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LEC 142: Zoology
Lecture 2: Overview of Animal Diversity: Primitive Animals
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Eubacteria
:
unicellular
, prokaryotic.
Archea
:
unicellular
, prokaryotic.
Protista
: uni/multicellular, eukaryotic,
photosynthetic.
Fungi
:
multicellular
, heterotrophic, not mobile.
Plantae
: multicellular,
photosynthetic
, not mobile.
Animalia
:
multicellular
, heterotrophic, mobile.
Kingdom Animalia:
Eukaryotic
, multicellular, no cell walls, cell differentiation,
sexual reproduction.
Body
Symmetry
: asymmetric, radial, bilateral.
Body cavities
: acoelomates, coelomates,
pseudocoelomates.
What does Phylum Porifera mean?
pore bearing.
Phylum Porifera
:
aquatic
, asymmetric, not true tissues/organs, mostly hermaphrodite.
what does phylum cnidaria mean?
stinging
phylum cnidaria
: aquaitc, radial symmetry, acoelomates, 2 cell layers.
examples of phylum cnidaria?
jellyfish
,
corals
, sea anemones.
coral reefs: form in shallow clear water
near equator.
what does phylum Platyhelminthes mean?
flat worms
phylum
Platyhelminthes
: free living aquatic or parasitic, bilateral, acoelomates, simple
mouth.
adaptations for a parasitic life:
size
and shape (small, flat) and
reduced sense organs.
adaptations
for a parasitic life: attachment organs and respiration (anaerobic)
adaptations for a parasitic life?
reproduction
(
asexual
)
Advantages of infecting secondary and tertiary hosts: increased
reproductive potential
, increased range of the parasite in
space
and time.