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- A dorsal fin is a fin on the back of most marine and freshwater vertebrates. Dorsal fins have evolved independently several times through convergent evolution adapting to marine environments, so the fins are not all homologous.Learn more:A dorsal fin is a fin on the back of most marine and freshwater vertebrates. Dorsal fins have evolved independently several times through convergent evolution adapting to marine environments, so the fins are not all homologous.en.wikipedia.org/wiki/Dorsal_finIt is known that dolphins evolved from semi-aquatic four-legged animals. In particular, dorsal fins evolved as 'convergent evolution'~. This occurs when two different organisms evolve similar characteristics independently. Such is the case with dolphins and sharks: they both have dorsal fins.www.reptileknowledge.com/reptile-pedia/how-did-d…
How did dolphins get their fins? - The Environmental Literacy …
2 days ago · The dorsal fin, that distinctive fin on the dolphin’s back, also serves an important purpose. Unlike the pectoral fins, which are modified limbs, the dorsal fin is thought to have …
evolution - How did dolphins acquire their dorsal fin?
May 22, 2020 · I had seen it before, but suddenly the dorsal fin startled me. How did this dorsal fin evolve? Is it some atavism from eons ago, a revived feature, …
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Adipose fin development and its relation to the evolutionary …
The dorsal, anal and caudal fins of vertebrates are proposed to have originated by the partitioning and transformation of the continuous median fin fold that is plesiomorphic to chordates. …
Understanding Shark Fins & Types (Dorsal Fin, Pectoral, Ventral, …
See more on sharksider.comShark fins have developed over 450 million years of evolution. The very first known shark, the Xenacanthus, more closely resembled an eel than a modern shark. The Xenacanthus had a ribbon like dorsal fin that ran down the length of it’s back and connected with its anal fin. Fast forward a hundred million years to the Cladosela…Evidence that mechanisms of fin development evolved …
Jul 26, 2006 · The first dorsal fin region was characterized by expression of Hoxd9 and Hoxd10, whereas the second dorsal and anal regions were distinguished by additional expression of Hoxd12 (Fig. 2a, b).
How did dolphins get their fins? - reptileknowledge.com
In the case of dolphins and killer whales, their streamlined bodies and dorsal fins help them move efficiently through water, providing stability and aiding in steering. This adaptation is thought to …
How fish fins evolved just before the transition to land
Dec 30, 2019 · Research on fossilized fish from the late Devonian period, roughly 375 million years ago, details the evolution of fins as they began to transition into limbs fit for walking on land.
Developmental independence of median fins from the larval fin …
May 7, 2022 · Here, we describe the transition from the larval fin fold into the median fins in zebrafish at the cellular and molecular developmental level. We demonstrate that reduction …
Lessons from the first dorsal fin in atheriniforms-A new mode of …
The pterygiophores of the first dorsal fin, including the interdorsal pterygiophores, develop from caudal to rostral, but the fin-spines of the first dorsal fin form in the opposite direction. This …
The origins of adipose fins: an analysis of homoplasy and the …
Adipose fins are appendages found on the dorsal midline between the dorsal and caudal fins in more than 6000 living species of teleost fishes. It has been consistently argued that adipose …
Scientists Discover Evolutionary Origin Of Fins, Limbs
Jul 26, 2006 · This midline -- think of the dorsal, tail and anal fins of a fish - is where the genetic template to produce fins originated, about 100 million years before paired fins evolved and …
Developmental constraints on fin diversity - Enny - 2020
May 12, 2020 · Unpaired fins, such as dorsal fins, may hold the key to reveal developmental constraints on the number of proximal radials in paired appendages. Unpaired fins typically …
Lessons from the first dorsal fin in atheriniforms—A new mode of …
Mar 29, 2017 · In this study, the development of anal and dorsal fins in atheriniforms is described and its consequences for the current phylogenetic hypothesis are discussed. Developmental …
Dorsal fin - Wikiwand
A dorsal fin is a fin on the back of most marine and freshwater vertebrates. Dorsal fins have evolved independently several times through convergent evolution adapting to marine …
Adipose fin development and its relation to the evolutionary …
Jan 24, 2019 · The dorsal, anal and caudal fins of vertebrates are proposed to have originated by the partitioning and transformation of the continuous median fin fold that is plesiomorphic to …
The evolutionary history of the development of the pelvic …
Diagram of the evolution of paired fins. (A) The evolution of paired fins from the ‘zone of competence’ (Freitas et al. 2006; Yonei-Tamura et al. 2008; Johanson, 2010). A dorsal zone of …
Evolution of median fin modules in the axial skeleton of fishes
Aug 15, 2002 · In acanthopterygians, a new first dorsal fin module evolved via duplication and divergence. The median fins provide an example of how basic modularity is maintained over …
Developmental independence of median fins from the larval fin …
The median fins of modern fish that show discrete forms (dorsal, anal, and caudal fins) are derived from a continuous fold-like structure, both in ontogeny and phylogeny. The median fin …
Developmental independence of median fins from the larval fin …
May 7, 2022 · Here, we describe the transition from the larval fin fold into the median fins in zebrafish at the cellular and molecular developmental level. We demonstrate that reduction …
Morphological evolution and diversity of pectoral fin skeletons in ...
D–F Dorsal (medial) view of pectoral fin skeleton of Engraulis japonicus (11 cm TL), focused on girdle components (E) and extremity components (F). G–I Dorsal (medial) view of pectoral fin …
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