A burrowing mollusc with a slender tusk-shaped shell, which is open at both ends and typically white, and a three-lobed foot.
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Class Scaphopoda, in particular the genus Dentalium
Example sentencesExamples
There are approximately 900 species of Scaphopoda, commonly called tusk shells.
The nervous system of mollusks varies greatly from group to group; the clams and tusk shells have very simple nervous systems, while the squids, octopuses and some other mollusks have concentrated complex nerve centers and eyes equivalent to vertebrates.
The phylum Mollusca also ‘includes lesser known forms such as the chitons, tusk shells, and solenogasters, among others’.
The Scaphopoda are a distinctive group of molluscs commonly known as the ‘tusk shells’ because their shells are conical and slightly curved to the dorsal side, making the shells look like tiny tusks.
In bivalves, chitons, tusk shells and some snails, sperm and eggs are released into the water and fertilisation is external.
Definition of tusk shell in US English:
tusk shell
noun
another term for tooth shell
Example sentencesExamples
In bivalves, chitons, tusk shells and some snails, sperm and eggs are released into the water and fertilisation is external.
The Scaphopoda are a distinctive group of molluscs commonly known as the ‘tusk shells’ because their shells are conical and slightly curved to the dorsal side, making the shells look like tiny tusks.
The nervous system of mollusks varies greatly from group to group; the clams and tusk shells have very simple nervous systems, while the squids, octopuses and some other mollusks have concentrated complex nerve centers and eyes equivalent to vertebrates.
There are approximately 900 species of Scaphopoda, commonly called tusk shells.
The phylum Mollusca also ‘includes lesser known forms such as the chitons, tusk shells, and solenogasters, among others’.