomy ''Brychaetus'' contains a single valid species, ''B. muelleri'' from the Ypresian of England (London Clay) and the eastern United States (Nanjemoy Formation in Maryland and Virginia, Tuscahoma Formation of Mississippi), with specimens from elsewhere being placed only at genus level due to their fragmentary nature. A record of ''B. muelleri'' from the Paleocene of Niger was reassigned to an extinct arowana, '' Scleropages africanus''. Another species, ''B. schnarrenbergeri'' Zotz, 1928, was described from the Eocene of Alsace (France), but its assignment to ''Brychaetus'' was later found to be a misidentification. Another species, ''B. caheni'' from the Paleocene of Cabinda (Angola), was later reclassified into its own genus, '' Ridewoodichthys.'' It was the first marine bonytongue described from the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bonytongue
Osteoglossidae is a family of large-sized freshwater fish, which includes the arowanas. They are commonly known as bonytongues. The family has been regarded as containing two extant subfamilies Arapaiminae and Osteoglossinae, with a total of five living genera, but these are regarded as valid families in ''Eschmeyer's Catalog of Fishes'' The extinct Phareodontinae are known from worldwide during the Late Cretaceous and Paleogene; they are generally considered to be crown group osteoglossids that are more closely related to one of the extant osteoglossid subfamilies than the other, though their exact position varies. Evolution Osteoglossids are basal teleosts that originated during the Cretaceous, and are placed in the actinopterygian order Osteoglossiformes. The traditionally defined wider family includes several extant species from South America, one from Africa, two from Asia, and two from Australia. The earliest known osteoglossid is ''Cretophareodus'' from the middle Cam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brychaetus
''Brychaetus'' is an extinct genus of prehistoric marine bonytongue fish known from the Late Cretaceous to the late Eocene of Europe, North America, and northern Africa. Taxonomy ''Brychaetus'' contains a single valid species, ''B. muelleri'' from the Ypresian of England (London Clay) and the eastern United States (Nanjemoy Formation in Maryland and Virginia, Tuscahoma Formation of Mississippi), with specimens from elsewhere being placed only at genus level due to their fragmentary nature. A record of ''B. muelleri'' from the Paleocene of Niger was reassigned to an extinct arowana, '' Scleropages africanus''. Another species, ''B. schnarrenbergeri'' Zotz, 1928, was described from the Eocene of Alsace (France), but its assignment to ''Brychaetus'' was later found to be a misidentification. Another species, ''B. caheni'' from the Paleocene of Cabinda (Angola), was later reclassified into its own genus, '' Ridewoodichthys.'' It was the first marine bonytongue described from th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Actinopterygii
Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class (biology), class of Osteichthyes, bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fish fin, fins made of webbings of skin supported by radially extended thin bony spine (zoology), spines called ''lepidotrichia'', as opposed to the bulkier, fleshy lobed fins of the sister taxon, sister clade Sarcopterygii (lobe-finned fish). Resembling folding fans, the actinopterygian fins can easily change shape and wetted area, providing superior thrust-to-weight ratios per movement compared to sarcopterygian and chondrichthyian fins. The fin rays attach directly to the proximal or basal skeletal elements, the radials, which represent the articulation (anatomy), articulation between these fins and the internal skeleton (e.g., pelvic and pectoral girdles). The vast majority of actinopterygians are teleosts. By species count, they domi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
