Arthropoda

Question 1

General Sense organs of arthropods

Answer 1

Eyes, olfactory receptors (smell), antennae (touch)

Question 2

location of most sensory organs

Answer 2

anterior end of the animal

Question 3

is the shedding of exoskeleton

Answer 3

molting or ecdysis

Question 4

______ are most abundant and diverse animals

Answer 4

arthropods

Question 5

4 subphyla of arthropods

Answer 5

trilobata, chelicerata, crustacea, uniramia

Question 6

what are the animals under chelicerata

Answer 6

eurypterids, horseshoe crabs, spiders, ticks

Question 7

animals under uniramia

Answer 7

millepeds, centipeds, pauropods, insects

Question 8

are the most diverse and numerous arthropods

Answer 8

insects

Question 9

how many species are the insects

Answer 9

about a million

Question 10

what are the characteristics that made the insects different from other arthropods

Answer 10

having three pairs of legs, two pairs of wings on the thorax, found in practically all habitats on earth

Question 11

Largest of the six classes of crustaceans

Answer 11

Malacostracans

Question 12

the malastrocan’s body is divided into three segments, namely the:

Answer 12

head, thorax, abdomen

Question 13

head and thorax may be fused to form the

Answer 13

cephalothorax

Question 14

cephalothorax is covered with a

Answer 14

carapace

Question 15

carapace may be ____, _____, and _____

Answer 15

cylindrical, depressed, rostrum

Question 16

a pair of ____ project from beside the rostrum

Answer 16

eyes

Question 17

in shape, the carapace may be _______

Answer 17

triangular, square, round or circular, oval or hexagonal

Question 18

the surface of the carapace is divided into regions, what are they?

Answer 18

distinct, smooth, granular, may possess hairs, bristles, and tubercles

Question 19

the typical malacostracan appendages is ______

Answer 19

biramous or two-branched

Question 20

the appendages consists of the ______

Answer 20

protopodite, exopodite, endopodite

Question 21

from proximal to distal, the segments of a typical seven-segmented appendage are:

Answer 21

coxa, basis, ischium, merus, carpus, propodus, and dactylus

Question 22

from anterior to posterior, the five pairs of cephalic appendages are:

Answer 22

antennules, antennae, mandibles, first maxillae, second maxillae

Question 23

arising posterior to the primary mouth parts from the anterior to posterior are the

Answer 23

first maxillipeds, second maxillipeds, third maxillipeds, and the pereiopods (five pairs of legs)

Question 24

brachyurans are

Answer 24

true crabs

Question 25

the abdomen consists of six segments, each segment consists of:

Answer 25

a telson, a tergum, two pleura, and a sternum

Question 26

______ dimorphisms may occur in crabs

Answer 26

sexual

Question 27

the abdomen of females maybe ____ than that of males true crabs

Answer 27

wider

Question 28

what do you call the picer-like or claw-like appendages of crabs

Answer 28

chelipeds or chelae; or subchelate if it forms a prehensile claw or subchelae

Question 29

what do you call the appendages of true crabs

Answer 29

pereiopods

Question 30

when can chelipeds be equal or unequal

Answer 30

equal if both chelipeds are same shape or size

unequal if one cheliped is bigger than the other

Question 31

when there is sexual dimorphism, chelipeds are _____ in males than females

Answer 31

bigger