lecture 17 cephalopod

Question 1

What is class scapholopoda

Answer 1

tusk shells

Question 2

calss scapholopoda how many spp

Answer 2

500

Question 3

what is scapholopoda shell like

Answer 3

tubular, tapering shell open at both ends

Question 4

what does class scaphopoda lack

Answer 4

lack ctenidia and eyes and heart

Question 5

habitat of scaphopoda

Answer 5

buried in soft sediment

Question 6

what are captacula

Answer 6

very thin tentacles around scaphopod foot

Question 7

how is water moved in and out of mantle in scaphopods

Answer 7

via vilia

Question 8

what do captacula have?

Answer 8

sticky bulbous tips

Question 9

what do captacula do?

Answer 9

put organic shit in mouth

Question 10

how is food ground up scaphopoda?

Answer 10

internal radula

Question 11

fertilization in scaphopoda

Answer 11

external

Question 12

class cephalopoda

Answer 12

squids and shit

Question 13

how many spp cephalopoda

Answer 13

750

Question 14

characteristics of class cephalopoda

Answer 14

largest, fastest and most intellegent invertebrates

Question 15

cephalopoda shell

Answer 15

absent or reduced

Question 16

what is formed by the head and foot

Answer 16

arms, tentacles, cirri, and funnel

Question 17

what is the difference from arms and tentacles

Answer 17

arms have suckers along all their length
tentacles lack suckers only at the tips

Question 18

what are the appendages of nautiluses called?

Answer 18

cirri

Question 19

what is different about cirri

Answer 19

they are retractible into sheaths and they are non elastic, lack pads and suckers

Question 20

what is clade nautilida

Answer 20

excint mfs in cephalopoda

Question 21

what is Ammonoidea

Answer 21

extinct mfs in cephalopoda

Question 22

What is Coleoidea

Answer 22

contains octopodiforms and decapodiforms

Question 23

nautilus how many ctenidia

Answer 23

two pairs

Question 24

how many ctenidia extant groups excluding nautilus

Answer 24

one pair

Question 25

how is water moved in ctenidia in cephalopods

Answer 25

not cilliated, so water moved by muscular action of mantle

Question 26

decapodiforms circ system

Answer 26

closed circ system also have accessory pumps associated w ctenidia(branchial hearts)

Question 27

nautiluses shell

Answer 27

only cephalopod w external shell has septa and siphuncle

Question 28

siphuncle function

Answer 28

control buoyency

Question 29

shells in other cephalopods

Answer 29

reduced inside body

Question 30

internal shell cuttlefish vs squid

Answer 30

cuttlefish have calcareous cuttlebone squid have chitenous pen

Question 31

what extinct taxa had large external shell

Answer 31

ammonoids

Question 32

extinct squids that had hard internal shells

Answer 32

belemnoids

Question 33

what is funnel called and used for

Answer 33

siphon used for jet propulsion

Question 34

how do octopuses move

Answer 34

they crawl

Question 35

how do squids and cuddlefish move slowly

Answer 35

undulate fins

Question 36

what are the color changing cells in cephalopoda

Answer 36

chromatophores

Question 37

what are colour patterns used for

Answer 37

camouflage and social displays

Question 38

how do chromatophores worlk

Answer 38

the pigment in an expanded chromatophore is displayed

Question 39

what is ink used for

Answer 39

defense

Question 40

eyes in cephalopods

Answer 40

are image forming

Question 41

how do eyes work in cephalopods

Answer 41

retinal axons pass directly out of the back of the retina

Question 42

nautilus eyes

Answer 42

pinhole cameras

Question 43

cephalopoda diet

Answer 43

they are carnivores

Question 44

how do cephalopods eat shit they catch

Answer 44

it is bitten with beak and injected with venom

Question 45

what is beak made of

Answer 45

chitin

Question 46

what is the exception to carnivore cephalopods

Answer 46

vampire squid it eats detritus

Question 47

what type of development in cephalopoda

Answer 47

direct development

Question 48

how does copulation happen in cephalopods

Answer 48

spermatophores transfered via modified arm w groove

Question 49

how is the cephalopod embryo fed?

Answer 49

internal yolk supply

Question 50

what are some useful things about mullusca

Answer 50

shells used for decorations or currency pearls and pearl buttons dyes from snails aquarium trade most eaten out of invertebrates

Question 51

what are byssal threads used by us

Answer 51

sea silk

Question 52

how are molluscs important for parasites

Answer 52

intermediate hosts