Phylum Platyhelminthes, Nematoda and Mollusca

Question 1

Platyhelminthes Eukaryotic or Prokaryotic?

Answer 1

Eukaryotic

Question 2

Platyhelminthes Radiata or Bilateria?

Answer 2

Bilateria

Question 3

Platyhelminthes Dueterstomia or Protosomia?

Answer 3

Neither

Question 4

Platyhelminthes Pseudocoelomate, Acoelomate or Coelomate?

Answer 4

Acoelomate

Question 5

Platyhelminthes Triploblastic or Diploblastic?

Answer 5

Triploblastic

Question 6

Platyhelminthes Invertebrate or Vertebrate?

Answer 6

Vertebrate

Question 7

Phylum Platyhelminthes Class Turbellaria

Answer 7

Planaria – Dugesia free living – freshwater – marine – some terrestrial – ciliated body surface – three tissue layers – no coelom

Question 8

Phylum Platyhelminthes Class Monogenea

Answer 8

marine and freshwater ectoparasite – external/fishes – ciliated larva

Question 9

Phylum Platyhelminthes Class Trematoda

Answer 9

(flukes) – parasites – mostly vertebrates – two suckers attach to host – lifecycles frequently include intermediate and definitive (reproductive) hosts

Question 10

Phylum Platyhelminthes Class Cestoda

Answer 10

Tapeworms – attach with a scolex – proglottids produce eggs and sperms – no head or digestive system – life cycle includes one or more intermediate hosts

Question 11

Phylum Nematoda Eukaryotic or Prokaryotic?

Answer 11

Eukaryotic

Question 12

Phylum Nematoda Bilateria or Radiata

Answer 12

Bilateria

Question 13

Phylum Nematoda Dueterstomia or Protostomia?

Answer 13

Protostomia

Question 14

Phylum Nematoda Acoelomate, Pseudocoelomate or Coelomate?

Answer 14

Pseudocoelomate

Question 15

Phylum Nematoda Diploblastic or Triploblastic?

Answer 15

Triploblastic

Question 16

Phylum Nematoda Invertebrate or Vertebrate?

Answer 16

Invertebrate

Question 17

Roundworms

Answer 17

• Terrestrial, Aquatic and Parasitic
• Important decomposers – returning organic material to the ecosystem
• Pseudocoelom - not lined with mesentery
• Cuticle – protects parasite from digestive activity of host

Question 18

Phylum Mollusca Eukarytoic or Prokarytoic?

Answer 18

Eukaryotic

Question 19

Phylum Mollusca Radiata or Bilateria?

Answer 19

Bilateria

Question 20

Phylum Mollusca Dueterstomia or Protostomia?

Answer 20

Protostomia

Question 21

Phylum Mollusca Acoelomate, Pseudocoelomate or Coelomate?

Answer 21

Coelomate

Question 22

Phylum Mollusca Diploblastic or Triploblastic?

Answer 22

Triploblastic

Question 23

Phylum Mollusca Invertebrate or Vertebrate?

Answer 23

Invertebrate

Question 24

Mollusca

Answer 24

• Three tissues – torsion
• Calcareous shells – muscular foot
• Bilateral symmetry
• Unique feature – radula – lung
• Terrestrial and aquatic forms
• Sexual reproduction – exception; snails, slugs and nudibranchs (monoecious – hermaphroditic)
• Some feed on plants – some are filter feeders- some are carnivores

Question 25

Mantle

Answer 25

Mollusks have a special epidermal tissue that secretes its shell

Question 26

Radula

Answer 26

scraping tongue like organ – modified in the Cephalopods

Question 27

Molluscan Classes Polyplacophora

Answer 27

– commonly called Chitons sp.

• They are dioecious, marine mollusks
• External shell – 8 plates
• Ventral foot
• Reduced Head with mouth and radula
• Open circulatory system

Question 28

Molluscan Classes Gastropoda

Answer 28

• the snails
• Well developed head
• Muscular foot
• External shell in most (reduced/not present in the nudibranchs & slugs
• Radula and open circulatory system
• Most dioecious but land snails, nudibranchs and slugs tend to be monoecious
• Marine terrestrial & freshwater representatives

Question 29

Molluscan Classes Bivalvia

Answer 29

• Clams, muscles, scallops and oysters
• External shell – two halves
• Muscular foot
• Open Circulatory System
• Lack head and radula (filter feeders)
• Dioecious
• Inhabit Marine and Freshwater

Question 30

Cephalopoda

Answer 30

• Squids, octopuses and chambered nautiluses
• Well developed head - closed circulatory system
• Marine
• Head surrounded by grasping tentacles (2) – arms (8) - usually with suckers – eyes present
• Shell internal, external or absent
• Have a modified radula (beak)
• Locomotion by jet propulsion – muscular expelling water from tube formed by the mantel