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Margarites helicinus, common name the helicina margarite or spiral margarite, is a species of sea snail, a marine gastropod mollusk in the family Margaritidae.[1]
Margarites helicinus has been established by Phipps in 1774 and not by Fabricus in 1780 as Winchworth (1932), Sneli (1970) (and others) mention.
Dall established in 1919 two varieties,[3] but both have become synonyms of Margarites helicinus.
The size of the shell varies between 3. mm and 11 mm. The umbilicate, thin shell has a depressed-conoidal shape. It is flesh-colored, with paler at periphery and below the suture, fading into corneous around the umbilicus. The surface is very bright, shining, polished, and smooth except for fine subobsolete concentric lines around the umbilicus. The spire is conoidal. The apex is minute but obtuse. The suture is impressed. The shell contains about 5 convex whorls, the last very rapidly widening, somewhat descending toward the aperture. The rounded aperture is oblique, angular above, nacreous inside. The pearly iridescence is often visible through the shell. The narrow umbilicus is profound. Its opening is regularly curved, not separated from the base by a carina.[4]
This marine species occurs near the seashore in circum-arctic waters, in the North Atlantic, in European waters; from the Bering Strait to California, USA; in the Sea of Okhotsk.
Spawning takes place during the spring in the San Juan Islands, WA, USA. Prior to spawning two to four snails move close together, one of these is a female and all others are male. A female release eggs only when in close proximity to a male. Eggs are released in a mucus strand 2–3 eggs wide. Eggs are orange to pinkish red, 180–200 µm in diameter, and each egg is covered by a gelatinous layer 10–30 µm thick. Sperm release is not visible during spawning but must occur since eggs in newly produced egg masses are fertilized. The female uses the leading edge of her foot to form the mucus strand into a globular egg mass 0.5–1.5 cm in diameter. Each egg masses contains 90–1000 eggs, and egg masses are anchored to algal surfaces at both ends of the egg mass.[5][6]
All embryonic and larval development takes place in the egg mass and young emerge as juvenile snails.[5][6] Development proceeds as eggs undergo spiral cleavage. Timing of development at 7–9 °C proceeds as embryos reached the gastrula stage 1.3 days after fertilization, the trochophore stage 2.1 days after fertilization, the veliger stage 3.3 days after fertilization, torsion between 4.5–5 days after fertilization, metamorphosis at 10.5 days, and hatched and crawled out of the egg mass as a juvenile snail at 12.1 days.[6]
Shells of newly emergent juvenile snails are 270–300 µm long.[5][6]
Margarites helicinus, common name the helicina margarite or spiral margarite, is a species of sea snail, a marine gastropod mollusk in the family Margaritidae.
Margarites helicinus has been established by Phipps in 1774 and not by Fabricus in 1780 as Winchworth (1932), Sneli (1970) (and others) mention.
Dall established in 1919 two varieties, but both have become synonyms of Margarites helicinus.
Margarites helicinus var. elevatus Dall, 1919 Margarites helicinus var. excavatus Dall, 1919Gljásilfri (fræðiheiti: Margarites helicinus) er lítill sæsnigill. Kuðungurinn er aðeins um 3 mm hár og litur hans er getur verið frá appelsínugulu til brúns með grænu eða fjólubláu mynstri. Gljásilfra má finna undir steinum eða fasta við þang við neðri mörk flæðarmáls og í fjörupollum.
Gljásilfri (fræðiheiti: Margarites helicinus) er lítill sæsnigill. Kuðungurinn er aðeins um 3 mm hár og litur hans er getur verið frá appelsínugulu til brúns með grænu eða fjólubláu mynstri. Gljásilfra má finna undir steinum eða fasta við þang við neðri mörk flæðarmáls og í fjörupollum.
Margarites helicinus is een slakkensoort uit de familie van de Margaritidae.[1] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1774 door Phipps.
Bronnen, noten en/of referenties
Margarites helicinus, common name the helicina margarite, là một loài ốc biển, là động vật thân mềm chân bụng sống ở biển thuộc họ Turbinidae, họ ốc xà cừ.[1]
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Phương tiện liên quan tới Margarites helicinus tại Wikimedia Commons
Bài viết liên quan đến họ Ốc xà cừ (Turbinidae) này vẫn còn sơ khai. Bạn có thể giúp Wikipedia bằng cách mở rộng nội dung để bài được hoàn chỉnh hơn. Margarites helicinus, common name the helicina margarite, là một loài ốc biển, là động vật thân mềm chân bụng sống ở biển thuộc họ Turbinidae, họ ốc xà cừ.
