anthropoda (crustaceans and hexapods)

Question 1

what animal is observed in the class xiphosura?

Answer 1

horseshoe crabs

Question 2

are horseshoe crabs actually related to crabs?

Answer 2

no!

Question 3

what kind of eyes does the class xiphosura have?

Answer 3

compound eyes - made up of many lenses

Question 4

how do horseshoe crabs breathe?

Answer 4

through book gills - oxygen gets trapped in these structures

Question 5

what helps the class xiphosura steer when moving on land and prop themselves up when they get turned over?

Answer 5

long terminal spine

Question 6

what do horseshoe crabs scavenge on?

Answer 6

dead plants and animals

Question 7

class xiphosura’s larvae are?

Answer 7

planktonic

Question 8

one of the subphylum’s of anthropoda are the myriapoda. what are some characteristics?

Answer 8

1. all terrestrial
2. 3+ pairs of legs
3. less tagmatized - do not see a clear thorax
4. ocelli
5. 1 pair of antennae
6. mandibles for the main mouthpart
7. direct development

Question 9

how do myriapodians breathe?

Answer 9

through trachea - airducts that run throughout the body and holes on the side of their body

Question 10

the subphylum myriapoda has two classes. what are they?

Answer 10

class chilopoda and class diplopoda

Question 11

what are the differences between the class chilopoda (centipedes) and class diplopoda (millipedes)

Answer 11

millipedes have two pairs of legs per segment and are herbivorous, whereas centipedes have one pair of legs per segment and are carnivorous

Question 12

what is a further characteristic of the class chilopoda?

Answer 12

all are poisonous, and most have a poisonous claw behind their mouthpart that they use to subdue their prey and fight predators

Question 13

what organisms do pancrustaceans include?

Answer 13

crabs, lobsters, shrimp and relatives

Question 14

what are some morphology characteristics of crustaceans?

Answer 14

1. their exoskeleton is strengthened with calcium carbonate and is crunchy
2. they have 2 pairs of antennae
3. compound eyes (many lenses)

Question 15

crustaceans have their head and thorax merged together forming the?

Answer 15

cephalothorax

Question 16

crustaceans have a cephalothorax that is usually covered in a thin white layer, what is this layer called?

Answer 16

carapace

Question 17

what are crustaceans main mouthpart? how many segments is it?

Answer 17

mandibles (chewing mouthpart) are single segmented

Question 18

what do crustaceans use for locomotion and to help move the water to improve respiration?

Answer 18

thoracic limbs

Question 19

what do pancrustaceans use their abdominal limbs for?

Answer 19

swimming, filter feeding, holding eggs

Question 20

how do crustaceans breathe?

Answer 20

aquatic - gills
terrestrial - tracheae

Question 21

how do crustaceans reproduce?

Answer 21

sperm transfer occurs through copulation, intromission or spermatophore is deposited in the female’s genital opening

Question 22

do crustaceans have indirect or direct development?

Answer 22

both!

Question 23

some crustaceans filter-feed; are they motile or sessile?

Answer 23

can be motile (fairy shrimp) or sessile (barnacles)!

Question 24

pancrustaceans/arthropods with six legs are called?

Answer 24

hexapoda

Question 25

what is the main morphology of hexapods?

Answer 25

1. tagmentization: specialized body parts

Question 26

hexapods’ specialized body parts include?

Answer 26

1. a head
2. one pair of antennae
3. thorax with three pairs of legs
4. abdomen without paired jointed appendages
5. compound eyes
6. ocelli - single eyes
7. lack wings, then get wings

Question 27

what is a unique technique that anthropods use in their growth process?

Answer 27

molting! shedding all ectodermally derived cuticle

Question 28

what is the reproduction process for anthropods?

Answer 28

some indirectly, some copulate