placoderm वाक्य
उदाहरण वाक्य
मोबाइल
- Because they had reduced armor, the ptyctodontids were once thought to be the most primitive of the placoderms.
- From these analysises, this idea of a gradient from least armored to most armored in placoderms was discarded.
- Vertebrates included armored fishes, also preserved in the Llano Uplift . Contemporary placoderms were preserved in central Texas.
- There is also a unique organ of yunnanolepid antiarch placoderms named " Chang's Apparatus " after her.
- It was thought for a time that placoderms became extinct due to competition from the first Devonian / Carboniferous extinction events
- This hypothesis helps to explain the placoderms'seemingly instantaneous appearance and diversity at the very beginning of the Devonian.
- "' Aspinothoracidi "'is a clade of placoderms, restricted that family to only its type species.
- There are three main groups of placoderms that have been found in Michigan, the antiarchs, arthrodires, and ptyctodonts.
- "' Holonematidae "'is an family of relatively large arthrodire placoderms from the Early to Late Devonian.
- During the Devonian, the placoderms went on to inhabit and dominate almost all known aquatic ecosystems, both freshwater and saltwater.
- As Nigel departs for the surface, he explains that the placoderms as a whole have a grim future ahead of them.
- They became extinct at the end of the Devonian period that also claimed the Placoderms and most other jaw-less fish.
- ""'Wuttagoonaspis " "'is a genus of primitive arthrodire placoderms from Middle Devonian Australia.
- The first lobe-finned bony fish appeared in the Devonian, while the placoderms began dominating almost every known aquatic environment.
- In another twenty million years, the entire Class of placoderms will disappear, much to the other Devonian fish's relief.
- This would have allowed the placoderms to invest more time and energy in producing and nurturing fewer, but more developed, offspring.
- Spiny sharks did not diversify as much as placoderms, but survived much longer into the Early Permian about 290 million years ago.
- The vertebrate jaw probably originally evolved in the Silurian period and appeared in the Placoderm fish, which further diversified in the Devonian.
- Recent studies indicate that Osteichthyes evolved from placoderms like " Entelognathus ", while acanthodians are more closely related to modern chondrichthyes.
- Inversely, ptyctodontids are now considered to be the most derived of placoderms, being ancestral and forming a gradient to modern jawed vertebrates.
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