Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Classis: †Acanthodii
Ordo: †Climatiiformes
Subordo: †Climatiida
Familia: †Climatiidae
Genus: Parexus
References
http://media.wiley.com/product_data/excerpt/17/04712503/0471250317.pdf
Parexus is an extinct genus of acanthodian fish. Acanthodians are often referred to as ‘spiny sharks’, although acanthodians are not true sharks and evolved perhaps 50 million years earlier than sharks. Acanthodians share several features with bony fish and cartilaginous fish; they often have spines supporting their fins.
Parexus is recognised by its large anterior dorsal fin spine. Several fossils have been discovered from the Early (Lower) Devonian Period of Tillywhandland, Scotland. Two species were described, P. recurvus and P. falcatus, both from Scotland; according to Burrow et al. (2013) P. falcatus is in fact a junior synonym of P. recurvus.[1]
References
Carole J. Burrow; Michael J. Newman; Robert G. Davidson; Jan L. den Blaauwen (2013). "Redescription of Parexus recurvus, an Early Devonian acanthodian from the Midland Valley of Scotland". Alcheringa: An Australasian Journal of Palaeontology. 37 (3): 392–414. doi:10.1080/03115518.2013.765656. S2CID 84927480.
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