lampshell
Học thuậtThân thiện
Definition
Noun A marine invertebrate animal belonging to the phylum Brachiopoda. It has a bivalve (two-part) shell and uses a specialized, coiled feeding organ called a lophophore, which bears tentacles for capturing food particles from the water. They are found worldwide, often in cold or deep waters.
Usage
The term "lampshell" is a common name used primarily in biological and paleontological contexts to describe these specific shelled animals. It refers to their physical resemblance to ancient Roman oil lamps.
Examples
- Fossil collectors often find well-preserved lampshells in sedimentary rock.
- The lampshell is a classic example of a "living fossil," as its basic form has changed little for hundreds of millions of years.
- Under the microscope, you can see the delicate tentacles of the lampshell's lophophore.
Advanced Usage
- In Paleontology: The term is frequently used when discussing the fossil record, as brachiopods like lampshells are abundant and important index fossils for dating rock layers.
- In Marine Biology: Used to distinguish brachiopods from bivalve mollusks (like clams and mussels), which they superficially resemble but are not closely related to.
Variants and Related Words
- Brachiopod (n): The formal scientific name for a lampshell.
- Lophophore (n): The coiled, tentacle-bearing arm used for feeding, which is the defining characteristic of lampshells and related animals.
Synonyms
- Brachiopod
Notes on Meaning
While "lampshell" and "brachiopod" are synonyms, "brachiopod" is the standard term in scientific literature. "Lampshell" is a descriptive common name that highlights the animal's shape.
Noun
- marine animal with bivalve shell having a pair of arms bearing tentacles for capturing food; found worldwide