| 词条 | Laevicardium crassum |
| 释义 |
| name = Laevicardium crassum | fossil_range = Quaternary – Present [1] | image = Laevicardium crassum.jpg | image_caption = Valves of Laevicardium crassum | image2 = Cardiidae - Laevicardium crassum.JPG | image2_caption = Fossils of L. crassum from Pliocene of Italy | regnum = Animalia | phylum = Mollusca | classis = Bivalvia | ordo = Veneroida | familia = Cardiidae | genus = Laevicardium | species = L. crassum | binomial = Laevicardium crassum | binomial_authority = Gmelin, 1791 }}Laevicardium crassum, the Norwegian egg cockle, is a species of saltwater clam, a cockle, a marine bivalve mollusc in the family Cardiidae, the cockles.[1] Fossil recordFossils of Laevicardium crassum are found in marine strata of the Quaternary (age range: from 0.126 to 0.012 million years ago.). Fossils are known from various localities in Ireland, Italy, Netherlands and Portugal.[2] DescriptionShell of Laevicardium crassum can reach a length of about {{convert|7.5|cm}}. The shell exterior is white or light yellow with occasional dark markings. The shell surface is smooth and shows 40-50 ribs with a crenulated margin.[3] DistributionThis species is present in Northeast Atlantic and the Mediterranean, at depths of 9 to 200 m.[1][3] Bibliography
References1. ^1 WoRMS {{Taxonbar|from=Q1386585}}{{bivalve-stub}}2. ^1 Paleontology Database 3. ^1 Sealife Base 2 : Cardiidae|Bivalves described in 1791 |
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