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Parachucla Formation
The Parachucla Formation is a geologic formation in Florida. It preserves fossils dating back to the Paleogene period. Fossil content Mammals Fish Invertebrates See also * List of fossiliferous stratigraphic units in Florida See also * Paleontology in Florida References * {{DEFAULTSORT:Fossiliferous stratigraphic units in Florida Florida Stratigraphic units Stratigraphy of Florida Florida geography-related lists United States geology-related lists ... References * Paleogene Florida {{Paleogene-stub ... [...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] |
Metaxytherium
''Metaxytherium'' is an extinct genus of dugong that lived from the Oligocene until the end of the Pliocene. Fossil remains have been found in Africa, Europe, North America and South America. Generally marine seagrass specialists, they inhabited the warm and shallow waters of the Paratethys, Mediterranean, Caribbean Sea and Pacific coastline. American species of ''Metaxytherium'' are considered to be ancestral to the North Pacific family Hydrodamalinae, which includes the giant Steller's Sea Cow. Discovery and naming The first remains of ''Metaxytherium'' were described in 1822 by Anselme-Gaëtan Demarest as a species of Hippo, ''H. medius'' before the genus name ''Metaxytherium'' was coined in 1840 by De Christol. Although the type species was initially designated to be ''M. cuvieri'', later publications argued that the two species are synonymous and ''M. medium'' thus holds precedence. The grammatical changes of the species name were made to match the rules of the Internatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archaeobalanidae
In the past, Archaeobalanidae has been considered a family of barnacles of the order Sessilia. Research published in 2021 by Chan et al. resulted in the genera of Archaeobalanidae being merged with that of Balanidae, which now contains the members of both families. In the same work, Sessilia was not retained as an order of barnacles. See Also * Balanidae for the family containing former members of Archaeobalanidae. * List of Cirripedia genera These genera belong to Cirripedia, a subclass of barnacles in the phylum of Crustacea, as classified by Chan et al. (2021) and the World Register of Marine Species. Their classification into order, superfamily, family, and subfamily is included. ... for a list of barnacle families and genera. References Obsolete arthropod taxa {{Maxillopoda-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tergum
A ''tergum'' (Latin for "the back"; plural ''terga'', associated adjective tergal) is the dorsal ('upper') portion of an arthropod segment other than the head. The anterior edge is called the 'base' and posterior edge is called the 'apex' or 'margin'. A given tergum may be divided into hardened plates or sclerites commonly referred to as tergites. In a thoracic segment, for example, the tergum may be divided into an anterior notum and a posterior scutellum. Lateral extensions of a tergite are known as paranota (Greek for "alongside the back") or ''carinae'' (Latin for "keel"), exemplified by the flat-backed millipedes of the order Polydesmida. Kinorhynchs have tergal and sternal plates too, though seemingly not homologous with those of arthropods. Tergo-tergal is a stridulatory mechanism in which fine spines of the abdominal tergites are rubbed together to produce sound. This process is known as abdominal telescoping. Examples File:Andrena spiraeana abdomen.jpg , Abdom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concavus
''Concavus'' is a genus of barnacles. Species , WoRMS recognizes the following two species: * '' Concavus concavus'' (Bronn, 1831) — Pliocene– early Pleistocene; Western Europe. * '' Concavus crassostricola'' Zullo, 1984 — Early Miocene; North Carolina and northern Florida. Taxonomic history The genus was circumscribed by William A. Newman in 1982. His original list of subgenera and species for the genus was the following: * ''Concavus'' genus ** ''Concavus'' subgenus *** ''C. concavus'' ** ''Menesiniella'' subgenus *** ''C. (M.) aquila'' *** ''C. (M.) regalis'' ** ''Arossia'' subgenus *** ''C. (A.) panamensis'' **** ''C. (A.) p. panamensis'' **** ''C. (A.) p. eyerdami'' *** ''C. (A.) henryae'' Newman noted there were multiple fossil taxa in this genus, but didn't classify any except for the type species ''C. concavus''. In 1992, Victor A. Zullo revised the genus. He created a new subfamily, Concavinae, with '' Tamiosoma'' (the senior synonym of '' Menesinie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Balanidae
The Balanidae comprise a family of barnacles of the order Balanomorpha. As a result of research published in 2021 by Chan et al., the members of the family Archaeobalanidae were merged with this family. Genera These genera belong to the family Balanidae: * '' Acasta'' Leach, 1817 * '' Actinobalanus'' Moroni, 1967 * ''Amphibalanus'' Pitombo, 2004 * '' Archiacasta'' Kolbasov, 1993 * '' Armatobalanus'' Hoek, 1913 * '' Arossia'' Newman, 1982 * '' Austromegabalanus'' Newman, 1979 * ''Balanus'' Costa, 1778 (barnacle) * '' Bathybalanus'' Hoek, 1913 * '' Bryozobia'' Ross & Newman, 1996 * '' Chesaconcavus'' Zullo, 1992 * '' Chirona'' Gray, 1835 * '' Concavus'' Newman, 1982 * '' Conopea'' Say, 1822 * '' Eoatria'' Van Syoc & Newman, 2010 * '' Euacasta'' Kolbasov, 1993 * '' Fistulobalanus'' Zullo, 1984 * ''Fosterella'' Buckeridge, 1983 * '' Hesperibalanus'' Pilsbry, 1916 * '' Hexacreusia'' Zullo, 1961 * ''Megabalanus ''Megabalanus'' is a genus of barnacles in the family Balanidae. Members ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Balanus
''Balanus'' is a genus of barnacles in the family (biology), family Balanidae of the subphylum Crustacea. This genus is known in the fossil record from the Jurassic to the Quaternary periods (age range: from 189.6 to 0.0 million years ago.). Fossil shells within this genus have been found all over the world. Description The bodies of these organisms are totally enclosed by a stony gray-whitish shell. The size of these shells ranges from 5 millimeters to 10 centimeters. They take the form of a cone consisting of six plates fixed on the rocks. The active animal can only be observed within the water when the shell opens and the barnacles expose two branched appendages (Cirrus (biology), cirri ) regularly hitting the water to catch food. They mainly feed on plankton. Habitat These barnacles can be found in coastal areas at low shallow depth, although they can also be seen living out of the water. They commonly colonize stones, rocks and shells. They are found in abundance on the s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crustacean
Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean group can be treated as a subphylum under the clade Mandibulata. It is now well accepted that the hexapods emerged deep in the Crustacean group, with the completed group referred to as Pancrustacea. Some crustaceans ( Remipedia, Cephalocarida, Branchiopoda) are more closely related to insects and the other hexapods than they are to certain other crustaceans. The 67,000 described species range in size from '' Stygotantulus stocki'' at , to the Japanese spider crab with a leg span of up to and a mass of . Like other arthropods, crustaceans have an exoskeleton, which they moult to grow. They are distinguished from other groups of arthropods, such as insects, myriapods and chelicerates, by the possession of biramous (two-parted) l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
4-25 Angustidens
A coxless four is a rowing boat used in the sport of competitive rowing. It is designed for four persons who propel the boat with sweep oars, without a coxswain. The crew consists of four rowers, each having one oar. There are two rowers on the stroke side (rower's right hand side) and two on the bow side (rower's lefthand side). There is no coxswain, but the rudder is controlled by one of the crew, normally with the rudder cable attached to the toe of one of their shoes which can pivot about the ball of the foot, moving the cable left or right. The steersman may row at bow, who has the best vision when looking over their shoulder, or on straighter courses stroke may steer, since they can point the stern of the boat at some landmark at the start of the course. The equivalent boat when it is steered by a coxswain is called a "coxed four". Racing boats (often called "shells") are long, narrow, and broadly semi-circular in cross-section with gradual tapers, causing little dra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Megatoothed Shark
Otodontidae is an extinct family of sharks belonging to the order Lamniformes. Its members have been described as megatoothed sharks. They lived from the Early Cretaceous to the Pliocene, and included genera such as ''Carcharocles'' and '' Otodus,'' including the giant megalodon. Recent studies of the newly described genus ''Megalolamna'' indicate that the members of the genus ''Carcharocles'' should be reclassified as members of the genus ''Otodus''. The genus ''Cretalamna ''Cretalamna'' is a genus of extinct otodontid shark that lived from the latest Early Cretaceous to Eocene epoch (about 103 to 46 million years ago). It is considered by many to be the ancestor of the largest sharks to have ever lived, ''Otodus ...'' which lived from the mid-Cretaceous-Paleogene is believed to be directly ancestral to ''Otodus,'' and thus to megalodon. References Shark families Albian first appearances Pliocene extinctions {{paleo-shark-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Otodus Angustidens
''Otodus angustidens'' is a species of prehistoric megatoothed sharks in the genus '' Otodus'', which lived during the Oligocene and Miocene epochs about 33 to 22 million years ago. This shark is related to another extinct megatoothed shark, ''Otodus megalodon''. Taxonomy The Swiss naturalist Louis Agassiz, first identified this shark as a species of genus '' Carcharodon'' in 1835. In 1964, shark expert, L. S. Glikman recognized the transition of '' Otodus obliquus'' to ''C. auriculatus'' and moved ''C. angustidens'' to genus ''Otodus''. (See "external links" below) However, in 1987, shark expert H. Cappetta recognized the ''C. auriculatus'' - ''C. megalodon'' lineage and placed all related megatooth sharks along with this species in the genus ''Carcharocles''. The complete ''Otodus obliquus'' to ''C. megalodon'' transition then became clear and has since gained the acceptance of many other experts with the passage of time. Within the ''Carcharocles'' lineage, ''C. angustide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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