Mollusca: Cephalopoda

Question 1

synapomorphies (6)

Answer 1

Tentacles,

well developed eyes,

chitinous beak,

ink production,

siphon,

chromatophores- specialized skin cells that allow for
rapid color change

Question 2

body wall and support

Answer 2

Body wall: Muscular, flexible wall

Support: nautilus has an external shell, while others have a muscular
mantle or a pen

Question 3

locomotion and body cavity

Answer 3

Locomotion: jet propulsion

Body cavity: coelom

Question 4

feeding/digestion and circulation

Answer 4

Feeding: feeds using arms to capture prey

Digestion: complete digestive tract

Circulation: closed circulatory system with blood

Question 5

excretion and gas exchange

Answer 5

Excretion: nephridia which filters waste

Gas exchange: gills exchanges oxygen, and CO2 can be expelled through
the siphon

Question 6

nervous system (2)

Answer 6

cephalization with a developed nervous systems;

eyes

Question 7

reproduction and development

Answer 7

reproduction: external fertilization

Development: direct development

Question 8

habitat

Answer 8

Most are marine, ranging from surface to deep-sea environments

Question 9

fun fact (2)

Answer 9

Uses ink as sabotage,

cuttlefish and octopus can mimic