INVERTEBRATES p.1
ORGANISM
Common name
Scientific name
examples
SPONGE
(Porifera)
“Pore-filled”
CNIDARIA
(Cnidaria)
“Stinging Cell”
Hydra or Jelly
FLATWORM
(Platyhelminthes)
Planaria
NERVOUS
BODY PLAN
Symmetry,
Tissue layers
Coelom?
?
____________,
______ tissues,
___body cavity.
Nerve net.
Allows for
coordinated
motion in one
direction.
_____?______
symmetry
?_tissue layers,
_?_ body cavity,
polyp and
medusa = (bell)
Nerve _____,
Planaria have
eye_____,
nerve clusters
in head.
ROUNDWORM
(Nematoda)
Ascaris
_____ ladder,
nerve clusters
in _______.
SEGMENTED
WORMS
(Annelida)
Earthworm, leech
Brain, ventral
nerve cord,
cluster of
nerves in each
segment.
LOCOMOTION/
Skeletal
Sessile/
Spongin,
Spicules
REPRODUCTIVE
Sexual: egg and sperm,
common release of
gametes into water.
“Baby” sponges freeswimming until settled,
then sessile.
EXCRETORY
Food-getting,
DIGESTIVE
CIRCULATORY
GAS
EXCHANGE
_____cytosis
_________feeders
or ______ feeders,
_________cytes or
collar cells trap food,
_______cytosis
_______cytes
?
Carnivores use
nematocysts
( ? = poison
harpoon) and
________ to subdue
and push prey into
________.
_________. cavity
____-filled
layer between
tissue layers
have
scattered
_________.
?
Simple________
tissue/
_____skeleton
Asexual by________,
Sexual: common release
of _________into water.
Waste exits
through_______,
____-way
digestive system.
___________
symmetry,
___body cavity.
____ for forward
motion, _______
to twist and turn.
Hermaphroditic:
Each individual has
______
____________________
but impregnates another
planarian.
Reproductive organs
take up nearly entire
interior of parasitic
flatworms. Repeated
units break off with
mature eggs.
Planaria: ___way system,
mouth serves as
anus.
Parasitic absorb
what is needed.
No need for
excretion.
Planaria: Two-way,
________________
cavity branches for
distribution,
_____-tube projects
from mid-ventral.
_________ &
____________ are
parasitic with
suckers & hooks:
scolex, no mouth.
?
diffusion
?
?
?
L____________
muscle
contraction
creates _______
motion /
______________
acts as a
hydroskeleton
C. elegans adult has
only_____ cells.
Development followed by
researchers. How _____
control development.
_____-way:
mouth to anus,
allows for
specialization,
increased
efficiency of
digestive tract.
Parasitic: have
cuticle to protect
from ________ ____
of host.
_________ intestine
secretes and mixes
with enzymes.
Posterior ___?____.
Absorption of
nutrients by
pseudocoelo
m distributes
?
?
?
?
segmented body.
Longitudinal +
______ muscles
work against
coelomic fluid:
______skeleton.
Bristles.
H____________: mate
with another. Easier to
locate “another” than 1 in
every two worms.
M________-secreting
organ.
Excretory organs
called________,
in each segment,
eliminate fluid
waste. Solid
waste called
_____________.
M__________,
C__________,
G__________,
I___________,
(continuous, not
segmented)
___________
System
Blood
remains
enclosed in
vessels.
__________
across
epidermis.
C_________
system
assists
diffusion.
INVERTEBRATES p.2
ORGANISM
MOLLUSC
(Mollusca)
NERVOUS
BODY
PLAN
X
Classes:
Gastropod:
snail
Bivalve: clam
“two folding
doors”
Cephalopod:
“head/foot”:
squid
ARTHROPOD
(Arthropoda)
“Jointed foot”
Head with
_______ on
tentacles
Crustacea
Arachnida
(chilicerates)
ECHINODERM
(Echinodermata)
“Spiney Skin”
Sea Star, Sea Urchin
?
Muscular foot,
M_______: “soft
body” most have
hard shell
secreted by the
___________.
Single, spiral
_____, retreat.
Slugs & sea slugs
have
_____________.
?
Nerve cords
_______ eyes
_____-part shell
Muscular ____.
______ brain,
sense organs,
_______ eyes
_________-jet
propulsion,
Directional _____
& tentacles
?, ?, ?.
Eyes, jointed
mouth parts
Classes:
Insecta
?
LOCOMOTION /
Skeletal
Antennae?
Antennae?
Antennae?
No brain,
Sea star has
_________ at
the tip of each
ray.
Embryonic
Arthropods all
have head,
thorax, abdomen.
All have _______
appendages,
___skeleton,
which must _____
for growth.
REPRODUCTIVE
EXCRETORY
Food-getting,
DIGESTIVE
Gills in
___________
_________.
R_______ = scrapes
food like algae
Lack
_______,
mantle lining
is lung-like.
Complete
___________
___________
is called a trochophore
_____________
Separate sexes
_____________
with specialization
along length.
Separate sexes
Internal fertilization,
Lay eggs
Complete
digestive systems
System
Gills
_____-like jaw,
radula.
_______
Complete digestive
systems
X
Complete and
_____________
metamorphosis, both
include molting
X
X
Adult has:
__________
__________.
___ pairs legs
X
X
X
X
Many spiders make
webs, scorpions
hunt at night and
use a poison barb to
____________ prey.
Anus on
dorsal?/ventral?
side of sea star
Uses __________ to
open shells. Mouth
on ________ side of
sea star, turns
stomach_________,
digestive enzymes,
absorbs jelly mass.
Larva:_________
symmetry;
Adults ______,
_______ tissue
layers,
_______ coelom
____ feet, water
vascular system, /
____skeleton.
spiny protrusions
from endoskeleton
give rough skin
X
Separate sexes. Can
___________ some
body parts, not asexual
reproduction.
_______
S________ feeders.
Gills absorb food too
Mucus + cilia
___ pairs legs,
most have ____,
___ pairs legs,
most have ____,
GAS
EXCHANGE
X
Adult has:
Head, ______
__________.
Adult has:
Head, ______
__________.
CIRCULAT
ORY
Open
circulatory
system, short
arteries with
spaces
surrounding
organs
Spiracles +
tracheae,
gills
Book lung
Diffusion from
__________
__________
___________
from pyloric
cecum