Invert 1 - prelab, worksheet, review, chart

Invert 1 - prelab, worksheet, review, chart -...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Invertebrate
I
Pre‐lab.

Due
at
the
start
of
your
lab.

(pages
177­192)
 Name

 
 
 
 
 

GSI
&
Sect
#

 
 
 
 
 
Station
#
 
 
 
 The
remaining
labs
will
be
on
various
animal
phyla.

Note
unique
features
of
a
given
phyla
as
well
as
 ancestral
features
that
are
shared
amongst
several
phyla.

Focus
on
the
anatomy,
physiology
and
diversity
of
 each
of
the
phyla.

The
drawings
and
tables
are
guidelines
to
help
you
in
your
studies.

In
addition
you
should
 make
further
drawings.

Dissecting
equipment
will
be
provided
for
your
use.
 
 AT
THE
END
OF
EACH
LAB
IS
A
REVIEW
AND
A
CHART
THAT
YOU
SHOULD
FILL
OUT.
 
 1.

Define
the
following
terms.
 
 Protonephridia:

 
 
 
 Coelom:

 
 
 
 Ctenidia:
 
 Seta:
 
 
 
 Monoecius:
 
 
 
 
 2.

List
five
derived
molluscan
features.
 
 
 
 
 
 
 3.

Name
3
features
an
earthworm
and
a
clam
share.
 
 
 
 
 
 
 4.

Which
phyla
will
you
examine
in
this
lab?
 
 
 
 
 A57
–
Fall
2009
 
 Invertebrate
I
Notes
 A58
–
Fall
2009
 Invertebrate
I
Worksheet.

Due
at
the
end
of
your
lab.
 Name

 
 
 
 
 

GSI
&
Sect
#

 
 
 
 
 
Station
#
 
 
 
 The
required
drawings
and
tables
are
a
guideline
to
help
you
in
your
studies.

In
addition
you
should
 make
further
drawings
if
you
find
them
helpful.

Use
the
review
sheet!

Fill
in
the
invertebrate
1
charts.
 
 
 1)

In
the
left
circle
below
make
a
drawing
of
the
microscope
slide
of
the
Hydra,
include
labels:
mesoglea,
 epidermis,
gastrodermis,
tentacles,
gastrovascular
cavity,
basal
disc.
 
 Hydra
 
 
 
 
 
 Dugesia
 
 2)

Using
the
circle
above
and
to
the
right,
make
a
drawing
of
the
cross
section
of
Dugesia.

Include
labels:
 longitudinal
&
circular
muscles,
pharynx,
gastrovascular
cavity.

Be
sure
you
also
examine
the
whole
mount.
 
 
 3)

Did
you
check
your
review
sheet?

Have
you
filled
in
the
chart?
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Worksheet continued on the other side. A59
–
Fall
2009
 
 4)

Include
a
drawing
of
your
dissected
earthworm.

Label
internal
&
external
structures
(refer
to
page
A41
for
a
 review
of
structures).
 Label
external
structures:
mouth,
anus,
clitellum
 Label
internal
structures:
suprapharyngeal
ganglion,
pharynx,
esophagus,
crop,
gizzard,
intestine,
chloragogen
 tissue,
pseudohearts,
metanephridia,
septum,
esophageal
glands
(calciferous
glands),
seminal
vesicles,
 spermatheca
(seminal
receptacles),
ventral
nerve
cord,
ventral
blood
vessel.


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 5)

Make
a
quick
sketch
of
the
clam.

Label:
anterior
and
posterior
adductor
muscles,
ctenidia,
foot,
labial
palp,
 siphon
(incurrent
and
excurrent),
mantle,
and
viscera.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 6)

Look
in
the
marine
tank.
It
will
be
station
#30
on
lab
exam
2.
You
need
to
identify
all
of
the
organisms
that
 belong
to
the
following
phyla.
List
common
name,
class,
subphylum,
and
phylum
as
appropriate.
 
 
 Porifera:
 
 Platyhelminthes:
 
 Cnidaria:
 
 Annelida:
 
 Mollusca:
 A60
–
Fall
2009
 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
 
 INVERT
I Examples
 
 
 Symmetry Respiratory
system,

 pigments
 Circulatory
system
 
 
 Skeletal
system
 Coelom
 Degree
of
cephalization Sexual
reproduction
 
 Asexual
reproduction.
 Metamerism Excretory
system
 
 
 Metamorphosis
 
 Nervous
system
 
 #
of
embryonic
germ
 layers locomotion
 other
notes,
digestion,
etc.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Cnidarians Platyhelminthes Annelida Mollusca A62
–
Fall
2009
 ...
View Full Document

Ask a homework question - tutors are online