BSC 2010L
INVERTEBRATES II
Principal Biological Concepts to
Emphasize:
A. Protostome vs. deuterostome.
B. Extremely diverse groups.
C. Terrestrial adaptations of Arthropods.
D. Serial homology.
E. Evolution of flight.
F. Metamorphosis.
G. Detailed anatomy of the crayfish.
Protostome vs. deuterostome.
A.
Mollusks and arthropods, as well as the
Annelids we looked at last week, are
protostomes.
1.
2.
3.
B.
Spiral and determinate cleavage
Blastopore (opening of the archenteron)
becomes the mouth
Schizocoelous formation of the coelom
We will look at deuterostome phyla next
week (Echinodermata and Chordata)
1.
2.
3.
Radial and indeterminate cleavage
Blastopore forms anus
Enterocoelous formation of coelom
Early embryonic development
Early development in protostomes and deuterostomes
Phylum MOLLUSCA
1.
2.
3.
4.
Class Polyplacophora - chitons
Class Gastropoda - snails, slugs
Class Bivalvia - bivalves
Class Cephalopoda - octupus, squids
Basic body plan of mollusks
A chiton
Garden snail
The results of torsion in a gastropod
Gastropods: Nudibranchs (top left and bottom left), terrestrial snail (bottom left), deer cowrie (bottom right)
A bivalve: Scallop
Anatomy of a clam
Cephalopods: Squid (top left and bottom left), nautilus (top right), octopus (bottom right)
Mussel heart xsec
prepared (no. 11-1)
Phylum ARTHROPODA
1.
Subphylum Chelicerata
a.
b.
2.
Subphylum Crustacea
a.
3.
class Merostomata - horseshoe crabs
class Arachnida - spiders, ticks, scorpions
class Crustacea - aquatic arthropods - shrimp,
lobsters, crabs, crayfish
Subphylum Uniramia
a.
b.
c.
class Insecta - flight
class Chilopoda - centipedes
class Diplopoda - millipedes
Lycosid spider
Arachnids. Scorpion (left), parasitic mites inhabiting tracheae of honeybee (right)
Horseshoe crabs, Limulus polyphemus
External anatomy of an arthropod
Insecta: beetle
Insect flight, dragonfly
Metamorphosis of a butterfly
Class Dipolopoda (millipedes)
Malpighian tubules of insects
Insect Malpighian tubules
prepared (no. 11-2)
Insect tracheae
prepared (no. 11-3)
Spider anatomy
Grasshopper external anatomy and
mouthparts
Anatomy of a grasshopper, an insect
Crayfish dissection
A. WORK IN PAIRS.
B. Photosheets are posted in lab.
C. Dispose of crayfish in metal barrels in
back of room.
Insect identification - slides and
dichotomous key.
A.
B.
You must identify five (5) insect orders
Hand this in before leaving lab as data sheet 2
(DS2 - 5 pts.)
1.
2.
3.
C.
D.
E.
Name
Slide box number
Slide number, insect order for each of 5 slides.
Key to insect orders
Don't share slide boxes.
For lab practical - Don't need to know orders or the
structures used in the key.
Suggest you view “33A
Characteristics of Invertebrates”
on Student Media CD-ROM for
review.
Lab practical in three weeks.
A.
B.
C.
D.
E.
F.
G.
H.
Sign up sheets available on-line beginning
Monday, October 10.
Review lab sessions - Saturday October 15 and
Sunday October 16.
Practical exams - Monday October 17 through
Wednesday October 19.
30 stations
1 question per station
60 seconds per station
NO GOING BACK
Practical covers labs 1, 4, 5 and 7, in roughly equal
proportions.