Inoceramus
genus of molluscs (fossil)
Inoceramus (Greek: translation "fibrous shell" for the fibrous structure of the mineral crystals in the shell) is an extinct genus of fossil marine pteriomorphian bivalves that superficially resembled the related winged pearly oysters of the extant genus Pteria. They lived from the Early Jurassic to latest Cretaceous.
The English naturalist James Sowerby proposed the name Inoceramus at a meeting of the Linnean Society in London in 1814 but a text version was not published until 1822. He gave the etymology from Greek with Latin translation as: ἴς fibra [fiber] et κέραμος testa [shell]. The fibrous-appearing mineral structure of the shell inspired the name choice: "[I]t consists entirely of a substance composed of parallel perpendicular fibres, and much more conspicuously so than Pinna or any other genus".
Taxonomy
The taxonomy of the inoceramids is disputed, with genera such as Platyceramus sometimes classified as subgenus within Inoceramus. Also the number of valid species in this genus is disputed.
Description
Inoceramids had thick shells composed of "prisms" of calcite deposited perpendicular to the surface, and unweathered fossils commonly preserve the mother-of-pearl luster the shells had in life. Most species have prominent growth lines which appear as raised semicircles concentric to the growing edge of the shell.
In 1952, the huge specimen of Inoceramus steenstrupi 187 cm long, was found in Qilakitsoq, the Nuussuaq Peninsula, Greenland.
“Inoceramus” enters the record as genus of molluscs (fossil). Crown Archives preserves that source wording while asking what Inoceramus, genus and molluscs can confirm, complicate or overturn.
Why this record matters
“Inoceramus” is worth following because a concise public description often conceals a longer documentary argument. Here, Inoceramus, genus and molluscs provides the most credible route into that argument.
Stable identifiers, scientific names and standards terminology offer the best bridge between this overview and specialist evidence. The source revision retrieved here is dated Jun 7, 2025. The linked authority identifier is Q129300. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1814, 1822 and 1952.
Current terminology should not be projected backward without checking the classification used when the underlying evidence was created. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Inoceramus” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.