Mammals Chart

Mckenna bell 1997 and wilson reader 2005 provide useful recent compendiums. They are divided into three subclasses and about 26 orders there is no consensus among biologists.

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There are about 5 000 species of living mammals.

Mammals chart. Marine mammals represent a variety of ecological roles including herbivores manatees filter feeders baleen whales and top predators killer whales mammals evolved on land around 160 million years ago. Mammals ordered by their weight the mammals listed on this page are sorted by their weight. Have been completely abandoned by modern taxonomists.

Mammal classification has been through several iterations since carl linnaeus initially defined the class. Unlike other animals mammals have body hair have 3 middle ear bones the malleus incus and stapes and nourish their young with milk that females produce in modified sweat glands that are. Not all mammals are listed only the ones where we know their weight as an adult.

Synapsids from this period include dryolestes more closely related to. The evolution of mammals has passed through many stages since the first appearance of their synapsid ancestors in the pennsylvanian sub period of the late carboniferous period. By the mid triassic there were many synapsid species that looked like mammals the lineage leading to today s mammals split up in the jurassic.

No classification system is universally accepted. Mammalia is a class of animal within the phylum chordata. Each taxonomic marine mammal group evolved from a different group of land mammals whose ancestors separately ventured back into the ocean environment.

This work is licensed under a creative commons attribution noncommercial 3 0 unported license. Many earlier ideas from linnaeus et al. Download doc file download pdf download pdf.

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