Definition of Astraspids. Meaning of Astraspids. Synonyms of Astraspids

Here you will find one or more explanations in English for the word Astraspids. Also in the bottom left of the page several parts of wikipedia pages related to the word Astraspids and, of course, Astraspids synonyms and on the right images related to the word Astraspids.

Definition of Astraspids

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Meaning of Astraspids from wikipedia

- Astraspida, or astraspids, are a small group of extinct armored jawless vertebrates, which lived in the Late Ordovician (about 450 million years ago) in...
- that of heterostracans, which are currently grouped with arandaspids and astraspids in the clade Pteraspidomorphi (Gagnier 1993, 1995; Donoghue & Smith 2001;...
- is in many respects closer to that of heterostracans that to that of astraspids. This is the only argument to place them, as the closest relatives to...