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Diplacanthida
Diplacanthiformes (also known as Diplacanthida, Diplacanthoidei, or Diplacanthini) is an order of acanthodian fishes which lived during the Devonian Period. Subtaxa * ''incertae sedis'' ** Genus '' Bryantonchus'' ** Genus '' Culmacanthus'' ** Genus '' Devononchus'' ** Genus '' Striacanthus'' ** Genus ''Tetanopsyrus'' * Family Diplacanthidae ** Genus ''Diplacanthus ''Diplacanthus'' is an extinct genus of Mid to Late Devonian fish in the class Acanthodii, known as spiny sharks. Classification The genus was named by Louis Agassiz in 1843. It was formerly regarded as belonging to the Climatiformes but r ...'' ** Genus '' Milesacanthus'' ** Genus '' Ptychodictyon'' ** Genus '' Rhadinacanthus'' * Family Gladiobranchidae? ** Genus '' Gladiobranchus'' ** Genus '' Uraniacanthus''? References Acanthodii Prehistoric fish orders Devonian fish Devonian first appearances Devonian extinctions {{Acanthodii-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acanthodii
Acanthodii or acanthodians is an extinct class of gnathostomes (jawed fishes), typically considered a paraphyletic group. They are currently considered to represent a grade of various fish lineages leading up to the extant Chondrichthyes, which includes living sharks, rays, and chimaeras. Acanthodians possess a mosaic of features shared with both osteichthyans (bony fish) and chondrichthyans (cartilaginous fish). In general body shape, they were similar to modern sharks, but their epidermis was covered with tiny rhomboid platelets like the scales of holosteians (gars, bowfins). A lower Silurian species, ''Fanjingshania renovata'', attributed to Climatiiformes is the oldest chondrichthyan with known anatomical features. The popular name "spiny sharks" is because they were superficially shark-shaped, with a streamlined body, paired fins, a strongly upturned tail, and stout, largely immovable bony spines supporting all the fins except the tail—hence, "spiny sharks". However, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diplacanthus
''Diplacanthus'' is an extinct genus of Mid to Late Devonian fish in the class Acanthodii, known as spiny sharks. Classification The genus was named by Louis Agassiz in 1843. It was formerly regarded as belonging to the Climatiformes but recently reassigned to the Diplacanthiformes, in which it is united with, amongst others, ''Rhadinacanthu''s, '' Uraniacanthus'', and '' Culmacanthus''. Diplacanthiforms were widespread during the Middle and early Late Devonian. They are best represented in the Middle Devonian, by articulated fossils, fin spines, and abundant scales, the latter particularly from northern Europe. In a latest revision of the genus ''Diplacanthus,'' a large number of species from Europe were synonymized with earlier Scottish species, and these too were redefined. D. ''crassisimus'' was taken to have precedence over D. ''striatus'' as the name of the type specimen. ''Diplacanthus longispinus'' was reassigned to ''Rhadinacanthus longispinus'', within which we ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetanopsyrus
''Tetanopsyrus'' is a genus of Acanthodii. There are two species of this genus that lived through the lower Devonian (Lochkovian The Lochkovian is one of three faunal stages in the Early Devonian Epoch. It lasted from 419.2 ± 3.2 million years ago to 410.8 ± 2.8 million years ago. It marked the beginning of the Devonian Period, and was followed by the Pragian Stage. It is ...), some 416 to 359 million years ago. ''Tetanopsyrus lindoei'' Authority: Gagnier, Hanke and Wilson, 1999 Size: Length: 4 cm Remains: Holotype (UALVP 39078): articulated skeleton. Referred Materials: UALVP 32571, 38682, and 43026. Age and Distribution: Horizon: lower Devonian (Lochkovian). Locality: MOTH locality outcrop in the Mackenzie Mountains, western Northwest Territories, Canada. Classification: Acanthodii Diplacanthiiformes Tetanopsyridae ''Tetanopsyrus breviacanthias'' Authority: Hanke, Davis and Wilson, 2001 Size: Length: 4 cm Remains: (UALVP 43246): articulated skeleton Ref ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diplacanthidae
''Diplacanthus'' is an extinct genus of Mid to Late Devonian fish in the class Acanthodii, known as spiny sharks. Classification The genus was named by Louis Agassiz in 1843. It was formerly regarded as belonging to the Climatiformes but recently reassigned to the Diplacanthiformes, in which it is united with, amongst others, ''Rhadinacanthu''s, '' Uraniacanthus'', and '' Culmacanthus''. Diplacanthiforms were widespread during the Middle and early Late Devonian. They are best represented in the Middle Devonian, by articulated fossils, fin spines, and abundant scales, the latter particularly from northern Europe. In a latest revision of the genus ''Diplacanthus,'' a large number of species from Europe were synonymized with earlier Scottish species, and these too were redefined. D. ''crassisimus'' was taken to have precedence over D. ''striatus'' as the name of the type specimen. ''Diplacanthus longispinus'' was reassigned to ''Rhadinacanthus longispinus'', within which were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devonian Period
The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, where rocks from this period were first studied. The first significant adaptive radiation of life on dry land occurred during the Devonian. Free-sporing vascular plants began to spread across dry land, forming extensive forests which covered the continents. By the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared. The arthropod groups of myriapods, arachnids and hexapods also became well-established early in this period, after starting their expansion to land at least from the Ordovician period. Fish reached substantial diversity during this time, leading the Devonian to often be dubbed the Age of Fishes. The placoderms began dominating ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Order (biology)
Order ( la, wikt:ordo#Latin, ordo) is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between Family_(biology), family and Class_(biology), class. In biological classification, the order is a taxonomic rank used in the classification of organisms and recognized by the nomenclature codes. An immediately higher rank, superorder, is sometimes added directly above order, with suborder directly beneath order. An order can also be defined as a group of related families. What does and does not belong to each order is determined by a taxonomist, as is whether a particular order should be recognized at all. Often there is no exact agreement, with different taxonomists each taking a different position. There are no hard rules that a taxonomist needs to follow in describing or recognizing an order. Some taxa are accepted almost universally, while others are recognized only rarely. The name of an order is usually written with a capital letter. Fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
