| Tetanopsyrus Temporal range: | |
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| Family: | Tetanopsyridae Gagnier et al., 1999 |
| Genus: | Tetanopsyrus Gagnier et al., 1999 |
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Tetanopsyrus is a genus of Acanthodii. [1] [2] There are two species of this genus that lived through the lower Devonian (Lochkovian), some 416 to 359 million years ago.
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
Authority: Hanke, Davis and Wilson, 2001
Size: Length: 4 cm
Remains: (UALVP 43246): articulated skeleton
Referred Materials: UALVP 39062 (partial); UALVP 42512; UALVP 43089 (juvenile); UALVP 44030 (juvenile); UALVP 45153
Age and Distribution: Horizon: lower Devonian (Lochkovian)
Locality: MOTH locality outcrop in the Mackenzie Mountains, western Northwest Territories, Canada.
Classification: Acanthodii Diplacanthiiformes Tetanopsyridae
Chondrichthyes is a class of jawed fish that contains the cartilaginous fish or chondrichthyans, which all have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or bony fish, which have skeletons primarily composed of bone tissue. Chondrichthyes are aquatic vertebrates with paired fins, paired nares, placoid scales, conus arteriosus in the heart, and a lack of opercula and swim bladders. Within the infraphylum Gnathostomata, cartilaginous fishes are distinct from all other jawed vertebrates.
Acanthodii or acanthodians is an extinct class of gnathostomes. They are currently considered to represent a paraphyletic grade of various fish lineages basal to extant Chondrichthyes, which includes living sharks, rays, and chimaeras. Acanthodians possess a mosaic of features shared with both osteichthyans and chondrichthyans. In general body shape, they were similar to modern sharks, but their epidermis was covered with tiny rhomboid platelets like the scales of holosteians.
The Mackenzie Mountains are a Canadian mountain range forming part of the Yukon-Northwest Territories boundary between the Liard and Peel rivers. The range is named in honour of Canada's second prime minister, Alexander Mackenzie. Nahanni National Park Reserve and Nááts'ihch'oh National Park Reserve are in the Mackenzie Mountains.
Hyneria is a genus of large prehistoric predatory lobe-finned fish which lived in fresh water during the Famennian stage of the Devonian period.
Varanops is an extinct genus of Early Permian varanopid known from Texas and Oklahoma of the United States. It was first named by Samuel Wendell Williston in 1911 as a second species of Varanosaurus, Varanosaurus brevirostris. In 1914, Samuel W. Williston reassigned it to its own genus and the type species is Varanops brevirostris.
Tristichopterids (Tristichopteridae) were a diverse and successful group of fish-like tetrapodomorphs living throughout the Middle and Late Devonian. They first appeared in the Eifelian stage of the Middle Devonian. Within the group sizes ranged from a few tens of centimeters (Tristichopterus) to several meters.
Psarolepis is a genus of extinct bony fish which lived around 397 to 418 million years ago. Fossils of Psarolepis have been found mainly in South China and described by paleontologist Xiaobo Yu in 1998. It is not known certainly in which group Psarolepis belongs, but paleontologists agree that it probably is a basal genus and seems to be close to the common ancestor of lobe-finned and ray-finned fishes. In 2001, paleontologist John A. Long compared Psarolepis with onychodontiform fishes and refer to their relationships.
Terminonatator is a genus of elasmosaurid plesiosaur from the Late Cretaceous of Saskatchewan, Canada. It is known from a skull and partial skeleton from a young adult, found in the Campanian-age Bearpaw Formation near Notukeu Creek in Ponteix. Terminonatator is currently one of the youngest plesiosaurs from the Western Interior Seaway.
Onychodus is a genus of prehistoric lobe-finned fish which lived during the Devonian Period. It is one of the best known of the group of onychodontiform fishes. Scattered fossil teeth of Onychodus were first described from Ohio in 1857 by John Strong Newberry. Other species were found in Australia, England, Norway and Germany showing that it had a widespread range.
Maiaspondylus is an extinct genus of platypterygiine ophthalmosaurid ichthyosaurs known from Northwest Territories of Canada, the Cambridge Greensand of England and the Voronezh Region of Russia.
Superciliaspis is an extinct genus of jawless fish which existed in what is now the Northwest Territories of Canada during the Lochkovian age. Originally identified as a species of Cephalaspis by Dineley and Loeffler in 1976, it was reassigned to Superciliaspis gabrielsi by Adrain and Wilson in 1994.
Whatcheeria is an extinct genus of early tetrapod from the Mississippian of Iowa. Fossils have been found in 340 million year old fissure fill deposits in the town of Delta. The type species, Whatcheeria deltae was named in 1995. It is classified within the family Whatcheeriidae, along with the closely related Pederpes and possibly Ossinodus.
Brochoadmones is an extinct genus of acanthodian from the Devonian of what is now Canada. It is the only genus in the suborder Brochoadmonoidei, whose relationship to other acanthodian orders remains currently in flux.
Gyracanthides is an extinct genus of acanthodian gnathostome, known from Devonian to Early Carboniferous.
Ptomacanthus is an extinct genus of spiny shark, an early relative of living cartilaginous fishes.
Diplacanthiformes is an order of "acanthodian" stem-chondrichthyans which lived during the Devonian Period.
Acanthodiformes is an order of acanthodian fishes which lived from the Early Devonian to Early Permian.
Tiiu Märss is an Estonian geologist and palaeoichthyologist.
Xylacanthus is a genus of extinct acanthodian fish belonging to the family Ischnacanthidae. It lived during the Silurian to Devonian periods. Three species of Xylacanthus are known, X. kenstewarti from Late Wenlock to Early Ludlow from the Mackenzie Mountains in Canada, X. minutus from Lochkovian of Spitsbergen in Norway, and X. grandis from Siegenian of Spitsbergen. X. grandis was the largest acanthodian with 35 cm (14 in) long jaw bone and estimated total length of 2.5 m.
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