lab 7: arthropoda - crustacea

Question 1

one characteristic of crustaceans in common

Answer 1

two sets of antennae

Question 2

appendages are

Answer 2

biramous

Question 3

5 head appendages

Answer 3

1. antennules
2. antennae
3. mandibles
4. 1st maxillae
5. 2nd maxillae

Question 4

exopodite

Answer 4

jointer outer branch of appendage

Question 5

endopodite

Answer 5

jointed inner branch of appendage

Question 6

nauplius larvae form

Answer 6

head with 3 segments with appendages

Question 7

class malacostraca (5)

Answer 7

lobsters
shrimps
crabs
isopods
amphipods

Question 8

class branchiopoda

Answer 8

brine shrimp

Question 9

class branchiura

Answer 9

fish lice

Question 10

class cirrepedia

Answer 10

barnacles

Question 11

malacostracan tagmata

Answer 11

• head, thorax, and tail

- most have a carapace covering the head and thorax

Question 12

order decapoda (3)

Answer 12

lobsters, shrimps, crabs

Question 13

order mysidacea

Answer 13

freshw opossum shrimp

Question 14

order amphipoda

Answer 14

sand fleas

Question 15

order isopoda

Answer 15

wood bugs and marine kin

Question 16

order euphausiacea

Answer 16

krill

Question 17

decapod appendages

Answer 17

• 1st 3 thoracic appendages are maxillipeds

- remaining 5 are walking legs

Question 18

gill bailer funct

Answer 18

create a forward flow of w thru the branchial chamber beneath the carapace

Question 19

swimmerets

Answer 19

in lobsters, for swimming, repro

Question 20

uropods

Answer 20

in lobsters, for swimming, digging (telson)

Question 21

telson

Answer 21

digging and steering

Question 22

crab abdomen

Answer 22

much reduced and folded up under cephalothorax

Question 23

crab sex determination

Answer 23

thinner elongated lighthouse in males, wider more rounded in females

Question 24

lobster babies

Answer 24

direct development

Question 25

crab babies (2)

Answer 25

zoea larva and megalops larvae

Question 26

amphipod body (2)

Answer 26

- lack a carapace | - laterally flattened

Question 27

isopod body (2)

Answer 27

- dorsoventrally compressed | - lack a carapace

Question 28

pill bug resp

Answer 28

branching tubular structures called pseudo-trachea | - convergent evo w/ hexapods

Question 29

diff in carapace btwn mysids and euphausiacea

Answer 29

carapace in euphs is fused to all the thoracic segments and is short on the sides and doesn't cover the bases of the thoracic appendages

Question 30

branchiopoda feeding

Answer 30

filter feed

Question 31

branchiopod w

Answer 31

fresh

Question 32

sea monkeys

Answer 32

branchiopods

Question 33

ostracods resemble

Answer 33

bivalves

Question 34

copepods lack (2)?

Answer 34

gills | abdominal appendages

Question 35

branchiura body

Answer 35

dorsoventrally flattened

Question 36

branchiura attach to hosts via

Answer 36

maxillae modified suckers/hooks

Question 37

how do cirrepedia filter feed

Answer 37

using modified legs called cirri to sweep in particles

Question 38

2 features separating cirrepedia from other crustaceans

Answer 38

sessile as adults | hermaphroditic

Question 39

cirrepedia repro

Answer 39

large penis ferts neighbours; not open fert