lobe-finned fish
Noun: A type of bony fish characterized by fleshy, lobed fins containing bones and muscles arranged in a pattern similar to the limbs of land vertebrates. These fish are of great evolutionary significance as the closest fish relatives to tetrapods (four-limbed vertebrates). Most species are known only from fossils, though a few, like the coelacanth, are living fossils.
The term is used in scientific and evolutionary biology contexts to describe this specific group of fish and discuss their anatomical features and evolutionary role. * The lobe-finned fish is a key subject in the study of vertebrate evolution. * Scientists study the fossilized remains of a lobe-finned fish to understand the transition from water to land.
- The discovery of a living coelacanth, a type of lobe-finned fish, was a major zoological surprise.
- The pectoral fin of a lobe-finned fish has a skeletal structure that resembles a primitive arm.
- Lobe-finned fish represent an ancient lineage that gave rise to all terrestrial vertebrates.
- Evolutionary Context: The term is central to discussions about the origin of tetrapods. The phrase "the lobe-finned fish lineage" is commonly used.
- Anatomical Description: Used to highlight specific features, e.g., "the robust, muscular fins of lobe-finned fish."
- Crossopterygian (n): The formal taxonomic name for lobe-finned fish, often used synonymously in scientific literature.
- Sarcopterygian (n): A broader modern taxonomic class (Sarcopterygii) that includes lobe-finned fish and their tetrapod descendants.
- Coelacanth (n): A well-known genus of living lobe-finned fish.
- Lungfish (n): Another group of air-breathing fish within the Sarcopterygii, closely related to lobe-finned fish and tetrapods.
- Crossopterygian (scientific synonym)
- Sarcopterygian (in a broader modern taxonomic sense)
This term has a single, specific zoological meaning. It does not have common idiomatic or figurative uses outside of scientific discourse.
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any fish of the order Crossopterygii; most known only in fossil form
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