Cruinnopterus

Cruinnopterus; Temporal range: Llandovery–Wenlock PreꞒ Ꞓ O S D C P T J K Pg N
	Fossil of C. scorpioides.
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Order:	†Eurypterida
Superfamily:	†Carcinosomatoidea
Family:	†Carcinosomatidae
Genus:	†Cruinnopterus; Lamsdell, 2025
Type species
	†Cruinnopterus scorpioides; (Woodward, 1868)
Other species
	†C. scotica (Laurie, 1899);
Synonyms
	Carcinosoma obesus; Carcinosoma scorpioides; Carcinosoma scoticus; Eusarcana obesus; Pterygotus raniceps;

Cruinnopterus is a genus of eurypterid, an extinct group of aquatic arthropods. The genus contains two species, the type species C. scorpioides from the Llandovery epoch, and the younger C. scotica, from the Wenlock epoch. Fossils are mainly known from Scotland, but have also been found in Ontario, Canada.^[1]

"*Eusarcana obesus*", found to be a junior synonym of *C. scorpioides*, and a juvenile specimen^[1]

Cruinnopterus differs from other carcinosomatids in the structure of its prosomal appendages, which in appearance are roughly intermediate between those of Carcinosoma and the more derived Lanarkopterus. Both C. scorpioides and C. scotica also do not have a constriction of the preabdomen, a feature seen in species of Carcinosoma.^[1]

References

1 2 3 Lamsdell, James C. (2025). "Codex Eurypterida: A Revised Taxonomy Based on Concordant Parsimony and Bayesian Phylogenetic Analyses". Bulletin of the American Museum of Natural History. 2025 (473): 112–113. doi:10.1206/0003-0090.473.1.1.

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[:22-1] 1 2 3 Lamsdell, James C. (2025). "Codex Eurypterida: A Revised Taxonomy Based on Concordant Parsimony and Bayesian Phylogenetic Analyses". Bulletin of the American Museum of Natural History. 2025 (473): 112–113. doi:10.1206/0003-0090.473.1.1.

[1]

See also

References