Mollusca: Monoplacophora

Question 1

synapomorphies (5)

Answer 1

single, cap-like shell,

multiple pairs of gills,

nephridia,

heart atria and muscles,

broad, creeping foot

Question 2

body wall and support

Answer 2

Body wall: soft-bodied with cap-like shell

Support: shell and hydrostatic skeleton

Question 3

locomotion and body cavity

Answer 3

Locomotion: uses foot to move

Body cavity: true coelom

Question 4

feeding/digestion and circulation

Answer 4

Feeding: feeds on detritivores and microorganisms using radula

Digestion: simple digestive system with a coiled intestine

Circulation: open circulatory system with blood

Question 5

excretion and gas exchange

Answer 5

Excretion: paired nephridia that removes waste

Gas exchange: multiple gills that absorbs oxygen

Question 6

nervous system

Answer 6

Nervous system: simple nerve ring; no eyes

Question 7

reproduction and development

Answer 7

Reproduction: diecious with external fertilization

Development: indirect development with a trochophore larvae

Question 8

habitat (2)

Answer 8

Deep-sea on the seafloor;

trenches and continental slopes

Question 9

fun fact (2)

Answer 9

May be the link between segmented ancestors and modern molluscs,

segmented organs