Anoigmaichnus

Anoigmaichnus
Trace fossil classification
Genus:	†Anoigmaichnus; Vinn, Wilson, Mõtus and Toom, 2014
Type ichnospecies
	†A. odinsholmensis; Vinn, Wilson, Mõtus and Toom, 2014

Anoigmaichnus is an ichnogenus of bioclaustrations (a type of trace fossil). Anoigmaichnus includes shafts perpendicular to their hosts' growth surfaces or tilted (up to 45°); conical to cylindrical; circular to oval cross-sections; lacking separate wall. Their apertures are elevated above their hosts' growth surfaces, forming short chimney-like structures. Anoigmaichnus is the world's 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

Vinn, O.; Wilson, M.A.; Mõtus, M.-A. & Toom, U. (2014). "The earliest bryozoan parasite: Middle Ordovician (Darriwilian) of Osmussaar Island, Estonia". Palaeogeography, Palaeoclimatology, Palaeoecology. 414: 129–132. Bibcode:2014PPP...414..129V. doi:10.1016/j.palaeo.2014.08.021. Retrieved 2014-01-09.

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[VinnWilsonMotusToom2014-1] Vinn, O.; Wilson, M.A.; Mõtus, M.-A. & Toom, U. (2014). "The earliest bryozoan parasite: Middle Ordovician (Darriwilian) of Osmussaar Island, Estonia". Palaeogeography, Palaeoclimatology, Palaeoecology. 414: 129–132. Bibcode:2014PPP...414..129V. doi:10.1016/j.palaeo.2014.08.021. Retrieved 2014-01-09.