heterocercal
/ˌhɛtəroʊˈsɜːrkəl/
adjective
- Describing a fish tail fin where the upper lobe is larger than the lower lobe and the spine extends into the upper lobe.
- The heterocercal shape of the sturgeon's tail is different from most bony fish.
- In biology class, we learned that a heterocercal fin is common in primitive fish.
- Sharks have a heterocercal tail that helps them swim efficiently.
Antonyms