Phylum Mollusca - Cephalopoda Flashcards
what does this class include?
squids,cuttle fishes,nautilus
is radula present or absent?
present in the buccal cavity
“a pair of horny beak like jaws are present” true or false
true
shell is external and multi chambered in?
nautilus
shell is internal in?
sepia and loligo
shell is absent in?
octopus
shell of sepia is known as?
cuttle bone
shell of loligo is known as?
pen
foot is modified into 8 arms in?
octopus
foot is modified into 10 arms in?
sepia and loligo
ctaenidia,atria and nephrida are 2 in?
dibranchiates (sepia)
ctaenidia,atria and nephrida are 4 in?
tetrabranciates(nautilus)
circulatory system is opened or closed?
closed
is the nervous system well developed or not?
well developed with a brain enclosed in a cranium
monoecious or dioecious?
dioecious
is the development direct or indirect?
direct
examples of organisms under this class?
architeuthes,sepia and nautilus
what is the common name of architeuthes
giant squid
what is the common name of sepia
cuttle fish
octopus is also known as?
devil fish
which is the largest invertebrate?
architeuthes/giant squid