- Astraspidida
Astraspidida are an extinct marine taxon of
vertebrate . The are often grouped together with theArandaspidida .The oldest fossils are thought to be circa 460 million years old.
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Astraspidida
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Astraspidida — Pteraspidomorphi Pteraspis (Heterostraci), Zeichnung von Joseph Smit, aus Nebula to Man, 1905 England Zeitraum Unteres Ordovizium bis Oberdevon 470 bis 370 … Deutsch Wikipedia
Hyperotreti — Schleimaale Schleimaal Eptatretus stoutii Systematik Stamm: Chordatiere (Chordata) … Deutsch Wikipedia
Myxini — Schleimaale Schleimaal Eptatretus stoutii Systematik Stamm: Chordatiere (Chordata) … Deutsch Wikipedia
Myxinidae — Schleimaale Schleimaal Eptatretus stoutii Systematik Stamm: Chordatiere (Chordata) … Deutsch Wikipedia
Myxinoida — Schleimaale Schleimaal Eptatretus stoutii Systematik Stamm: Chordatiere (Chordata) … Deutsch Wikipedia
Myxinoidea — Schleimaale Schleimaal Eptatretus stoutii Systematik Stamm: Chordatiere (Chordata) … Deutsch Wikipedia
Myxinomorphi — Schleimaale Schleimaal Eptatretus stoutii Systematik Stamm: Chordatiere (Chordata) … Deutsch Wikipedia
Schleimaal — Schleimaale Schleimaal Eptatretus stoutii Systematik Stamm: Chordatiere (Chordata) … Deutsch Wikipedia
Arandaspidida — are an extinct taxon of marine vertebrate. They are one of the first craniota.The oldest known fossil of this group is Sacabambaspis janvieri, found in South America.ee also*Astraspidida *Heterostraci … Wikipedia
Heterostraci — Taxobox name = Heterostraci image caption = Drepanaspis gemuendenensis , accompanied by the placoderm Tiaraspis subtilis fossil range = Silurian Devonian |regnum = Animalia phylum = Chordata classis = Heterostraci subdivision ranks = Orders… … Wikipedia
