Sentences with phrase «most land vertebrates»

Not exact matches

«In Japan, many important vertebrate fossils have been discovered by amateurs because most of the land is covered with vegetation, and there are few exposures of fossil - bearing Cretaceous rocks.

Now there are 30,000 ray - finned fish species in the ocean, making this class the most numerically diverse and ecologically dominant among all vertebrates on land or in the ocean.

The second change involved in the transition to frogs and toads from other amphibians was in the sacral ribs, broad bones attached to a vertebra which in most land - living vertebrates fit below and inside the pelvis to hold it fixed relative to the backbone.

Before the dinosaurs, around 260 million years ago, a group of early mammal relatives called dicynodonts were the most abundant vertebrate land animals.

Although specimens of fishes, marine reptiles, non-avian dinosaurs, birds, and mammals of this age have all been recovered from this now - frozen continent, most fossils, especially those of land - living species, are fragmentary and poorly informative, and a number of major vertebrate groups that likely once lived in Antarctica (e.g., amphibians, crocodilians) have yet to be discovered at all.

But the study's most significant impact may be to provide new insights into how vertebrates made the transition from water to land.

Ecuador ranks as one of the world's most biodiverse countries, and has the greatest biodiversity of land vertebrates per area.