tooth shell
Học thuậtThân thiện
Definition
Noun A marine mollusk belonging to the class Scaphopoda, characterized by a long, slender, tubular, and slightly curved shell that is open at both ends. The animal has a pointed foot used for burrowing into soft seabed sediments.
Usage
The term "tooth shell" is used to refer to the animal itself or its distinctive shell. It is a common name based on the shell's resemblance to a mammalian tooth (specifically an elephant's tusk or a canine tooth).
Examples
- The beachcomber found a delicate tooth shell washed up on the sand.
- Under the microscope, the structure of the tooth shell was clearly visible.
- Tooth shells are not commonly seen because they live buried in the ocean floor.
Advanced Usage
- The term is often used in malacology (the study of mollusks) and by shell collectors.
- In some contexts, "tooth shell" can be used metaphorically to describe any small, pointed, conical object due to its shape.
Variants and Related Words
- Tusk shell: This is a direct synonym and the more common modern term for "tooth shell."
- Scaphopod: The scientific name for any member of the class Scaphopoda, which includes all tooth/tusk shells.
Synonyms
- Tusk shell
Notes
- The "tooth shell" is not related to the teeth of vertebrates. The name is purely descriptive of its shape.
- It is a specific common name for scaphopods and should not be confused with fragments of actual teeth or other shell types.
Noun
- any of various seashore mollusks having a tapering tubular shell open at each end and a foot pointed like a spade for burrowing