Bio1AL_Fa09_lab9_review -...

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Unformatted text preview: STUDENT
REVIEW
SHEET
INVERT
I
 PHYLUM
CNIDARIANS:
please
examine
the
demos
 A)
Hydra
 1)
external
structures:
polyp,
medusa,
ectoderm,
tentacles,
mouth,
cnidocytes
containing
nematocysts,
body,
 basal
disk,
buds,
testis,
ovary
(some
species
are
hermaphroditic
or
monoecious
(one
house
for
both
sexes)
 while
others
are
dioecious
(two
houses
for
both
sexes).
 
 2)
internal
structures
(longitudinal
section):
gastrovascular
cavity,
cnidocytes
containing
nematocysts,
 endoderm
(gastrodermis),
mesoglea,
food
vacuoles.
 
 PHYLUM
PLATYHELMINTHES:
please
examine
the
demos
 A)
Dugesia
 1)
external
structures:
ectoderm
(ciliated
epidermis),
cephalization,
pharynx,
pharyngeal
cavity,
mouth,
eye
 spots,
feeding
behavior.
 
 2)
internal
structures:
3
germ
layers,
ectoderm,
mesoderm
&
endoderm,
cephalization
(nerve
cords),
no
 coelom,
digestive
tract,
digestive
epithelium,

 
 PHYLUM
ANNELIDA:
please
examine
the
demos
 A)
Lumbricus
 1)
external
structures:
evidence
of
metamerism
=
segmentation,
setae,
mouth,
anus,
dorsal
blood
vessel,
 clitellum.
 
 2)
internal
structures:
true
coelom,
digestive
tract
=
mouth,
pharynx,
esophagus,
crop,
gizzard,
calciferous
 glands,
intestine
with

chloragogen
cells
and
a
typhlosole
(yellow
cells
surrounding
the
intestine,
and
an
 infolding
of
the
intestine
respectively
both
are
visible
in
the
cross
section
slides)
anus;
closed
circulatory
 system
=
ring‐like
hearts,
dorsal
blood
vessel,
closed
blood
vessels‐see
ventral
and
dorsal
blood
vessel
(in
 cross
section
slide);
excretory
system
=
nephridia,
(nephrostome,
optional);
reproductive
system
=
 hermaphroditic
(monoecious),
male
functioning‐‐testis,
seminal
vesicles
female
functioning‐‐ovaries,
 seminal
receptacles
(receive
&
store
sperm
from
another
individual);
nervous
system
=
supra‐pharyngeal
 ganglia,
ventral
nerve
cord
with
ganglia.
 
 3)
slides:
note
the
body
wall
with
cuticle,
epidermis,
circular
and
longitudinal
muscles.

Note
the
prominent
 digestive
tract
within
the
very
large
coelomic
cavity.

It
consists
of
several
structures,
note
in
particular
 chloragogen
cells
and
a
typhlosole
(yellow
cells
surrounding
the
intestine,
and
an
infolding
of
the
intestine
 respectively)
and
intestinal
epithelium.

Do
you
see
peritoneum?

Can
you
identify
the
ventral
and
dorsal
 blood
vessels?

Can
you
identify
the
ventral
nerve
cord?
 
 PHYLUM
MOLLUSCA:
please
examine
the
demos
 A.

Gastropods
 1)
external
structures
and
feeding
behavior
 B.

Freshwater
clam
 1)
external
structures/shell
structures:
hinge,
valves,
umbo
and
scars
of
adductors
(posterior
&
 anterior).
 
 2)
internal
structures:
mantle,
ctenidia,
anterior
&
posterior
adductors,
inhalant
&
exhalant
siphon,
 foot,
heart,
anus
 
 C. Squid, Loligo: Not dissected but you should be able to recognize these structures. 1) external structures: head, eyes, mouth, tentacles, mantle. 2) internal structures: pen (remnant of an internal shell). A61
–
Fall
2009
 ...
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This note was uploaded on 01/28/2010 for the course BIO biology taught by Professor Meighan during the Fall '09 term at University of California, Berkeley.

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