Lecture 1 main topics Flashcards
What period of time did insects originate?
Ordovician or early silurian
What is the group neoptera known for?
Winged insects, specifically those that can flex their wings over their abdomens
What is Rhyniognatha hirsti?
Oldest insect known, extinct genus
what is strudiella devonica
Another early insect
What class of insects underwent a major radiation in the carboniferous period?
The pterygotes (winged insects)
What insects are included in the class Pterygota?
Winged insects and secondarily wingless
What class underwent another major radiation in the permian period?
Endopterygota
What insects are included in Endopterygota?
insects that go through different life stages with metamorphosis, complete metamorphosis
What stages are involved in complete metamorphosis?
Egg, larva, pupa, adult
What stages do insects with incomplete metamorphosis/hemimetaboly go through?
egg, nymph, adult
When did the largest extinction event occur?
Permian-triassic extinction
When did most modern insect families appear?
Jurassic period
How did the development of birds affect insect evolution?
Harder exoskeletons, camoflauge, hiding, mimicry
How did the diversification of plants effect insect evolution?
more niches, more food sources, modification of mouth parts, specializations, mimicry like stick bugs
When did the angiosperm radiation occur?
Cretaceous period
Many modern insect genera developed in what period? How were the preserved?
Cenozoic period, in amber
When did the first butterflies appear?
Upper paleogene
When did the hexapod gap occur?
Devonian/ early carboniferous
What are some possible reasons that the hexapod gap occured?
The fossils might have been small insects that are difficult to recognize, few rock formations deposited during the period are exposed to the surface so few potential sites are available
