Unit 2: Lesson 12- Arthropods

Question 1

Arthropod relatives

Answer 1

Phylum Onychophora (velvet worms)
Phylum Tardigrada

Question 2

Phylum Arthropoda

Answer 2

chitin exoskeleton (structural support, waterproof), jointed appendages, segmentation, coelomate, bilateral, triploblastic, open gut, cephalization, advanced smell/sight, colonized land 450 mya

Question 3

Arthropoda organ systems

Answer 3

Open circulatory system (copper-based hemolymph), no blood vessels

Respiratory system with gills/tracheal system (spiracles, tergum)

Question 4

Class Trillobita

Answer 4

Extinct, dominated during Cambrian, scavenger, could roll up

Question 5

Subphylum Chelicerata

Answer 5

chelicerae (fangs), 2 body parts, 4 pairs of walking legs, 1 pair of pedipalps, book lung

Question 6

Class Merostoma (Subphylum Chelicerata)

Answer 6

Horseshoe crabs, cephalothorax, “living fossil” (hasn’t evolved in a while)

Question 7

Class Arachnida (Subphylum Chelicerata)

Answer 7

spiders, scorpions, mites, ticks, predators/parasites

Question 8

Class Chilopoda (Subphylum Myriapoda)

Answer 8

centipedes, dorsal-ventrally flat, predators, venom claws, each segment 1 pair of legs

Question 9

Class Diplopoda (Subphylum Myriapoda)

Answer 9

Millipedes, cylindrical/robust, herbivores, each segment 2 pairs of legs

Question 10

Class Insecta (Subphylum Hexapoda)

Answer 10

most diverse of all animals, 3 pairs of walking legs, long evolutionary history, short lifespan, 2 pairs of wings, 3 body parts, antennae, coevolution with plants, small

Question 11

Complete Metamorphosis Insects

Answer 11

Form chrysalis

Coleoptera (beetle), Diptera (fly), Hymenoptera (bee/ant/wasp), Lepidoptera (butterfly/moth)

Question 12

Incomplete Metamorphosis Insects

Answer 12

Have an immature nymph stage

Hemiptera (true bugs), Orthoptera (crickets)

Question 13

Class Maxillopoda (Subphylum Crustacea)

Answer 13

barnacles, free-living larva, sessile filter feeding adults

Question 14

Class Malacostraca (Subphylum Crustacea)

Answer 14

2 pairs antennae, isopods + decapods

Order Decapoda- 8 walking legs, 2 pincers (10 limbs total), crabs, lobsters, crayfish