Errivaspis

Errivaspis is an extinct genus of pteraspid heterostracan agnathan vertebrate known from fossils at the Wayne Hereford Quarry, of Early Devonian England, and of Podolia, Early Devonian Ukraine. It was originally described by Dr. Errol Ivor White as one of five form-variants of Pteraspis rostrata, i.e., "Pteraspis rostrata var. waynesis.^[1] In 1984, Alain Blieck moved var. waynesis into its own genus, Errivaspis, which he named after Dr. White.^[1][2] Other later researchers would then mistakenly assume that Blieck synonymized the entire genus of Pteraspis into Errivaspis.

Errivaspis Temporal range: Lochkovian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Subphylum:	Vertebrata
Infraphylum:	Agnatha
Class:	†Pteraspidomorpha
Subclass:	†Heterostraci
Order:	†Pteraspidiformes
Family:	†Pteraspididae
Genus:	†Errivaspis Blieck, 1984
Type species
Pteraspis rostrata var. waynensis White, 1935
Species
E. waynensis (White, 1935) E. depressa (Stensio, 1958) E. magnipinealis (Brotzen, 1933)
Synonyms
Plesiopteraspis depressa Stensio, 1958 Pteraspis magnipinealis Brotzen, 1933 Pteraspis major Zych, 1927

Description

Errivaspis had large dorsal plates and ventral plates, the linking branchial plate, as well as a cornual plate at the side, an orbital plate around the eye. A rostral plate formed a pointed ‘snout’, several small plates around the mouth, and a dorsal spine pointing backwards. The posterior half of the body was covered with small scales. The caudal fin was fan-shaped.