six-gilled shark
Học thuậtThân thiện
Definition
Noun: 1. A large, primitive shark widely distributed in warm seas: This term refers specifically to a member of the family Hexanchidae, characterized by having six gill slits, unlike most sharks which have five. It is considered a more primitive species within the shark lineage.
Usage
- The term "six-gilled shark" is a common name used to identify sharks belonging to the genera (e.g., the bluntnose sixgill shark) or (e.g., the broadnose sevengill shark, though note: 'sevengill' is a different species). It is used in marine biology, fishing, and general descriptions of elasmobranch fish.
- It functions as a countable noun (e.g., , ).
Examples
- Noun:
- The divers were thrilled to encounter a six-gilled shark near the canyon wall.
- The six-gilled shark is often found in deep, temperate, and tropical waters worldwide.
- Researchers are studying the feeding habits of the six-gilled shark.
Advanced Usage
- "Bluntnose six-gilled shark": A more precise common name for , the most widely known species.
- The bluntnose six-gilled shark is one of the largest carnivorous fish on the continental shelf.
Variants and Related Words
- Hexanchid (n): The technical, scientific term for any shark in the family Hexanchidae, which includes six-gilled and seven-gilled sharks.
- Hexanchids are sometimes called "cow sharks."
- Cow shark (n): Another common name for sharks in the family Hexanchidae.
- The cow shark is easily identified by its extra gill slit.
Synonyms
- Bluntnose sixgill shark (n): A specific synonym for the most common species ().
- Hexanchus (n): The genus name, often used in scientific contexts.
Related Phrases
- Deep-sea shark: A descriptive phrase that often applies to the six-gilled shark due to its common habitat.
- Many deep-sea sharks, like the six-gilled shark, are rarely seen by humans.
Noun
- large primitive shark widely distributed in warm seas