Janaspis

Janaspis; Temporal range: Early Devonian PreꞒ Ꞓ O S D C P T J K Pg N
	Headshield reconstruction
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Osteostraci
Order:	Zenaspida
Family:	Zenaspidae
Genus:	Janaspis
Type species
	Janaspis pagei;
Species
	Janaspis pagei; Janaspis punctata; Janaspis newtonensis;

Janaspis is an extinct genus of osteostracan, that lived in the early Devonian period in Britain. It is characterised by a number of features of its armoured headshield, including the presence of raised rims around its eyes, the shape of its lateral and median fields (depressed areas of the headshield covered by small loose plates, which are common to most Osteostraci), its prominent dorsal spine, fairly long cornual processes (backwards pointing spines on each side of the headshield) and ornamentation. Janaspis was fairly small compared with other osteostracans, with a headshield measuring less than 60mm.^[1]

References[]

^ Joseph N. Keating, Robert S. Sansom and Mark A. Purnell (2012). "A new osteostracan fauna from the Devonian of the Welsh Borderlands and observations on the taxonomy and growth of Osteostraci". Journal of Vertebrate Paleontology. 32 (5): 1002–1017. doi:10.1080/02724634.2012.693555.

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[KeatingetalJVP2012-1] Joseph N. Keating, Robert S. Sansom and Mark A. Purnell (2012). "A new osteostracan fauna from the Devonian of the Welsh Borderlands and observations on the taxonomy and growth of Osteostraci". Journal of Vertebrate Paleontology. 32 (5): 1002–1017. doi:10.1080/02724634.2012.693555.

[1]