Mieridduryn

Mieridduryn; Temporal range:
	Holotype specimen and interpreted drawing
	Diagrammatic reconstruction
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Dinocaridida
Family:	†Opabiniidae
Genus:	†Mieridduryn; Pates et al, 2022
Type species
	Mieridduryn bonniae; Pates et al, 2022

Mieridduryn is a genus of extinct dinocaridid arthropod that lived during the Middle Ordovician of what is now the United Kingdom. This animal was described in 2022 based on a singular fossil found in Castle Bank, a Burgess shale type lagerstätte located in the country of Wales. This animal's taxonomic affinities are somewhat unclear, but there are some hypotheses. One is that this animal represents a new grade of stem-euarthropods that evolved features similar to the Cambrian aged opabiniids (a family of basal arthropods). Another is that if the features seen in Mieridduryn are convergent, and not homologous, to those seen in radiodonts, then this animal represents a late surviving opabiniid (if the latter option is correct, then this means the opabiniids survived for over 40 million years longer than what was once thought).^[1]^[2]^[3]^[4]

^ Pates, S.; Botting, J. P.; Muir, L. A.; Wolfe, J. M. (2022). "Ordovician opabiniid-like animals and the role of the proboscis in euarthropod head evolution". Nature Communications. 13 (1). 6969. doi:10.1038/s41467-022-34204-w. PMC 9666559. PMID 36379946.
^ Pates, Stephen; Wolfe, Joanna M.; Lerosey-Aubril, Rudy; Daley, Allison C.; Ortega-Hernández, Javier (2022-02-09). "New opabiniid diversifies the weirdest wonders of the euarthropod stem group". Proceedings of the Royal Society B: Biological Sciences. 289 (1968): 20212093. doi:10.1098/rspb.2021.2093. PMC 8826304. PMID 35135344.
^ Briggs, Derek E. G. (2015-04-19). "Extraordinary fossils reveal the nature of Cambrian life: a commentary on Whittington (1975) 'The enigmatic animal Opabinia regalis, Middle Cambrian, Burgess Shale, British Columbia'". Philosophical Transactions of the Royal Society B: Biological Sciences. 370 (1666): 20140313. doi:10.1098/rstb.2014.0313. PMC 4360120. PMID 25750235.
^ Whittington, H. B. (June 1975). "The enigmatic animal Opabinia regalis, Middle Cambrian Burgess Shale, British Columbia". Philosophical Transactions of the Royal Society B. 271 (910): 1–43 271. Bibcode:1975RSPTB.271....1W. doi:10.1098/rstb.1975.0033. JSTOR 2417412. Free abstract at Whittington, H. B. (1975). "The Enigmatic Animal Opabinia regalis, Middle Cambrian, Burgess Shale, British Columbia". Philosophical Transactions of the Royal Society B. 271 (910): 1–43. Bibcode:1975RSPTB.271....1W. doi:10.1098/rstb.1975.0033.

[:0-1] Pates, S.; Botting, J. P.; Muir, L. A.; Wolfe, J. M. (2022). "Ordovician opabiniid-like animals and the role of the proboscis in euarthropod head evolution". Nature Communications. 13 (1). 6969. doi:10.1038/s41467-022-34204-w. PMC 9666559. PMID 36379946.

[:2-2] Pates, Stephen; Wolfe, Joanna M.; Lerosey-Aubril, Rudy; Daley, Allison C.; Ortega-Hernández, Javier (2022-02-09). "New opabiniid diversifies the weirdest wonders of the euarthropod stem group". Proceedings of the Royal Society B: Biological Sciences. 289 (1968): 20212093. doi:10.1098/rspb.2021.2093. PMC 8826304. PMID 35135344.

[:1-3] Briggs, Derek E. G. (2015-04-19). "Extraordinary fossils reveal the nature of Cambrian life: a commentary on Whittington (1975) 'The enigmatic animal Opabinia regalis, Middle Cambrian, Burgess Shale, British Columbia'". Philosophical Transactions of the Royal Society B: Biological Sciences. 370 (1666): 20140313. doi:10.1098/rstb.2014.0313. PMC 4360120. PMID 25750235.

[Whittington1975-4] Whittington, H. B. (June 1975). "The enigmatic animal Opabinia regalis, Middle Cambrian Burgess Shale, British Columbia". Philosophical Transactions of the Royal Society B. 271 (910): 1–43 271. Bibcode:1975RSPTB.271....1W. doi:10.1098/rstb.1975.0033. JSTOR 2417412. Free abstract at Whittington, H. B. (1975). "The Enigmatic Animal Opabinia regalis, Middle Cambrian, Burgess Shale, British Columbia". Philosophical Transactions of the Royal Society B. 271 (910): 1–43. Bibcode:1975RSPTB.271....1W. doi:10.1098/rstb.1975.0033.

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