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Chapter 30 and extras
Extras:
Mollusk
 Animal
Segmented
characteristics
Classification
of animal
kingdom
worms
Dissection info
Questions
1
2
Basic Animal Characteristics
Embryo Development are similar
Body plan : bilateral
radial
asymmetric
Animals must digest food
Animal Protection and support
Dehydration problem
3
Embryo Development
Stages of development
– sex cells fuse = zygote
– Blastula
– Gastrula
– ectoderm / mesoderm / endoderm
4
Frog development Movie
5
Chicken Development
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Body plan :
 Bilateral = Can be divided down its
length into similar right and left halves.
 Radial = Can be divided along any plane
through a central axis
 Asymmetrical = Irregular in shape
7
Animals must digest food
 Digestive systems.
– Food must be broken down after it is
consume
• Why????
– Digestive tract
• one opening (Planaria)
• two openings ( worm )
• organs that make digestive enzymes
8
Animal Protection and support
The larger the animal the more
support it needs
– Skeletal system give something for
muscles to attach to.
– Help maintain body shape
 Two kinds of support Endoskeleton /
exoskeleton
Terrestial Animals :
Water Problem
9
 Living on land creates the problem of
dehydration.
 Special organs, structures and
behaviors are required:
– Mucus
– Thick skin or layers
– Moist oxygen collectors (lungs)
– Water recycling organs
(intestine/rectum)
– Special egg containers
10
Important Technical terms
 Dorsal
 Caudal
 Ventral
 Transverse
 Cephalic
 longitudinal
 Cranial
 Proximal
 Anterior
 Distal
 Posterior
 Sagittal
11
Classification of animals
 Invertebrates
– Sponges
– Jellyfish
– Roundworm
– Mollusk
– Annelida
– Arthropods
 Vertebrates
– Agnatha
(hagfish)
– Sharks, Rays
– Bony Fish
– amphibians
– Aves (birds)
– Mammals
12
Mollusks and Segmented worm
What is a mollusk?
Where do Mollusks live?
Classes of Mollusks
What is a segmented worm?
13
What is a Mollusk
 Animals that are bilateral , have a coelom,
two body openings, a muscular foot for
movement and a mantle.
 Soft bodies composed of a foot, a mantle a
shell, and a visceral mass that holds all the
major organs
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What Mollusk have in Common
15
Origin of Mollusk
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Parts to Mollusk
Digestive system
Respiratory system
Circulatory system
Excretory system
Reproductive
system
Nervous system
Muscular/ Skeletal
systems
Protection
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Digestive System.
 Mouth
 radula
 esophagus
 Stomach (1)
 Caecum (2)
 Intestine
 See Overhead for details
18
Digestive system - 21933
Beak
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Respiratory system
Oyster Morphology
slide -21900
Squid Morphology
Slide -21910
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Circulatory system slide -
Open system ( blood bathe the organs )
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Brain - slide 21915/ 21941
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Reproductive system
 Male sex organs
 Female sex organs
 Copulation
 Lay Eggs
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Excretory system
 Diffusion in the visceral cavity
 anus / Intestine
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Protection
 Coloration
 water siphon
 Behaviors ( schooling)
 Ink Sac
25
Where do Mollusk live?
These animals are aquatic,
marine and terrestrial.
26
Classes of Mollusks
Classes are :
Gastropods - snails / slugs
Bivalvia- clams / oysters/ scallop
Cephalopoda- squid / octopus
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Gastropods -Snails (14456)
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Cephalopoda -Octopus
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Squids and Octopus
 Octopus
 Squid 14447
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Cephalopoda- Large Octopus
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What is a segmented worm?
32
Parts to Worm
Digestive system
Respiratory system
Circulatory system
Excretory system
Reproductive
system
Nervous system
Muscular/ Skeletal
systems
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Digestive system slide- 21888
Protomium
mouth
pharynx
esophagus
crop
gizzard
Intestine
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Respiratory System
• Respiration = diffusion through
the wet skin
• This restrict the over all size of
the animal.
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Circulatory System slide 21892
 Aortic Arches
Closed system
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Excretory System - worm
Since this is a terrestial animal liquid
waste is handled differently then solid
waste.
Solid waste is removed by the anus
Liquid waste is removed by the
NEPHREDIA
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Reproductive system
 Worms are hermaphrodites Male pores
Female pores
copulation
seminal vesicles
clitellum
egg sac
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Nervous system
Ventral Ganglia
Ventral nerve cord
pharyngeal ganglion (paired)
See Overhead
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Muscular system
 Circular muscle layer= causes the
sections to swell making the animal push
forward
 longitudinal muscle layers= pulls the
other sections forward
 Seta = provide traction in the soil
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Things to Know (100 words each)
1.How do each of the Dissected animals
acquire food and how do they process it?
2.How is breathing accomplished for each?
3.How do terrestial animals adapt to living
in a dry environment?
4.What special feature(s) makes each
successful?
Review material
41
 What features allow these animals to
become so large?
 Why is it important to have better senses
if you are larger?
 How do land animals adjust to dry
environments?
 Why is it important for these animals to
develop behaviors?
 Explain how these animals are like us.