PHYLUM ARTHROPODA

Question 1

largest phylum in the animal world; dominate the animal kingdom with an estimated 85 percent of known species included in this phylum; principal characteristics of all the animals in this phylum are functional segmentation of the body and presence of jointed appendages

Answer 1

Arthropoda

Question 2

protein support for the body; made principally of chitin, which is a waterproof, tough polysaccharide

Answer 2

exoskeleton

Question 3

true body cavity

Answer 3

eucoelomate

Question 4

the covering of an arthropod

Answer 4

cuticle

Question 5

which is a thin, waxy water resistant outer layer containing no chitin

Answer 5

epicuticle

Question 6

which is a thin, waxy water resistant outer layer containing no chitin

Answer 6

epicuticle

Question 7

“to strip off”; this is a cumbersome method of growth, and during this time, the animal is vulnerable to
predation.

Answer 7

ecdysis

Question 8

presence of six legs (three pairs) in these animals as differentiated from the number of pairs present in other arthropods.

Answer 8

Hexapoda

Question 9

distinct region typically comprising several adjoining segments

Answer 9

tagma

Question 10

bears one pair of sensory antennae, mandibles as mouthparts, a pair of compound eyes, and some ocelli

Answer 10

head

Question 11

simple eyes

Answer 11

ocelli

Question 12

bears three pairs of legs (one pair per segment) and two pairs of wings

Answer 12

thorax

Question 13

bears three pairs of legs (one pair per segment) and two pairs of wings

Answer 13

thorax

Question 14

usually has eleven segments and bears reproductive apertures

Answer 14

abdomen

Question 15

respiratory opening or holes

Answer 15

spiracles

Question 16

includes arthropods with numerous legs (number of legs may vary from 10 to 750); All myriapods are terrestrial animals and prefer a humid environment

Answer 16

Myriapoda

Question 17

animals that bear one pair of legs per segment, mandibles as mouthparts, and are some what dorsoventrally flattened

Answer 17

chilopoda

Question 18

bear two pairs of legs per diplosegment, a feature that results from embryonic fusion of adjacent pairs of body segments

Answer 18

diplopoda

Question 19

most dominant aquatic arthropods; possess two pairs of antennae, mandibles as mouthparts,
and biramous appendages

Answer 19

crustacea

Question 20

this means that their legs are formed in two parts

Answer 20

biramous appendages

Question 21

the head and thorax of most crustaceans is fused to form a __________

Answer 21

cephalothorax

Question 22

cephalothorax is covered by a plate called the __________

Answer 22

carapace

Question 23

blood cavity

Answer 23

hemocoel

Question 24

the respiratory pigments present in these crustaceans

Answer 24

Hemocyanin and hemoglobin

Question 25

the gonad can switch from producing sperm to ova, may also be seen in some species

Answer 25

Serial/sequential hermaphroditism

Question 26

includes animals such as spiders, scorpions, horseshoe crabs, and sea spiders; predominantly terrestrial;

Answer 26

chelicerata

Question 27

first pair of appendages, which are specialized, claw-like or fang-like mouthparts.

Answer 27

chelicerae

Question 28

second pair of appendages

Answer 28

pedipalps

Question 29

equivalents of cephalothorax (usually smaller)

Answer 29

prosoma

Question 30

equivalent to abdomen (usually larger)

Answer 30

opisthosoma

Question 31

equivalent to abdomen (usually larger)

Answer 31

opisthosoma

Question 32

an additional pair of appendages present between the chelicerae and pedipalps.

Answer 32

ovigers

Question 33

Most chelicerates ingest food using a __________ formed by the chelicerae and pedipalps.

Answer 33

preoral cavity

Question 34

determine the class: spiders, scorpions

Answer 34

arachnida

Question 35

determine the class: horseshoe crabs

Answer 35

merostomata

Question 36

determine the class: sea spiders

Answer 36

pycnogonida

Question 37

determine the class: sea spiders

Answer 37

pycnogonida

Question 38

determine the class: centipedes

Answer 38

chilopoda

Question 39

determine the class: millipedes

Answer 39

diplopoda

Question 40

determine the class: barnacles

Answer 40

maxillipoda

Question 41

these are winged insects

Answer 41

insecta

Question 42

blastopore turns into oral cavity

Answer 42

protostomic

Question 43

blastopore to anal cavity

Answer 43

deuterostomes

Question 44

opening of the central cavity of embryo

Answer 44

blastopore