Craniopsidae
family of brachiopods (fossil)
Craniopsidae is an extinct family of craniiform brachiopods which lived from the mid-Cambrian to the Lower Carboniferous (Tournaisian). It is the only family in the monotypic superfamily Craniopsoidea and the monotypic order Craniopsida. If one includes the ambiguous Cambrian genus Discinopsis, craniopsids were the first craniiforms to appear, and may be ancestral to craniids and trimerellides. An even earlier Cambrian genus, Heliomedusa, has sometimes been identified as a craniopsid. More recently, Heliomedusa has been considered a stem-group brachiopod related to Mickwitzia.
Craniopsids are among the simplest of brachiopods, with few identifiable features shared between genera. The calcitic shell is rounded in profile and biconvex, with both valves equally convex. Like other craniiforms, they had two pairs of adductor (vertical closing) muscles and two pairs of oblique (diagonal sliding) muscles, with the muscle scars shifted to just behind the center of the shell. They show some similarities with kirengellids, a group of problematic Cambrian fossils representing the shells of marine organisms.
List of genera
†Craniops Hall, 1859 [Upper Ordovician ("Caradoc") – Lower Carboniferous (late Tournaisian)]
†Discinopsis?
The public source identifies “Craniopsidae” as family of brachiopods (fossil). This brief keeps that definition visible, then builds a research path around Craniopsidae, family and brachiopods.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Apr 27, 2026. The linked authority identifier is Q28432519. The first chronological checks are 1859.
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This entry incorporates text from “Craniopsidae” 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.