And heterostracans, osteostracans and placoderms have been found in both salty AND fresh water environments.
在咸水和淡水环境中都发现了 heterostracans、osteostracans 和 placoderms。
Heterostracan
原声例句
PBS地球-动物趣闻
PBS地球-动物趣闻
And scientists have seen signs of those changes in the armor of heterostracans, osteostracans and placoderms.
科学家们已经看到了异类动物、骨类动物和盾皮动物的盔甲发生这些变化的迹象。
英语百科
Heterostraci
（重定向自Heterostracan）
![Among the most primitive heterostracans are tolypelepids (top right). Most heterostracans are pteraspidiforms, such as the pteraspidids (bottom right), doryaspidids (bottom left) and the huge psammosteids (top left), which are the youngest known members of the group.[1]](/uploads/202501/18/Heterostraci12005.gif)
Heterostraci ("Different scales") is an extinct subclass of pteraspidomorph jawless vertebrate that lived primarily in marine and estuary environments. The first identifiable heterostracans appear in the fossil record during the early Silurian, and all, save for the Psammosteids, became extinct by the start of the late Devonian. This last group of heterostracans died out in the extinction event at the end of the Devonian.
- Dendritic drainage的意思
- dendritic drainage pattern的意思
- dendritic dune的意思
- dendritic epidermal cell的意思
- dendritic evolution的意思
- dendritic expansion的意思
- dendritic fibers的意思
- dendritic field的意思
- dendritic follicle cell的意思
- dendritic gathering system的意思
- dendritic glacier的意思
- dendritic grown web crystal的意思
- dendritic growth的意思
- dendritic hair的意思
- dendritic ice crystal的意思
- dendritic inhibition的意思
- dendritic integration zone的意思
- Dendritic Keratitides的意思
- dendritic keratitis的意思
- dendritic knob的意思
- Dendritic macromolecule的意思
- dendritic macrophage的意思
- dendritic magnesium crystal的意思
- dendritic marking的意思
- dendritic markings的意思