Download Chapter 33

Fig. 33-1
Fig. 33-2
Calcarea
and Silicea
Cnidaria
ANCESTRAL
PROTIST
Eumetazoa
Common
ancestor of
all animals
Lophotrochozoa
Bilateria
Ecdysozoa
Deuterostomia
Fig. 33-3-1
Placozoa (1 species)
Calcarea and Silicea (5,500 species)
0.5 mm
A sponge
Cnidaria (10,000 species)
A placozoan (LM)
Ctenophora (100 species)
A jelly
Acoela (400 species)
A ctenophore, or comb jelly
1.5 mm
Acoel flatworms (LM)
LOPHOTROCHOZOANS
Rotifera (1,800 species)
Platyhelminthes (20,000 species)
A marine flatworm
A rotifer (LM)
Ectoprocta (4,500 species)
Ectoprocts
Brachiopoda (335 species)
A brachiopod
Fig. 33-3-2
Cycliophora (1 species)
Acanthocephala (1,100 species)
100 µm
An acanthocephalan (LM)
A cycliophoran (colorized SEM)
Nemertea (900 species)
Mollusca (93,000 species)
An octopus
Annelida (16,500 species)
A ribbon worm
A marine annelid
ECDYSOZOA
Loricifera (10 species)
Priapula (16 species)
50 µm
A loriciferan (LM)
A priapulan
Fig. 33-3-3
Tardigrada (800 species)
Onychophora (110 species)
100 µm
Tardigrades (colorized SEM)
An onychophoran
Nematoda (25,000 species)
Arthropoda (1,000,000 species)
A roundworm
A scorpion
(an arachnid)
DEUTEROSTOMIA
Hemichordata (85 species)
An acorn worm
Echinodermata (7,000 species)
A sea urchin
Chordata (52,000 species)
A tunicate
Fig. 33-4
Choanocyte
Osculum
Flagellum
Collar
Food particles
in mucus
Choanocyte
Azure vase sponge (Callyspongia
plicifera)
Spongocoel
Phagocytosis of
food particles
Pore
Epidermis
Spicules
Water
flow
Amoebocytes
Mesohyl
Amoebocyte
Fig. 33-5
Mouth/anus
Polyp
Tentacle
Medusa
Gastrovascular
cavity
Gastrodermis
Body
stalk
Mesoglea
Epidermis
Tentacle
Mouth/anus
Fig. 33-6
Tentacle
Cuticle
of prey
Thread
Nematocyst
“Trigger”
Thread
discharges
Cnidocyte
Thread
(coiled)
Fig. 33-7
(b) Jellies (class
Scyphozoa)
(a) Colonial polyps (class
Hydrozoa)
(c) Sea wasp (class
Cubozoa)
(d) Sea anemone (class
Anthozoa)
Table 33-1
Fig. 33-9
Fig. 33-10
Pharynx
Gastrovascular
cavity
Mouth
Eyespots
Ganglia
Ventral nerve cords
Table 33-2
Fig. 33-11
Male
Female
Human host
1 mm
Motile larva
Ciliated larva
Snail host
Fig. 33-12
200 µm
Proglottids with
reproductive structures
Hooks
Sucker
Scolex
Fig. 33-22
Epidermis
Cuticle
Coelom
Circular
muscle
Septum
(partition
between
segments)
Metanephridium
Longitudinal
muscle
Anus
Dorsal vessel
Chaetae
Intestine
Fused
nerve
cords
Ventral
vessel
Nephrostome
Metanephridium
Clitellum
Esophagus
Pharynx
Giant Australian earthworm
Cerebral ganglia
Crop
Intestine
Gizzard
Mouth
Subpharyngeal
ganglion
Blood
vessels
Ventral nerve cord with
segmental ganglia
Fig. 33-23
Parapodia
Fig. 33-24
Fig. 33-15
Nephridium
Visceral mass
Coelom
Heart
Intestine
Gonads
Mantle
Stomach
Shell
Mantle
cavity
Mouth
Radula
Anus
Gill
Foot
Nerve
cords
Esophagus
Mouth
Radula
Table 33-3
Fig. 33-16
Fig. 33-17
(a) A land snail
(b) A sea slug
Fig. 33-18
Mantle
cavity
Anus
Mouth
Stomach
Intestine
Fig. 33-19
Fig. 33-20
Mantle
Hinge area
Coelom
Gut
Heart Adductor
muscle
Digestive
gland
Anus
Mouth
Excurrent
siphon
Shell
Palp
Foot
Mantle
cavity
Gonad
Gill
Water
flow
Incurrent
siphon
Fig. 33-21
Octopus
Squid
Chambered
nautilus
Fig. 33-29
Cephalothorax
Antennae
(sensory
reception)
Head
Abdomen
Thorax
Swimming appendages
(one pair located
under each
abdominal segment)
Walking legs
Pincer (defense)
Mouthparts (feeding)
Table 33-5
Fig. 33-27
Fig. 33-30
Fig. 33-31
50 µm
Scorpion
Dust mite
Web-building spider
Fig. 33-35
Abdomen Thorax Head
Compound eye
Antennae
Heart
Cerebral ganglion
Dorsal
artery Crop
Anus
Vagina
Malpighian
tubules
Ovary
Tracheal tubes
Mouthparts
Nerve cords
Fig. 33-37
Fig. 33-38
(a) Ghost crab
(b) Krill
(c) Barnacles
Fig. 33-39
Anus
Stomach
Spine
Gills
Central disk
Digestive glands
Madreporite
Radial
nerve
Ring
canal
Gonads
Ampulla
Podium
Radial canal
Tube
feet
Fig. 33-40
(a) A sea star (class Asteroidea)
(b) A brittle star (class Ophiuroidea)
(c) A sea urchin (class Echinoidea)
(d) A feather star (class Crinoidea)
(e) A sea cucumber (class Holothuroidea)
(f) A sea daisy (class Concentricycloidea)