Heterostraci

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iHeterostraci Fossil range: Silurian - Devonian
Drepanaspis gemuendina, accompanied by Tiaraspis subtilis
Conservation status
Extinct (fossil)
Scientific classification
Kingdom: Animalia Phylum: Chordata Class: Agnatha Subclass: Pteraspidomorphi Order: 'Heterostraci'
Family
Anglaspis Palaeodus Cyathaspidae

Heterostraci (Heterostracans) are an extinct marine taxon of vertebrate. They are a subgroup of the Pteraspidomorphi and in the taxon Agnatha (Ostracoderms). Examples are Doryaspis, Protaspis (Cosmaspis) and Allocryptaspis sandbergi. The Taxon is only known from Silurian and Devonian sediments. Remarkable is their hypocercal tail.

[edit] See also

• Astraspidida
• Coelolepida

[edit] External links

• tolweb.org
• pwrmark.biology.ualberta.ca
• geol.lsu.edu