Trilobite Fossils and Arthropod Evolution

The video introduces the phylum Arthropoda, highlighting its vast diversity and traditional classification into five subphyla: Trilobitomorpha, Chelicerata, Myriapoda, Crustacea, and Hexapoda. It discusses modern views that consolidate these into two extant subphyla: Chelicerata and Mandibulata, with Pancrustacea as a clade. The extinct Trilobitomorpha is explored, detailing trilobites' history, diversity, and ecological significance. The video concludes with a preview of further exploration into the remaining subphyla.

Which of the following is NOT one of the traditional five arthropod subphyla?

• Myriapoda

• Chelicerata

• Trilobitomorpha

• Echinodermata

What is the current consensus on the number of extant arthropod subphyla?

• Two

• Five

• Three

• Four

Which subphylum is considered paraphyletic according to recent studies?

• Chelicerata

• Hexapoda

• Crustacea

• Myriapoda

What is the significance of the trilobites' name?

• It highlights their evolutionary history.

• It indicates their diet.

• It describes their three-lobed body shape.

• It refers to their habitat.

When did trilobites first appear in the fossil record?

• Late Permian

• Late Cambrian

• Early Permian

• Early Cambrian

What unique feature did trilobites possess in their eyes?

• Night vision

• Color vision

• Infrared vision

• Crystalline lenses

How many species of trilobites have been described?

• 10,000

• 22,000

• 5,000

• 50,000

What material strengthened the exoskeletons of trilobites?

• Magnesium

• Silica

• Calcium carbonate

• Iron

What concept did trilobite fossils help develop?

• Symbiosis

• Natural selection

• Punctuated equilibrium

• Genetic drift

What will be the focus of the next detailed exploration in the series?

• Myriapoda

• Chelicerates

• Trilobitomorpha

• Crustacea