Anoigmaichnus
| Anoigmaichnus | |
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Trace fossil classification  |
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| Unrecognized taxon (fix): | Anoigmaichnus |
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Anoigmaichnus is an ichnogenus of bioclaustrations (a type of trace fossil). Anoigmaichnus includes shafts perpendicular to host's growth surface or tilted (up to 45°); conical to cylindrical; circular to oval cross-sections; lacking separate wall. Their apertures are elevated above host's growth surface forming a short chimney-like structures. Anoigmaichnus is the worlds earliest known macroscopic endobiotic symbiont and it may have been a parasite. It occurs in the Middle Ordovician bryozoans of Osmussaar Island, Estonia.[1]
References
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