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Acanthostega, the Glossary

Acanthostega (meaning "spiny roof") is an extinct genus of stem-tetrapod, among the first vertebrate animals to have recognizable limbs.^[1]

34 relations: Basal (phylogenetics), Coelacanth, Deciduous, Devonian, Erik Jarvik, Eusthenopteron, Exaptation, Famennian, Fish, Fossil, Greenland, Gunnar Säve-Söderbergh, Histology, Ichthyostega, Jenny Clack, Limb (anatomy), Morphology (biology), Multimodal distribution, Neoteny, Panderichthys, Parmastega, Pelagic zone, Polydactyly in stem-tetrapods, Sarcopterygii, Sexual dimorphism, Shoulder girdle, Stegocephali, Stem tetrapoda, Suture (anatomy), Synchrotron, Terrestrial animal, Tiktaalik, Vertebrate, Weight-bearing.
Devonian Greenland
Devonian sarcopterygians of North America
Fossil taxa described in 1952
Stegocephalians

Basal (phylogenetics)

In phylogenetics, basal is the direction of the base (or root) of a rooted phylogenetic tree or cladogram.

See Acanthostega and Basal (phylogenetics)

Coelacanth

Coelacanths (order Coelacanthiformes) are an ancient group of lobe-finned fish (Sarcopterygii) in the class Actinistia.

See Acanthostega and Coelacanth

In the fields of horticulture and botany, the term deciduous means "falling off at maturity" and "tending to fall off", in reference to trees and shrubs that seasonally shed leaves, usually in the autumn; to the shedding of petals, after flowering; and to the shedding of ripe fruit.

See Acanthostega and Deciduous

Devonian

The Devonian is a geologic period and system of the Paleozoic era during the Phanerozoic eon, spanning 60.3 million years from the end of the preceding Silurian period at million years ago (Ma), to the beginning of the succeeding Carboniferous period at Ma.

See Acanthostega and Devonian

Erik Jarvik

Anders Erik Vilhelm Jarvik (30 November 1907 – 11 January 1998) was a Swedish paleontologist who worked extensively on the sarcopterygian (or lobe-finned) fish Eusthenopteron.

See Acanthostega and Erik Jarvik

Eusthenopteron

Eusthenopteron (from εὖ, 'good', σθένος, 'strength', and πτερόν 'wing' or 'fin') is a genus of prehistoric sarcopterygian (often called "lobe-finned") fish known from several species that lived during the Late Devonian period, about 385 million years ago. Acanthostega and Eusthenopteron are Devonian sarcopterygians of North America, late Devonian sarcopterygians, prehistoric lobe-finned fish genera and Transitional fossils.

See Acanthostega and Eusthenopteron

Exaptation

Exaptation or co-option is a shift in the function of a trait during evolution.

See Acanthostega and Exaptation

Famennian

The Famennian is the later of two faunal stages in the Late Devonian epoch.

See Acanthostega and Famennian

Fish

A fish (fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits.

See Acanthostega and Fish

Fossil

A fossil (from Classical Latin) is any preserved remains, impression, or trace of any once-living thing from a past geological age.

See Acanthostega and Fossil

Greenland

Greenland (Kalaallit Nunaat,; Grønland) is a North American island autonomous territory of the Kingdom of Denmark.

See Acanthostega and Greenland

Gunnar Säve-Söderbergh

Gunnar Säve-Söderbergh (31 January 1910 – 8 June 1948) was a Swedish palaeontologist and geologist.

See Acanthostega and Gunnar Säve-Söderbergh

Histology

Histology, also known as microscopic anatomy or microanatomy, is the branch of biology that studies the microscopic anatomy of biological tissues.

See Acanthostega and Histology

Ichthyostega

Ichthyostega (from ἰχθῦς, 'fish' and στέγη, 'roof') is an extinct genus of limbed tetrapodomorphs from the Late Devonian of what is now Greenland. Acanthostega and Ichthyostega are Devonian sarcopterygians of North America, fossils of Greenland, late Devonian sarcopterygians, prehistoric lobe-finned fish genera, stegocephalians and Transitional fossils.

See Acanthostega and Ichthyostega

Jenny Clack

Jennifer Alice Clack, (née Agnew; 3 November 1947 – 26 March 2020) was an English palaeontologist and evolutionary biologist.

See Acanthostega and Jenny Clack

Limb (anatomy)

A limb (from Old English lim, meaning "body part") is a jointed, muscled appendage of a tetrapod vertebrate animal used for weight-bearing, terrestrial locomotion and physical interaction with other objects.

See Acanthostega and Limb (anatomy)

Morphology (biology)

Morphology in biology is the study of the form and structure of organisms and their specific structural features.

See Acanthostega and Morphology (biology)

Multimodal distribution

In statistics, a multimodal distribution is a probability distribution with more than one mode (i.e., more than one local peak of the distribution).

See Acanthostega and Multimodal distribution

Neoteny

Neoteny, also called juvenilization,Montagu, A. (1989).

See Acanthostega and Neoteny

Panderichthys

Panderichthys is a genus of extinct sarcopterygian (lobe-finned fish) from the late Devonian period, about 380 Mya. Acanthostega and Panderichthys are late Devonian sarcopterygians, prehistoric lobe-finned fish genera and Transitional fossils.

See Acanthostega and Panderichthys

Parmastega

Parmastega is an extinct genus of stem tetrapod from the Devonian, dated to the earliest Famennian age (about 372 million years ago), in contrast to later fossils known from late Famennian (365–359 million years ago). Acanthostega and Parmastega are late Devonian sarcopterygians, prehistoric lobe-finned fish genera, stegocephalians and Transitional fossils.

See Acanthostega and Parmastega

Pelagic zone

The pelagic zone consists of the water column of the open ocean and can be further divided into regions by depth.

See Acanthostega and Pelagic zone

Polydactyly in stem-tetrapods

Polydactyly in stem-tetrapods should here be understood as having more than five digits to the finger or foot, a condition that was the natural state of affairs in the earliest stegocephalians during the evolution of terrestriality.

See Acanthostega and Polydactyly in stem-tetrapods

Sarcopterygii

Sarcopterygii — sometimes considered synonymous with Crossopterygii — is a clade (traditionally a class or subclass) including both a group of bony fish commonly referred to as lobe-finned fish, and tetrapods.

See Acanthostega and Sarcopterygii

Sexual dimorphism

Sexual dimorphism is the condition where sexes of the same species exhibit different morphological characteristics, particularly characteristics not directly involved in reproduction.

See Acanthostega and Sexual dimorphism

Shoulder girdle

The shoulder girdle or pectoral girdle is the set of bones in the appendicular skeleton which connects to the arm on each side.

See Acanthostega and Shoulder girdle

Stegocephali

Stegocephali (often spelled Stegocephalia, from Greek στεγοκεφαλια, lit. "roofed head") is a clade of vertebrate animals containing all fully limbed tetrapodomorphs. Acanthostega and Stegocephali are stegocephalians.

See Acanthostega and Stegocephali

Stem tetrapoda

The Stem Tetrapoda are a cladistically defined group, consisting of all animals more closely related to extant four-legged vertebrates than to their closest extant relatives (the lungfish), but excluding the crown group Tetrapoda.

See Acanthostega and Stem tetrapoda

Suture (anatomy)

In anatomy, a suture is a fairly rigid joint between two or more hard elements of an organism, with or without significant overlap of the elements.

See Acanthostega and Suture (anatomy)

Synchrotron

A synchrotron is a particular type of cyclic particle accelerator, descended from the cyclotron, in which the accelerating particle beam travels around a fixed closed-loop path.

See Acanthostega and Synchrotron

Terrestrial animal

Terrestrial animals are animals that live predominantly or entirely on land (e.g. cats, chickens, ants, spiders), as compared with aquatic animals, which live predominantly or entirely in the water (e.g. fish, lobsters, octopuses), and semiaquatic animals, which rely on both aquatic and terrestrial habitats (e.g.

See Acanthostega and Terrestrial animal

Tiktaalik

Tiktaalik (Inuktitut ᑎᒃᑖᓕᒃ) is a monospecific genus of extinct sarcopterygian (lobe-finned fish) from the Late Devonian Period, about 375 Mya (million years ago), having many features akin to those of tetrapods (four-legged animals). Acanthostega and Tiktaalik are Devonian sarcopterygians of North America, late Devonian sarcopterygians, prehistoric lobe-finned fish genera and Transitional fossils.

See Acanthostega and Tiktaalik

Vertebrate

Vertebrates are deuterostomal animals with bony or cartilaginous axial endoskeleton — known as the vertebral column, spine or backbone — around and along the spinal cord, including all fish, amphibians, reptiles, birds and mammals.

See Acanthostega and Vertebrate

Weight-bearing

In orthopedics, weight-bearing is the amount of weight a patient puts on an injured body part.

See Acanthostega and Weight-bearing

References

[1] https://en.wikipedia.org/wiki/Acanthostega

Also known as Acanthostega gunnari, Acanthostegidae.

Acanthostega, the Glossary

Table of Contents

See also

Devonian Greenland

Devonian sarcopterygians of North America

Fossil taxa described in 1952

Stegocephalians

References