Mollusca: Scaphopoda

Question 1

synapomorphies (5)

Answer 1

tubular,

tusk-shaped shell,

no gills,

captacula- tentacles
to grab food,

burrowing foot

Question 2

Body wall and support

Answer 2

Body wall: long, conical shell with a mantle

Support: shell and hydrostatic skeleton

Question 3

locomotion and body cavity

Answer 3

Locomotion: muscular foot to burrow

Body cavity: reduced coelom and hemocoel

Question 4

feeding/ digestion and circulation

Answer 4

Feeding: uses captacula to grab food into mouth

Digestion: complete digestive system

Circulation: reduced circulatory system with hemolymph

Question 5

excretion and gas exchange

Answer 5

Excretion: uses nephridia to filter waste

Gas exchange: diffuses oxygen across the mantle

Question 6

nervous system

Answer 6

reduced nervous system, using statocysts to balance

Question 7

reproduction and development

Answer 7

Reproduction: diecious with external fertilization

Development: indirect development with trochophore larva

Question 8

habitat

Answer 8

Marine benthic organisms

Question 9

fun fact

Answer 9

Tusk shells, as shells looks like elephant tusk