Ecdysozoans

Question 1

Ecdysozoans: The _______ Animals

Answer 1

Molting

Question 2

In Ecdysozoans, A major innovation during animal evolution: development of ________

Answer 2

exoskeleton

Question 3

An animal with an exoskeleton grows by ___________

Answer 3

periodically molting

Question 4

The presence of an exoskeleton opened avenues for the evolution of ___________ plans

Answer 4

new body

Question 5

Animals with Flexible Exoskeletons have Tough _________ are found in members of two phyla that live in freshwater, marine, and terrestrial environments

Answer 5

cuticles

Question 6

What are cuticles?

Answer 6

exoskeleton that protects body but provides no support

Question 7

Phylum ___________: Roundworms

Answer 7

Nematoda

Question 8

Nematoda; Many are ________; most are _______ living

Answer 8

parasites; free

Question 9

What are some examples of Nematoda?

Answer 9

Trichinella; Ascaris, hookworms, pinworms, Wuchereria

Question 10

Phylum ___________: “jointed foot”

Answer 10

Arthropoda

Question 11

In arthropoda, Body covering became thickened and rigid by the incorporation of layers of ______________

Answer 11

protein and chitin

Question 12

Animals with rigid exoskeletons have appendages that can be _____________ by muscles

Answer 12

manipulated

Question 13

The bodies of all chelicerates are divided into two major regions: ______________

Answer 13

cephalothorax and abdomen

Question 14

Cephalothorax bears __________ of jointed legs

Answer 14

four pairs

Question 15

In Chelicerates, the class __________ include scorpions, harvestmen, spiders, mites, and ticks

Answer 15

Arachnida

Question 16

Crustaceans have a body divided into two regions: a __________________

Answer 16

cephalothorax (= head + thorax), and an abdomen

Question 17

Examples of Crustaceans

Answer 17

shrimps, lobsters, crayfishes, crabs, sow (= pill) bugs (or roly polies), barnacles, and sand fleas

Question 18

Insects have three body regions: _____________

Answer 18

head, thorax, and abdomen

Question 19

Insects, single pair of _________ on the head

Answer 19

antennae

Question 20

Insects, _____________ attached to the thorax

Answer 20

three pairs of jointed legs

Question 21

Insecta, Crustacea, Arachnids, and Chelicerata are part of what phylum?

Answer 21

Arthropoda

Question 22

What is metamorphosis?

Answer 22

Metamorphosis: substantial change between one developmental stage and another

Question 23

Complete Metamorphosis: adult looks __________ from larva

Answer 23

completely different

Question 24

Incomplete Metamorphosis: eggs hatch into nymphs (or instars) which look like ____________

Answer 24

miniature adults

Question 25

What subphylum are the Centipedes and Millipedes part of?

Answer 25

Myriapoda

Question 26

Myriapoda have many _____________ and ________ pairs of legs

Answer 26

segments; many

Question 27

Centipedes: _____ legs per segment; _________

Answer 27

two; predators

Question 28

Millipedes: ________ legs per segment; ________ or plant feeders

Answer 28

four; scavengers

Question 29

Most evolution of protostomes took place in the _________

Answer 29

oceans

Question 30

In protostomes, Early animals used fluid-filled spaces as _________ skeletons

Answer 30

hydrostatic

Question 31

In protostomes, __________ may have led to the development of hard, external body coverings

Answer 31

Predation

Question 32

In protostomes, Subdivision of the body cavity _____________________

Answer 32

increased movement control and permitted independent body part movement