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What happens if the rate of extinction in a clade is greater than the rate of speciation?

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Q: What happens if the rate of extinction in a clade is greater than the rate of speciation?
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What are all of the clades of the magnorder Boreoeutheria?

Very briefly, Boreoeutheria are divided into two extant principal clades: Euarchontoglires and Laurasiatheria. Euarchontoglires include in turn, Archonta and Glires. The extant orders constituting Archonta are Scandentia (tree-shrews), Primates (lemurs etc., monkeys and people) and Dermoptera (colugos). Glires include orders Lagomorpha (hares, rabbits) and Rodentia (porcupines, cavies, squirrels, beavers, rats, mice, gerbils, etc.). Laurasiatheria include: Eulipotyphla and Scrotifera. (Eulipotyphla are a depleted version of Lipotyphla which in turn was a remnant of the old Insectivora. Eulipotyphla were subsequently split into Soricomorpha (shrews) and Erinaceomorpha (hedgehogs & gymnures) but then recombined by those who accept that erinaceomorphs are nested within soricomorphs). So order, Eulipotyphla, is what we call them. Scrotifera include order, Chiroptera (bats) and Fereuungulata. (Yes, there's a syllabic division between the two 'U's!) Fereuungulata contain: Ferae - order, Pholidota (pangolins which have been estranged from anteaters) and order, Carnivora (cats, hyenas, dogs, bears, weasels, raccoons, seals, etc.) Now the ungulates probably form a single clade alongside Ferae and are called, Ungulata, or maybe Euungulata (proper ungulates unlike those imposters, the elephants and relatives which have been shunted elsewhere). If Ferae turn out to be nested within ungulates then the (Eu)ungulate clade would no longer stand. We now arrive among ungulates. Two major groups: order, Perissodactyla (horses, tapirs, rhinos) and what seems to be fairly universally referred to these days as Cetartiodactyla. Cetartiodactyla include the even-toed ungulates (camels, pigs, hippos, giraffes, antelopes, cattle, sheep, goats, deer) traditionally referred to order, Artiodactyla, but the so-called order, Cetacea (whales), is now considered as a prodigal child returned to the artiodactyl home, as the common cetacean ancestor appears to be rooted somewhere near the hippopotamus branch. Work is still in progress, and will continue for a while yet, as individual researchers ride their personal hobby horses in progressively similar directions. Taxonomists furthermore are a fertile source of opinions. As for including extinct taxa, like (just one example) the various prehistoric South American ungulate-type groups, that is another game within another level of mystery.

Related questions

When was Emil Clade born?

Emil Clade was born on 1916-02-26.

What are characteristics that are shared by members of a clade and only by members of that clade?

Derived Characteristics.

The taxonomy group of sampaguita?

The scientific classification of sampaguita is: Kingdom: Plantae Clade: Tracheophytes Clade: Angiosperms Clade: Eudicots Clade: Asterids Order: Gentianales Family: Rubiaceae Genus: Jasminum Species: Jasminum sambac

What does transitional mean?

In the context of palaeontology, calling a fossil a 'transitional form' means that it's morphologically intermediate between a basal clade and a specific derived clade. Meaning that the shapes of its bones are such as would be expected from a descendant of the basal clade that is also ancestral to the derived clade.

What clade does Euglena belong too phylogenically?

Euglena belongs to the clade Euglenozoa phylogenetically. This clade includes single-celled organisms with a flagellum and is part of the Excavata supergroup in the domain Eukarya.

What clade is ceratium?

Ceratium belongs to the clade Dinoflagellata, which are a group of single-celled aquatic organisms that are known for their diverse shapes and characteristics, including the presence of two flagella.

Who is Dr Jerome R Clade?

Dr. Jerome R. Clade is the author of the book "The Fundamentals of Animal Behavior".

What are differences and similarities between a class reptilia and a clade reptilia?

clade and class are different because one says clade and the other says class. the same thing they have in common is that they both have reptilia at the end.

What are the character states shared by the ancestor or outgroup of a clade called?

Character states shared by the ancestor or outgroup of a clade are referred to as plesiomorphies. These are ancestral traits that were present in the common ancestor of a group but are not unique to the members of the clade.

Are shared derived traits found in members of the in group of a clade?

Yes, shared derived traits are found in members of the in-group of a clade. These traits are characteristics that are unique to the members of that specific clade and are inherited from a common ancestor. Shared derived traits help define the relationships within the clade and distinguish its members from those of other groups.

What has the author Harald Clade written?

Harald Clade has written: 'Kostenerstattungsverfahren in der GKV' -- subject(s): Accounting, Health Insurance

What is the definition for iron clade?

"Ironclad" typically refers to something that is extremely strong, resilient, or invulnerable. It can be used to describe a person's resolve, a secure contract, or an impregnable fortress.

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