Tetrapod

Ancient fossils shed light on anatomical changes accompanying evolution of first land vertebrates

... developmental biologist Charles Kimmel, who was the first author on the paper. When they mapped the changes in bone length and width onto the tetrapod family tree, the researchers discovered that not all bones changed size at the same rate or in the same direction. This phenomenon can result in an ...

Genes Associated With Limb Development is More Primitive Than Believed

... them. Findings revealed that the activity pattern in the pectoral fins was very much similar to the genes responsible for the development of tetrapod limbs. Tetrapods have a second phase of Hox gene expression that happens later in development. During this second phase, hands and feet ...

Species Linking Fish And Land Animals Found

... transition. In a second paper in the journal, the scientists describe in depth how the pectoral fin of the fish serves as the origin of the tetrapod limb. Embedded in the fin of Tiktaalik are bones that compare to the upper arm, forearm and primitive parts of the hand of land-living animals. "Most ...

Tetrapod in Biological News

Darwin Symposium at Field Museum offers broad overview of his science and its impact

... will speak at the symposium about the origin of tetrapod limbs. A tetrapod is any vertebrate with four limbs (or four-limbed ... AM NEIL SHUBIN, The Field Museum: The Origin of tetrapod Limbs 12:10 2:00 PM Lunch Break 2:00 2:30 ...

Scientists find 245 million-year-old burrows of land vertebrates in Antarctica

... The work was funded by the National Science Foundation. Fossils of tetrapod bones from later in the Triassic period have been found in a section of ... an early mammal relative called Thrinaxodon. Burrows, some containing tetrapod bones, have previously been excavated in South Africa, which is considered ...

Closing the gap between fish and land animals

... between this animal and the earliest true tetrapods (animals with limbs rather than paired fins). Now, new fossils of the extremely primitive tetrapod Ventastega from the Devonian of Latvia cast light on this key phase of the transition. "Ventastega was first described from fragmentary material ...

Academy volunteer wins national paleontology award

... of some of the worlds earliest limbed vertebrates, called tetrapods. Among the fossils Rowe discovered at the Red Hill site are an ancient tetrapod that now bears his name, Densignathus rowei; several new species of ancient fishes; rare fossil millipedes and other arthropods; and new species of ...

Tetrapod in Biological Dictionary

Tetrapod

... "four-footed") are ... The universal tetrapod characteristics of front limbs that bend backward at the ... In coastal engineering, a tetrapod is a four-legged concrete structure used as armour unit on breakwaters. The tetrapod 's shape is designed to dissipate the force ...

Vertebrates

... no vertebrae, but are genetically quite closely related to ... ... article is about four-limbed vertebrates . For the structure, see tetrapod ... Scientists find 245 million-year-old burrows of land vertebrates in Antarctica ... Animated Science, Health, Technology, Math, Social ...

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