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About: Kirengellida     Goto   Sponge   NotDistinct   Permalink

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The Kirengellids are a group of problematic Cambrian fossil shells of marine organisms. The shells bear a number of paired on the inner surface of the valve. These fossils have conventionally been regarded as monoplacophoran molluscs, and possibly ancestral to gastropods or cephalopods. They were presumed to be exogastric on the presumption that their larger muscle scars were anterior, but it may be dangerous to compare these scars with molluscan musculature. In any case, they coiled in the opposite direction to . However, their calcitic shells, the position of the muscle scars, and putative association with secondary shell elements, make a brachiopod affinity possible, by analogy with the : a group of phosphatic shells from the same time period, with a similar set of muscle scars. There