Acernaspis

Acernaspis
Acernaspis orestes inside burrow, [1] Jupiter Formation, Anticosti Island, Quebec.
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Trilobita
Order:	Phacopida
Family:	Phacopidae
Genus:	Acernaspis Campbell, 1967
Species
A. orestesBillings, 1860 type species = Phacops orestes, A. mimica, A. superciliexcelsis [2]
Synonyms
Eskaspis Murphycops

Acernaspis is an extinct genus of trilobite that is known from the Silurian. It contains two species, A. elliptifrons, and A. salmoensis. It is sometimes found preserved in burrows of various forms, sometimes in association with multiple moults, suggesting that it used tunnels as refuges whilst in its vulnerable moulting stage. ^[1]

References

1. Chatterton, B. D. E.; Collins, D. H.; Ludvigsen, R. (2003). "Cryptic behaviour in trilobites: Cambrian and Silurian examples from Canada, and other related occurrences". In Lane, P. D; Siveter, D. J; Fortey, R. A (eds.). Trilobites and Their Relatives. Special Papers in Palaeontology. Vol. 70. The Palaeontological Association. pp. 157–173. ISBN   978-0-901702-81-4.
2. Sandford, Andrew C.; Holloway, David J. (2006). "Early Silurian phacopide trilobites from central Victoria, Australia". Memoirs of Museum Victoria. 63 (2): 215–255. doi:10.24199/j.mmv.2006.63.17. S2CID   130169682.