NTI Day 4: Subphylum Chelicerata Part 3: Diversity

How many described species are there in the subphylum Chelicerata?

• Approximately 1,300

• Approximately 4,000

• Approximately 100,000

• Approximately 50,300

Which of the following is a characteristic of sea spiders (Class Pycnogonida)?

• They are found exclusively in shallow coastal waters.

• They typically have 4 pairs of walking legs.

• They can grow up to 70 centimeters in length.

• They are primarily terrestrial.

What is a distinctive feature of horseshoe crabs (Class Merostomata)?

• They are closely related to crustaceans.

• They possess a telson used for stinging.

• Their prosoma is covered by an unsegmented, horseshoe-shaped carapace.

• They have only simple eyes.

Which statement accurately describes arachnids?

• All arachnids are spiders.

• Most adult arachnids have six legs.

• The name "arachnid" originates from a Greek word meaning "spider."

• All arachnids are carnivorous.

Which statement is true about harvestmen?

• They are venomous to humans.

• They are able to produce silk.

• They can ingest non-liquid food.

• They have segmented bodies and short legs.

What is a unique characteristic of hooded tick-spiders (Ricinulei)?

• They have excellent eyesight.

• They possess a hood that can be lowered over their head.

• They are known for their powerful venom.

• They are the largest arachnids.

What proportion of scorpion species have venom powerful enough to kill humans?

• Approximately 1%

• Approximately 25%

• Approximately 50%

• Approximately 75%

Which statement accurately describes solpugids (wind scorpions/sun spiders/camel spiders)?

• They are a type of venomous spider.

• They are known for chasing humans.

• They are entirely nonvenomous.

• They use silk to catch prey.