Definition of Agnathans. Meaning of Agnathans. Synonyms of Agnathans

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Definition of Agnathans

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Meaning of Agnathans from wikipedia

- strongly supports the hypothesis that living agnathans, the cyclostomes, are monophyletic. The oldest fossil agnathans appeared in the Cambrian, and two groups...
- Cyclostomata is a group of agnathans that comprises the living jawless fishes: the lampreys and hagfishes. Both groups have jawless mouths with horny...
- Agnathans of the Lochkovian Taxa Presence Location Description Images Drepanaspis Lochkovian-Emsian Hunsrück Slate, Germany, among others in Europe Errivaspis...
- have evolved as a region distinct from the medulla by the time the first agnathans appeared, 505 million years ago. Location and topography of Pons (animation)...
- developed medulla oblongata. Since these are both very similar to early agnathans, it has been suggested that the medulla evolved in these early fish, approximately...
- present in many fossil agnathans, including conodonts. Agnathans declined in the Devonian and never recovered. The agnathans as a whole are paraphyletic...
- Siberaspidoidei is a taxon of extinct amphiaspidid heterostracan agnathans whose fossils are restricted to Lower Devonian marine strata of Siberia near...
- Agnathans of the Aeronian Taxa Presence Location Description Images Jamoytius Rhuddanian-Telychian It had an elongated body and a dorsal fin and an anal...
- Agnathans of the Dapingian Taxa Presence Location Description Images Sacabambaspis Dapingian-Sandbian Sacabamba, Cochabamba Department, Bolivia; Horn...
- pp. ISBN 978-0-471-25031-9. Forey, Peter; Janvier, Philippe (2000). "Agnathans and the origin of jawed vertebrates". In Gee, Henry (ed.). Shaking the...
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