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Extinct genus of tetrapodomorphs
Acanthostega, from Ancient Greek ἄκανθα (ákantha), meaning "spine", and στέγη (stégē), meaning "roof", is an extinct genus of stem-tetrapod, among the
Acanthostega
Clade of the first four-limbed vertebrates and their descendants
evolved in the Devonian, including the Late Devonian-age Ichthyostega and Acanthostega, as well as the trackmakers of the Middle Devonian-age Zachelmie trackways
Tetrapod
Extinct genus of tetrapodomorphs
fin was not as deep as in Acanthostega, and would have been less useful for swimming. Ichthyostega is related to Acanthostega gunnari, which is also from
Ichthyostega
Extinct genus of tetrapodomorphs
most widely known fossils of the fish-tetrapod transition, along with Acanthostega and Ichthyostega from Greenland. In 2004, three fossilized Tiktaalik
Tiktaalik
Clade of tetrapodomorphs
group, the earliest limbed tetrapodomorphs such as Ichthyostega and Acanthostega, which evolved in the Devonian period long before the origin of the crown
Stegocephali
Extinct genus of tetrapodomorphs
Ventastega is more primitive than other Devonian tetrapodomorphs including Acanthostega and Ichthyostega, and helps further understanding of the fish-tetrapod
Ventastega
defining changes on the basis of anatomy of Ichthyostega, Tulerpeton, and Acanthostega. In the cranium, there is a stapes derived from the hyomandibular of
Skeletal changes of vertebrates transitioning from water to land
Skeletal_changes_of_vertebrates_transitioning_from_water_to_land
Paraphyletic group of tetrapodomorphs
the transition to the Carboniferous. Ichthyostegalia Acanthostegidae Acanthostega Crassigyrinidae Crassigyrinus Densignathidae Densignathus Elginerpetontidae
Ichthyostegalia
Extinct genus of tetrapodomorphs
in the Tula Region of Russia at a site named Andreyevka. This genus, Acanthostega, and Ichthyostega represent the earliest tetrapods. Tulerpeton is considered
Tulerpeton
Clade of vertebrates
Elpistostegalia †Panderichthys †Tiktaalik †Elpistostege †Elginerpeton †Ventastega †Acanthostega †Ichthyostega †Whatcheeriidae †Colosteidae †Crassigyrinus †Baphetidae
Tetrapodomorpha
State of having more than five digits in ancient fish and tetrapods
upstream of the coding sequence of Shh." Devonian taxa were polydactylous. Acanthostega had eight digits on both the hindlimbs and forelimbs. Ichthyostega, which
Polydactyly_in_stem-tetrapods
Clade of tetrapodomorphs
Panderichthys Tiktaalik Elpistostege Stegocephali Elginerpeton Ventastega Acanthostega Ichthyostega Whatcheeriidae Colosteidae Crassigyrinus Baphetidae Tetrapoda
Elpistostegalia
Evolution of tetrapods to live on land
the species that existed during this transition, such as Tiktaalik and Acanthostega. Many of these species were also the first to develop adaptations suited
Vertebrate_land_invasion
Subphylum of chordates
doi:10.1038/nature12645. PMID 24132236. Benton, Michael J. (2019). "Acanthostega". Vertebrate Palaeontology (Kindle ed.). Wiley. p. 90. Encyclopædia Britannica
Vertebrate
Extinct genus of tetrapodomorphs
known from several of the earliest four-limbed vertebrates, such as Acanthostega, Ichthyostega, and baphetids. Further back, what seems to be a pair of
Deltaherpeton
to one that was deeper. However, in 1987, nearly complete fossils of Acanthostega from about 363 Ma showed that this Late Devonian transitional animal
History_of_life
Extinct genus of tetrapodomorphs
compared to other Devonian limbed vertebrates such as Ichthyostega and Acanthostega. The cleithrum (upper blade of the shoulder) is fused to the scapulocoracoid
Hynerpeton
Autonomous territory of Denmark
Greenland is specially rich, with some of the early tetrapods such as the Acanthostega and Ichthyostega from the Devonian and unique Triassic animals such as
Greenland
Extinct genus of tetrapodomorphs
Eusthenopteron Tristichopterus Panderichthys Tiktaalik Ichthyostega Acanthostega Tetrapoda Lu et al. (2019) Tungsenia Kenichthys Osteolepis Gyroptchius
Tungsenia
Extinct genus of tetrapodomorphs
skull roofing bones with stem tetrapoda forms such as Ichthyostega and Acanthostega. Eusthenopteron, like other tetrapodomorph fishes, had internal nostrils
Eusthenopteron
Clade of tetrapodomorphs
Elpistostegalia Panderichthys Tiktaalik Elpistostege Elginerpeton Ventastega Acanthostega Ichthyostega Whatcheeriidae Colosteidae Crassigyrinus Baphetidae Tetrapoda
Eotetrapodiformes
Extinct family of tetrapodomorphs
Panderichthys Stegocephalia Elpistostege Tiktaalik Elginerpeton Ventastega Acanthostega Ichthyostega Whatcheeriidae Colosteidae Crassigyrinus Baphetidae Crown
Colosteidae
Protective covering of the ventral area of a vertebrate
ventral scales found in animals like rhipidistians, labyrinthodonts, and Acanthostega, Similar, but not homologous cartilagenous elements, are found in the
Gastralia
"These possibly transitional fossils have been much studied, among them Acanthostega, which seems to have been wholly aquatic, and Ichthyostega" Richard Dawkins
Timeline_of_human_evolution
Arrangement of digits on hands and feet
polydactyly. Polydactyly in early tetrapod aquatic animals, such as in Acanthostega gunnari (Jarvik 1952), one of an increasing number of genera of stem-tetrapods
Dactyly
Extinct genus of tetrapodomorphs
Tristichopteridae Rhizodontida Hongyu Panderichthys Elpistostege Tiktaalik Acanthostega Ichthyostega Zhu et al. (2017) Youngolepis Diabolepis Powichthys Porolepis
Hongyu
Evolution of four legged vertebrates and their derivatives
colleagues showed that the very earliest tetrapods, animals similar to Acanthostega, were wholly aquatic and quite unsuited to life on land. This is in contrast
Evolution_of_tetrapods
Extinct genus of tetrapodomorphs
the humeral surfaces are very similar to those seen in Ichthyostega, Acanthostega, and lobe-finned fishes like Eusthenopteron. The hindlimbs were much
Crassigyrinus
Evolution of fish
to one that was deeper. However, in 1987, nearly complete fossils of Acanthostega from about 363 Ma showed that this Late Devonian transitional animal
Timeline_of_fish_evolution
(ákantha). Meaning: spine, thorn. Examples: Acanthodes ('spiny base'); Acanthostega ('spine roof'); coelacanth ('hollow spine'); Acrocanthosaurus ('high-spined
List of commonly used taxonomic affixes
List_of_commonly_used_taxonomic_affixes
Extinct species of tetrapodomorph
Elpistostegalia Panderichthys Tiktaalik Elpistostege Elginerpeton Ventastega Acanthostega Ichthyostega Whatcheeriidae Colosteidae Crassigyrinus Baphetidae Tetrapoda
Tinirau_clackae
Paraphyletic group of tetrapodomorphs
vegetation would have lowered oxygen content. The earliest forms, such as Acanthostega, had vertebrae and limbs quite unsuited to life on land. This is in contrast
Labyrinthodontia
Extinct genus of tetrapodomorphs
between fish and the earliest tetrapods, like Tiktaalik, Ichthyostega and Acanthostega. Before Livoniana there was Elginerpeton and Obruchevichthys. Four legs
Livoniana
Extinct genus of tetrapodomorphs
Jennifer A.; Rayfield, Emily J. (2014-04-22). "Feeding biomechanics in Acanthostega and across the fish–tetrapod transition". Proc. R. Soc. B. 281 (1781)
Elginerpeton
Extinct genus of fishes
Gogonasus Osteolepis Koharalepis Koharalepis Carbonichtys Panderichthys Acanthostega Megalichthyidae Ectosteorhachis Palatinichthys Cladarosymblema Sengoerichthys
Palatinichthys
Extinct genus of tetrapodomorphs
Stegocephalia Tiktaalik Elpistostege Stegocephali Elginerpeton Ventastega Acanthostega Ichthyostega Whatcheeriidae Colosteidae Crassigyrinus Baphetidae Crown
Elpistostege
Paraphyletic group of tetrapodomorphs
Mandageria Cabonnichthys Platycephalichthys Jarvikina Eusthenopteron Tristichopterus Panderichthys Tetrapoda Acanthostega Ichthyostega Osteolepiformes
Osteolepiformes
Extinct family of tetrapodomorphs
Panderichthys Stegocephalia Tiktaalik Elpistostege Elginerpeton Ventastega Acanthostega Ichthyostega Whatcheeriidae Colosteidae Crassigyrinus Baphetidae Crown
Whatcheeriidae
Taxonomic group
Ichthyostegalia, the primarily aquatic primitive labyrinthodonts such as Acanthostega, Ichthyostega, Tulerpeton, and probably loxommatids. Both Ichthyostegalia
Stem_tetrapoda
Extinct genus of tetrapodomorphs
the elpistostegalian fishes (like Tiktaalik) and early tetrapods (e.g. Acanthostega). Secondly, after preparation of its pectoral fins, the internal limb
Gogonasus
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Marsdenichthys
Extinct genus of tetrapodomorphs
loomesi Morphology of ?Sauripteris, Gooloogongia, Panderichthys and Acanthostega Reconstruction of Gooloogongia loomesi Archived 2008-08-24 at the Wayback
Gooloogongia
Extinct genus of tetrapodomorphs
Greenland. Of the two other genera of stem tetrapods from Greenland, Acanthostega and Ichthyostega, Ymeria is most closely related to Ichthyostega, though
Ymeria
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Canowindra_grossi
Genus of the first four-limbed vertebrates and their descendants
are prominent ridges that are found in early tetrapods. Likewise with Acanthostega, Pederpes, and Ichthyostega, the radii are shorter and less waisted.
Ossinodus
Clade of reptile-like animals
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Reptiliomorpha
Extinct species of tetrapodomorph
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Occidens_portlocki
0.CO;2-B. ISSN 0362-2525. PMID 10861830. Clack, J. A. (1994-04-19). "Acanthostega gunnari, a Devonian tetrapod from Greenland; the snout, palate and ventral
Septomaxilla
Extinct order of amphibians
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Nectridea
Foreleg, or upper limb in bipeds
natural state of affairs in the very first tetrapods. Early groups like Acanthostega had eight digits, while the more derived Ichthyostega had seven digits
Forelimb
Extinct genus of tetrapods
contact between its constituent bones, similar to the Devonian tetrapod Acanthostega. The rear of the skull was replete with interdigitating sutures between
Whatcheeria
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Gaiasia
Extinct order of tetrapods
Tetrapodomorpha Acanthostega Ichthyostega Tulerpeton Colosteidae Crassigyrinus Whatcheeriidae Baphetidae Crown Tetrapoda Eucritta Temnospondyli Lissamphibia
Temnospondyli
controversial designation, this term is not used on this list. Abiadisaurus Acanthostega Acerastia Acherontiscus Acroplous Actinodon Actiobates Adamanterpeton
List of prehistoric amphibian genera
List_of_prehistoric_amphibian_genera
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Tristichopterus
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Kenichthys
Paleontological discovery in Poland
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Zachelmie_trackways
Genus of early tetrapod
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Tanyka
Gap in the tetrapod fossil record
Crassigyrinus 14: Whatcheeriidae 15: Adelogyrinidae 16: Ventastega 17: Ichthyostega 18: Acanthostega 19: Tulerpeton References: Smithson et al. (2012) v t e
Romer's_gap
Extinct order of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Rhizodontida
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Sillerpeton
English paleontologist and biologist (1947–2020)
Devonian tetrapods Acanthostega and Ichthyostega, following up on field notes of researchers who had collected material of Acanthostega in 1970. Additional
Jenny_Clack
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Mahalalepis
Clade of lobe-finned fish
could take it onto land; Early tetrapods in weed-filled swamps, such as: Acanthostega, which had feet with eight digits, Ichthyostega with limbs. Descendants
Sarcopterygii
2001 documentary series produced by PBS
of tetrapods. Jenny Clack discusses her discovery of Ichthyostega and Acanthostega. Simon Conway Morris discusses the Cambrian explosion and Charles Doolittle
Evolution_(TV_series)
& Pierce (2026) compare limb functions of musculoskeletal models of Acanthostega and Pederpes and an extant salamander and lizard, and report that hip
2026_in_paleontology
Extinct order of reptiles
earlier stem tetrapods from the Devonian period, such as Ichthyostega and Acanthostega. SSTM 5025 possessed seven digits on the forelimbs and six on the hindlimbs
Hupehsuchia
Type of fossilized remains
known from fossils 380 million years old, and early tetrapods such as Acanthostega and Ichthyostega, known from fossils about 365 million years old. Its
Transitional_fossil
Extinct genus of tetrapodomorphs
using a labyrinth organ in a similar fashion. Tiktaalik Ichthyostega Acanthostega Beznosov, Pavel A.; Clack, Jennifer A.; Lukševičs, Ervīns; Ruta, Marcello;
Parmastega
Extinct genus of amphibians
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Proterogyrinus
Clade of amphibians
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Batrachomorpha
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Rhizodus
Subclass of amphibians
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Lissamphibia
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Panderichthys
Extinct family of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Gephyrostegidae
Ability of animals to travel on land
have fused digits, giving them less, and some early fishapods had more; Acanthostega had eight toes. Only ichthyosaurs evolved more than 5 digits within tetrapods
Terrestrial_locomotion
Japanese TV series or program
included: Eusthenopteron, Dunkleosteus (identified as a placoderm), Acanthostega, Hyneria, Pederpes, Dinocephalian, Gorgonops, Diictodon (fossil), and
Miracle_Planet
Fishapods and amphibians of the geological period
Genus Status Age Location Description Images Acanthostega Valid Famennian Greenland 0.6 m long Densignathus Valid Famennian United States Elginerpeton
List_of_Devonian_tetrapods
2009 book by Richard Dawkins
both fish and amphibians. There was a gap between Panderichthys and Acanthostega; it was filled by Neil Shubin and Ted Daeschler's discovery of Tiktaalik
The Greatest Show on Earth: The Evidence for Evolution
The_Greatest_Show_on_Earth:_The_Evidence_for_Evolution
Extinct genus of tetrapodomorphs from the Devonian
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Hyneria
suggested to be a transitional species between fish and tetrapods. 365 Ma Acanthostega is one of the earliest vertebrates capable of walking. 363 Ma By the
Timeline_of_life
Polyphyletic group of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Lepospondyli
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Carbonoherpeton
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Pholiderpeton
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Anthracosaurus
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Colosteus
Extinct genus of tetrapodomorphs
jaw. The Brittagnathus holotype, NHMD 116368, was discovered from the Acanthostega bonebed in the Britta Dal Formation. It is the fourth named genus of
Brittagnathus
Extinct family of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Canowindridae
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Eoherpeton
Extinct genus of tetrapodomorphs
Eusthenopteron Panderichthys Qikiqtania Tiktaalik Elpistostege Acanthostega Ichthyostega
Qikiqtania
the east coast, from Paleozoic to Holocene, from which the Devonian Acanthostega and Ichthyostega are examples of international relevance. The Late Triassic
Geology_of_Greenland
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Koharalepis
Rib in the tail of a vertebrate
region. Caudal ribs first appear in Tiktaalik and early tetrapods such as Acanthostega and Ichthyostega. Romer, Alfred Sherwood (1956). Osteology of the Reptiles
Caudal_rib
Extinct genus of reptile-like amphibians
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Gephyrostegus
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Barameda
Extinct family of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Tristichopteridae
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Sauripterus
Extinct genus of tetrapodomorphs
lato) see below↓ Stegocephali (Tetrapoda sensu lato) Devonian taxa †Acanthostega †Brittagnathus †Densignathus †Elpistostege? †Hynerpeton †Ichthyostega
Obruchevichthys
Extinct genus of vertebrates
to that and reviewed phylogeny again, resulted it would be closer to Acanthostega instead. The 2024 study, using braincase data, ruled out the tetrapod
Palaeospondylus
1997 video game
species of prehistoric amphibian—e.g. Ichthyostega, Tulerpeton, and Acanthostega. Gradually, if the player monitors the species' progress and moves them
Evolution: The Game of Intelligent Life
Evolution:_The_Game_of_Intelligent_Life
ACANTHOSTEGA
ACANTHOSTEGA
ACANTHOSTEGA
ACANTHOSTEGA
Boy/Male
English, Modern, Nepali
God Gift; Giver; Controller
Boy/Male
Biblical
Searching out.
Male
Egyptian
, a form of Ra as a god of war.
Girl/Female
Tamil
Girl/Female
Arabic
A Bird.
Girl/Female
Irish
Dark.
Boy/Male
Indian, Punjabi, Sikh
Family of God
Boy/Male
English Latin French
Right-hand son. Also a.
Biblical
wolf
Girl/Female
Indian, Marathi
Siddhi
ACANTHOSTEGA
ACANTHOSTEGA
ACANTHOSTEGA
ACANTHOSTEGA
ACANTHOSTEGA