Vermetus triquetrus | |
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Species: | V. triquetrus |
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Vermetus triquetrus Bivona-Bernardi, 1832 | |
Vermetus triquetrus is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells. [1]
The genus Vermetus is very ancient. It is known in the fossil records from the Jurassic to the Quaternary (age range: from 164.7 to 0.0 million years ago). [2]
These sea snails are characterized by an unusual appearance and lifecycle. The very young snails do not differ from other snails, as they have a conical, spiral shell. Later they fasten to a hard substrate using calcareous secretions, and the shell starts to take the form of an irregular tube. The length of the adult shell is about 30–50 millimetres (1.2–2.0 in) and the cross section of the shell can reach up to 6 mm in diameter. The small operculum is concave. This is a sessile gastropod the shell of which is cemented to the substrate. [3] [4]
Vermetus triquetrus is widespread in the Mediterranean Sea and in the North Atlantic Ocean. This species inhabits the coastal waters. [3] [5]
The Vermetidae, the worm snails or worm shells, are a taxonomic family of small to medium-sized sea snails, marine gastropod molluscs in the clade Littorinimorpha. The shells of species in the family Vermetidae are extremely irregular, and do not resemble the average snail shell, hence the common name "worm shells" or "worm snails".
Fusiturris undatiruga, common name the wrinkled turrid, is a species of sea snail, a marine gastropod mollusk in the family Fusiturridae.
Granulina marginata is a species of very small sea snail, a marine gastropod mollusk or micromollusk in the family Granulinidae.
Bivonia triquetra is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.
Dendropoma anguliferum is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.
Dendropoma petraeum is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.
Eualetes tulipa is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.
Vermetus adansonii is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.
Petaloconchus glomeratus is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.
Thylacodes arenarius is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.
Vermetus afer is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.
Vermetus enderli is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.
Vermetus eruca is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.
Vermetus granulatus is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.
Thylacodes masier is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.
Thylaeodus semisurrectus is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells.
Petaloconchus is a genus of sea snails, marine gastropod mollusks in the family Vermetidae, the worm snails or worm shells.
Vermetus is a genus of sea snails, marine gastropod mollusks in the family Vermetidae, the worm snails or worm shells.
Dendropoma corallinaceus is a species of sea snail, a marine gastropod mollusk in the family Vermetidae, the worm snails or worm shells. It is a colonial species and forms aggregations on the lower shore near low-water mark. It is native to South Africa.
Thylaeodus is a genus of sea snails, marine gastropod mollusks in the family Vermetidae, the worm snails or worm shells.