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Amphiaspidida
Amphiaspidida is a taxon of extinct Cyathaspidiformes, cyathaspidid heterostraci, heterostracan agnathans whose fossils are restricted to Lower Devonian marine strata of Siberia near the Taimyr Peninsula. Some authorities treat it as a suborder of Cyathaspidiformes,Lundgren, Mette, and Henning Blom. "Phylogenetic relationships of the cyathaspidids (Heterostraci)." GFF 135.1 (2013): 74-84. while others treat it as an order (biology), order in its own right as "Amphiaspidiformes."Novitskaya, Larisse. Les amphiaspides (Heterostraci) du Devonien de la Siberie. Éditions du Centre national de la recherche scientifique, 1971. In life, they are thought to be benthic animals that lived most of their lives mostly buried in the sediment of a series of hypersaline lake, hypersaline lagoons. Amphiaspids are easily distinguished from other heterostracans in that all of the plates of the cephalothorax armor are fused into a single, Muff (handwarmer), muff-like unit, so that the forebody of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyathaspidiformes
Cyathaspidiformes is an extinct order of heterostracan vertebrates known from extensive fossil remains primarily from Silurian to Early Devonian strata of Europe, and North America, and from Early Devonian marine strata of Siberia. Anatomy Like their descendants, the pteraspidids, all cyathaspidiform heterostracans had the cephalothorax enclosed in armor, formed from several plates, including dorsal, ventral, a dorsal spine derived from a scale, and a large, scale-covered tail. Thus, the living animals would have resembled tadpoles encased in massive armor. The majority of taxa have the rostral and pineal plates fused or merged with the dorsal plate, and in the amphiaspidids, all the plates of the cephalothorax were fused together into a single "muff-like" unit. Unlike the pteraspidids, all cyathaspidiforms are thought to be almost uniformly benthic in lifestyle, though only the amphiaspids and the ctenaspids are thought to be burrowers. Taxonomy The taxonomy of Cyathaspidif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amphiaspididae
Amphiaspididae is a family of extinct amphiaspidid heterostracan agnathans whose fossils are restricted to Lower Devonian marine strata of Siberia near the Taimyr Peninsula The Taymyr Peninsula ( ) is a peninsula in the Far North of Russia, in the Siberian Federal District, that forms the northernmost part of the mainland of Eurasia. Administratively it is part of the Krasnoyarsk Krai Federal subject of Russia. Ge .... In life, the amphiaspidids of Amphiaspididae are thought to be benthic animals that lived most of their lives mostly buried in the sediment of a series of hypersaline lagoons. Amphiaspids are easily distinguished from other heterostracans in that all of the plates of the cephalothorax armor are fused into a single, muff-like unit, so that the forebody of the living animal would have looked like a potpie with a pair of small, or degenerated eyes, with each flanked by a preorbital opening, and a simple, slit-like mouth. Taxonomy ''Amphiaspis'' ''Amphiaspis a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amphoraspis
''Amphoraspis stellata'' is an amphiaspidid heterostracan in the family Amphiaspididae. Its fossils are restricted to early Devonian-aged marine strata of the Taimyr Peninsula, Siberia. ''A. stellata'', as with all other amphiaspidids, is thought to have been a benthic filter feeder that lived on top of, or buried just below the surface of the substrate of hypersaline lagoon-bottoms. So far, ''A. stellata'' is known from at least one, 14 centimeter-long, broad and dorsally rounded cephalothoracic armor that is shaped vaguely like, as the generic name suggests, an amphora An amphora (; ; English ) is a type of container with a pointed bottom and characteristic shape and size which fit tightly (and therefore safely) against each other in storage rooms and packages, tied together with rope and delivered by land ....Novitskaya L.I.; Karatayute Talimaa V.N., 1989: New amphiaspididae from the lower devonian deposits in taimyr russian sfsr ussr. Paleontologicheskii Zhurnal.(3 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Olbiaspididae
Olbiaspididae is a family of extinct amphiaspidid heterostracan agnathans whose fossils are restricted to Lower Devonian marine strata of Siberia near the Taimyr Peninsula. In life, all amphiaspidids are thought to be benthic animals that lived most of their lives mostly buried in the sediment of a series of hypersaline lagoons. Amphiaspids are easily distinguished from other heterostracans in that all of the plates of the cephalothoracic armor are fused into a single, muff-like unit, so that the forebody of the living animal would have looked, in the case of olbiaspidids, vaguely like a hot water bottle with a pair of small, or degenerated eyes, with each flanked by a preorbital opening, and a simple, slit-like mouth positioned at the anteriormost portion of the cephalothoracic armor. Olbiaspidids differ from the amphiaspidoid amphiaspids of Amphiaspididae Amphiaspididae is a family of extinct amphiaspidid heterostracan agnathans whose fossils are restricted to Lower ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amphiaspis
''Amphiaspis argo'' is the type species of the cyathaspidid taxon Amphiaspidida, and of the family Amphiaspididae.Novitskaya, Larisse. Les amphiaspides (Heterostraci) du Devonien de la Siberie. Éditions du Centre national de la recherche scientifique, 1971. Its fossils are restricted to early Emsian-aged marine strata of the Taimyr Peninsula, Early Devonian Siberia. ''A. argo'', as with all other amphiaspidids, is thought to have been a benthic filter feeder that lived on top of, or buried just below the surface of the substrate of hypersaline A hypersaline lake is a landlocked body of water that contains significant concentrations of sodium chloride, brines, and other salts, with saline levels surpassing those of ocean water (3.5%, i.e. ). Specific microbial species can thrive i ... lagoon-bottoms. Anatomy So far, ''A. argos'' is known from at least one, incomplete cephalothoracic armor that is shaped vaguely like a pillow and is, from anterior to posterior, 24 centi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amphiaspidoidei
Amphiaspidoidei is a taxon of extinct amphiaspidid heterostracan agnathans whose fossils are restricted to Lower Devonian marine strata of Siberia near the Taimyr Peninsula. In life, the amphiaspidids of Amphiaspidoidei are thought to be benthic animals that lived most of their lives mostly buried in the sediment of a series of hypersaline lagoons. Amphiaspids are easily distinguished from other heterostracans in that all of the plates of the cephalothorax armor are fused into a single, muff-like unit, so that the forebody of the living animal would have looked like a potpie or a hot waterbottle with a pair of small, or degenerated eyes flanked by preorbital openings, a pair of branchial openings for exhaling, and a simple, slit-like mouth. Taxonomy The superfamily Amphiaspidoidei contains four families. Amphiaspididae This family contains two monotypic genera, including the type genus ''Amphiaspis'', and ''Amphoraspis ''Amphoraspis stellata'' is an amphiaspidid hete ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hibernaspis
''Hibernaspis'' is a genus of extinct amphiaspidid heterostracan agnathans whose fossils are restricted to Lower Devonian marine strata of Siberia near the Taimyr Peninsula. In life, species of ''Hibernaspis'' were thought to be benthic animals that lived most of their lives mostly buried in the sediment of a series of hypersaline lagoons. All amphiaspids are easily distinguished from other heterostracans in that all of the plates of the cephalothorax armor are fused into a single, muff-like unit, so that, in the case of ''Hibernaspis'', the forebody of the living animal would have looked like a large guitar pic with serrated edges, with a pair of tiny, degenerated eyes, a pair of branchial openings for exhaling, and a simple, slit-like mouth at the anterior end. There are two species of ''Hibernaspis'', ''H. macrolepis'', the type species In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hibernaspidoidei
Hibernaspidoidei is a taxon of extinct amphiaspidid heterostracan agnathans whose fossils are restricted to Lower Devonian marine strata of Siberia near the Taimyr Peninsula. In life, hibernaspid amphiaspidids are thought to be benthic animals that lived most of their lives mostly buried in the sediment of a series of hypersaline lagoons. All amphiaspids are easily distinguished from other heterostracans in that all of the plates of the cephalothorax armor are fused into a single, muff-like unit, so that the forebody of the living animal would have looked like a potpie or a hot waterbottle with a pair of small, or degenerated eyes, a pair of branchial openings for exhaling, and, in the case of hibernaspids, a simple, slit-like mouth at the anterior end of a tube-like head. Taxonomy Hibernaspidoidei contains three families. Hibernaspididae This family is monotypic, containing only the genus ''Hibernaspis ''Hibernaspis'' is a genus of extinct amphiaspidid heterostraca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edaphaspis
''Edaphaspis bystrowi'' is an extinct amphiaspidid cyathaspidid heterostracan.Novitskaya, Larisse. Les amphiaspides (Heterostraci) du Devonien de la Siberie. Éditions du Centre national de la recherche scientifique, 1971. Its fossils are restricted to early Devonian-aged marine strata of the Taimyr Peninsula, Early Devonian Siberia. ''E. bystrowi'', as with all other amphiaspidids, is thought to have been a benthic filter feeder that lived on top of, or buried just below the surface of the substrate of hypersaline lagoon-bottoms. It is the only representative of the family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ... Edaphaspididae. Anatomy ''E. bystrowi'' is known from a mostly complete cephalothoracic armor that is 16 centimeters long, and 21 centimeters wide. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gabreyaspididae
Gabreyaspididae is a family of extinct amphiaspidid heterostracan agnathans whose fossils are restricted to Lower Devonian marine strata of Siberia near the Taimyr Peninsula.Novitskaya, Larisse. Les amphiaspides (Heterostraci) du Devonien de la Siberie. Éditions du Centre national de la recherche scientifique, 1971. In life, all amphiaspidids are thought to be benthic animals that lived most of their lives mostly buried in the sediment of a series of hypersaline lagoons. Amphiaspids are easily distinguished from other heterostracans in that all of the plates of the cephalothoracic armor are fused into a single, muff-like unit, so that the forebody of the living animal would have looked, in the case of gabreyaspidids, vaguely like a horseshoe crab with a pair of small, or degenerated eyes, with each flanked by a preorbital opening, and a simple, slit-like mouth positioned slightly ventrally. Gabreyaspidids differ from the amphiaspidoid amphiaspids of Amphiaspididae primaril ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eglonaspididae
Eglonaspididae is a family of extinct amphiaspidid heterostracan agnathans whose fossils are restricted to Lower Devonian marine strata of Siberia near the Taimyr Peninsula. In life, all of the amphiaspidids are thought to be benthic animals that lived most of their lives mostly buried in the sediment of a series of hypersaline lagoons. Amphiaspids are easily distinguished from other heterostracans in that all of the plates of the cephalothoracic armor are fused into a single, muff-like unit, so that the forebody of the living animal would have looked, in the case of elgonaspidids, very much like a hot water bottle with or without a pair of small, degenerated eyes and a simple, slit-like mouth positioned at the anteriormost portion of the cephalothoracic armor. Taxonomy ''Eglonaspis'' ''Eglonaspis'' has a flattened, triangular-shaped cephalothoracic shield with large, crenulated fringes at the posteriolateral ends, and an elongated, tube-like head. Unlike most of its close ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siberiaspidoidei
Siberiaspidoidei is a taxon of extinct amphiaspidid heterostracan agnathans whose fossils are restricted to Lower Devonian marine strata of Siberia near the Taimyr Peninsula. In life, siberiaspids are thought to be benthic animals that lived most of their lives mostly buried in the sediment of a series of hypersaline lagoons. As with all amphiaspids, siberiaspids are easily distinguished from other heterostracans in that all of the plates of the cephalothorax armor are fused into a single, muff-like unit, so that the forebody of the living animal would have looked like a flattened potpie or a hot waterbottle with a pair of small, or degenerated eyes sometimes flanked by preorbital openings, a pair of branchial openings for exhaling, and a simple, slit-like, or tube-like mouth. Taxonomy Siberiaspidoidei contains two families, Siberiaspididae, and Tuxeraspididae. Siberiaspididae This family contains two monotypic In biology, a monotypic taxon is a taxonomic group (ta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
