Lecture 14: Speciation

Question 1

Diversity is…

Answer 1

bewildering!

BEETLES

Question 2

BEETLES:

Answer 2

• Nearly 25% of all known types of animals
• 40% of all described insects are beetles
• 400,000 species known – estimated up to 4 million, so depending on the estimates up to 95% of beetle species have not been described.

Question 3

Species diversity is generated by the

Answer 3

net excess of cladogenesis over extinction

Question 4

anagenesis

Answer 4

species formation without branching of the evolutionary line of descent

Question 5

cladogenesis

Answer 5

the formation of a new group of organisms or higher taxon by evolutionary divergence from an ancestral form.