| Lacuna crassior | |
|---|---|
 | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Family: | Littorinidae |
| Genus: | Lacuna |
| Species: | L. crassior |
| Binomial name | |
| Lacuna crassior (Montagu, 1803) | |
Lacuna crassior is a species of sea snail, a marine gastropod mollusk in the family Littorinidae, the winkles or periwinkles. [1]
Lacuna crassior is a circumboreal and subarctic species that has Britain as its southern limit. It has though be found in the Channel Islands and Roscoff, the edges of its southerly range. [2]
Lacuna crassior is yellow in colour and can grow up to 14 × 10 mm in length. The maximum recorded shell length is 14 mm. [3] Its body is very similar in shape to the Lacuna vincta , with a long, broad snout and slender head tentacles. Its foot is elongated, with a double-edged anterior margin and two short, white, metapodial tentacles projecting from below the operculum. These metapodial tentacles are less flattened than those of Lacuna vincta. [4] [2]
The Lacuna crassior has a strong shell, with six to seven turreted whorls. Its fine spiral striae and vertical costae are mostly obscured by thick periostracum, but form a series of irregular folds on the shell's last whorl. The umbilicus is occasionally closed and the umbilical groove reduced with the aperture drawn out and angulated at the base of the columella. [2] [4]
It is uncommon and occurs at low water spring tide (LWST), the lower part of the beach that is uncovered only a few times a month during spring tides. It also occurs offshore at a depths greater than 30 metres and up to 90 m. It can be found among stones within mud, sand, gravel and coarser sediments. [2]
Minimum recorded depth is 2 m. [3] Maximum recorded depth is 176 m. [3]
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Calliostoma cinctellum is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.
Calliostoma circumcinctum is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae.
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Lacuna pallidula, common name the pale lacuna, is a species of sea snail, a marine gastropod mollusk in the family Littorinidae, the winkles or periwinkles.
Lacuna parva, common name the tiny lacuna, is a species of sea snail, a marine gastropod mollusk in the family Littorinidae, the winkles or periwinkles.
Lacuna vincta, commonly known as northern lacuna, wide lacuna, northern chink shell, or banded chink shell, is a species of sea snail, a marine gastropod mollusk in the family Littorinidae, the winkles or periwinkles. It is found intertidally and in shallow waters in both the northern Atlantic Ocean and the northern Pacific Ocean. It is a herbivore, feeding on seaweed and diatoms with its toothed radula.
Lacuna is a genus of sea snails, marine gastropod mollusks in the family Littorinidae, the winkles or periwinkles.
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Rissoina meteoris is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoinidae.
Schwartziella bryerea is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Zebinidae.
Protatlanta souleyeti is a species of sea snail, a holoplanktonic marine gastropod mollusk in the family Atlantidae.
Distorsio perdistorta, common name the bristly distorsio, is a species of medium-sized sea snail, a marine gastropod mollusk in the family Personidae, the Distortio snails.
Turbo canaliculatus, common name the channeled turban, is a species of large sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails.
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