| 词条 | Amphiaspis |
| 释义 |
| fossil_range = Early Emsian | image = Amphiaspis_argo.jpg | image_caption = Amphiaspis argo reconstruction | regnum = Animalia | phylum = Chordata | classis = Pteraspidomorphi | ordo = Cyathaspidiformes | familia = Amphiaspididae | genus = Amphiaspis | species = A. argo | binomial = Amphiaspis argo | binomial authority = Obruchev, 1936 }} Amphiaspis argo is the type species of the cyathaspidid taxon Amphiaspidida, and of the family Amphiaspididae.[1] Its fossils are restricted to early Emsian-aged marine strata of the Taimyr Peninsula, Early Devonian Siberia. A. argo, as with all other amphiaspidids, is thought to have been a benthic filter feeder that lived on top of, or buried just below the surface of the substrate of hypersaline lagoon-bottoms. AnatomySo far, A. argos is known from at least one, incomplete cephalothoracic armor that is shaped vaguely like a pillow and is, from anterior to posterior, 24 centimeters long.[1] The armor has a pattern of lateral sensory line canals. There is a prominent dorsal spine on the dorsoposterior end of the cephalothoracic armor. The animal had small, possibly degenerate eyes that were flanked laterally by a small, crescent-shaped preorbital opening at the anterior end of the armor. The small eyes, in turn, laterally flank a small, slit-shaped mouth at the center of the anterior-most end of the cephalothorax. References1. ^1 Novitskaya, Larisse. Les amphiaspides (Heterostraci) du Devonien de la Siberie. Éditions du Centre national de la recherche scientifique, 1971. {{Taxonbar|from=Q20312776}}{{Devonian-jawless-fish-stub}} 9 : Cyathaspidiformes genera|Amphiaspidida|Devonian jawless fish|Early Devonian fish|Heterostraci genera|Fauna of Siberia|Fossils of Russia|Early Devonian first appearances|Devonian extinctions |
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