lobefin
Definition
Noun: A type of bony fish belonging to the order Crossopterygii, characterized by fleshy, lobe-shaped fins. Most species in this group are known only from fossils, though a few living representatives, such as the coelacanth, exist.
Examples
- Scientists study the fossilized lobefin to understand the evolution of vertebrates.
- The discovery of a living lobefin, the coelacanth, was a major zoological surprise.
- The lobefin's unique fin structure is considered a precursor to the limbs of land animals.
Advanced Usage
- Evolutionary Context: The term is primarily used in paleontology and evolutionary biology. It describes a crucial transitional form in the fossil record, illustrating the move from aquatic to terrestrial life.
- The lobefin represents a key stage in the evolution of tetrapods.
Variants and Related Words
- Crossopterygian (noun): The formal, scientific synonym for lobefin.
- Sarcopterygian (noun): In modern classification, the broader clade (Sarcopterygii) that includes lobe-finned fishes and their tetrapod descendants. "Lobefin" is a common name for fish within this group.
- Coelacanth (noun): A well-known genus of living lobefin.
Synonyms
- Crossopterygian
- Lobe-finned fish (This is a compound form and should be considered a descriptive phrase rather than a single-word synonym for the target term "lobefin").
Different Meanings
The word "lobefin" has only one specific zoological meaning. It does not have common idiomatic or figurative uses.
Noun
-
any fish of the order Crossopterygii; most known only in fossil form
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