Lab practical #1 - Trilobita & Chelicerata

Question 1

Answer 1

Trilobita

1. Found in the Arkansas Ozarks in Limestone
2. Ancient marine deposits
3. Many trilobites roll themselves into a ball for protection

Question 2

Answer 2

Araneae - “Spiders”

1. Differentiate between sexes
2. Male - enlarged pedipalps
3. Females - epigastric furrow
4. Chelicera

Question 3

Answer 3

Acari - “Mites”

1. Mites from berlese samples of ground litter
2. Oribatids with pteromorphs (hinged wing-like extensions on notum)

Question 4

Answer 4

Pseudoscorpiones - “Pseudoscorpions”

1. Occur under the bark, stones, moss, and in leaf litter
2. Chelate (pincher-like) pedipalps
3. They are carried phoretically by various insects