InvertebrateZooP2LEC30

Question 1

how many animal phyla is found so far?

Answer 1

35

Question 2

most animal species belong to the what clade?

Answer 2

Bilateria, which have bilateral symmetry and triploblastic development

Question 3

phylum Platyhelminthes

Answer 3

• acoelomate that live in water & damp terrestrial habitats

- flatworms, hammer head

Question 4

class Turbellarians

Answer 4

mostly marine planarians

Question 5

characteristics of planarians

Answer 5

• has head & eyes
• Gastrovascular cavity
• 1 cell thick
• simple, cut makes 2 head/tail

Question 6

class Trematodes

Answer 6

flukes that live as harmful parasites in other animals

Question 7

Class Cestoda

Answer 7

parasitic tapeworms that can be 60 feet long

-invade human stomach, use hooks to attach to digestive system

Question 8

phylum Rotifera

Answer 8

tiny animals that are one type of plankton

-Sea dragons eat them

Question 9

characteristics of Rotifers

Answer 9

• multicellular and have organs like ours
• they mate by hypodermic impregnation
• no male found, females reproduce by cloning (parthenogenesis)
• somehow swap genes with bacteria, fungi and even plants

Question 10

Phylum Bryozoans/Ectoprocts

Answer 10

-moss animals

Question 11

phylum Nemertea

Answer 11

• proboscis worms that feed on dead animals

- big as our head

Question 12

Phylum Mollusca

Answer 12

• lives in waters & deserts
• Includes snails, slugs, oysters, clams, and octopuses, squids
• have calcium carbonate skeleton like us

Question 13

what are the simple 3 body parts of molluscs?

Answer 13

• muscular foot
• visceral mass (sac of guts)
• mantle (organ that makes the shell & pearls)

Question 14

what does it mean for molluscs to be hermaphrodites?

Answer 14

both mates get pregnant

Question 15

Class Polyplacophora

Answer 15

chitons, marine animals encased in an armor of eight plates

Question 16

class Gastropoda

Answer 16

• contains three-quarters of all living mollusc species
• have a single, spiraled shell
  ex. land snail & seaslug/nudibranch

Question 17

class Bivalvia

Answer 17

• clams, oysters, mussels, and scallops
• shell divided into two halves
  ex. scallops that has blue eyes
• filter feeders

Question 18

Bivalves have what that has gills for feeding and breathing?

Answer 18

visceral mass

Question 19

class Cephalopoda

Answer 19

-squids & octopus
-all carnivores
-has beaks surrounded by tentacles of their
modified foot

Question 20

cephalopods facts

Answer 20

• octopuses are masters of disguise
• octopuses are among the most intelligent invertebrates
• cephalopods dominated oceans during Paleozoic, only nautilus survive today

Question 21

how many tenticles does octopus, squid, & natilus have?

Answer 21

• 8
• 10
• 60-70

Question 22

what are squids? how do they use their siphon?

Answer 22

-speedy carnivores with beaks & sharp eyes
-to fire a jet of water, which allows them to
swim very quickly