Transcript crayfish dissection - local.brookings.k12.sd.us

CRAYFISH
DISSECTION
Image from: http://www.mackers.com/crayfish/
ARTHROPODA
“jointed foot”
“Arthro” = joint
“pod” = foot
NAMING
Kingdom:
Phylum:
CLASS:
CRAYFISH
ANIMALIA
Arthropoda
“jointed foot”
CRUSTACEA
crusta = “flexible shell”
SEGMENTED BODY
TAGMA- pl TAGMATA
Fusion of smaller segments to make
one bigger section
Head + thorax = cephalothorax
http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html
EXOSKELETON- (flexible)
made of CHITIN (polysaccharide)
PROTEINS, LIPIDS, CALCIUM CARBONATE
CARAPACE
Image from:
http://rcs.rome.ga.us/hargett/biology/arthpod/craydia.htm
Section of exoskeleton covering
cephalothorax
http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html
CHELIPED
ROSTRUM
COMPOUND EYE
Antennae
Antennules
ANTENNAE- touch, taste
ANTENNULES- touch, taste,
& EQUILIBRIUM
http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html
DECAPODS (10 legs)
(4 pair walking legs + 2 chelipeds)
SWIMMERETS (5 pair)
Telson
Uropods
Image from:
http://www.spc.cc.tx.us/biology/jmckinney/Studyimages/crayfish/crayfishdissectlist.html
MANDIBLE
http://www.flushing.k12.mi.us/srhigh/tippettl/biology/cray/mandible.html
Mouthparts Mandible
Maxilla
Maxillipeds (3 pairs)
Image from:
http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html
http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html
Appendages
1.
2.
3.
4.
5.
6.
7.
8.
Walking legs
Cheliped
Maxillipeds
2nd maxilla
(gill bailer)
1st maxilla
Mandible
Antenna
Antennule
APPENDAGES
ANTENNA
ANTENNULE
MANDIBLE
Touch, taste
Touch, taste, equilibrium
Chew food
MAXILLA
Manipulate food
Last pair “bailers”Move water over gills
Touch, taste, manipulate food
MAXILLIPEDS
CHELIPED
WALKING LEGS
SWIMMERETS
UROPOD
Capture food, defense
Locomotion,
move water over gills
Move water over EGGS,
transfer sperm (males)
carry young/eggs (females)
Propulsion during tailflips
Is it a MALE OR FEMALE?
MALES:
first two pair
of swimmerets
form a channel
to transfer
sperm to female
seminal receptacle
Image from:
http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html
SEMINAL RECEPTACLE &
SWIMMERETS
Image from:
http://bioweb.uwlax.edu/zoolab/Table_of_Contents/Lab-7b/Crayfish_Sexes/crayfish_sexes.hm
Females “in berry”
carry developing embryos on swimmerets
http://crayfish.byu.edu/crayfish_biology.htm
REPRODUCTIVE
SEPARATE SEXES
Male and Female
EXTERNAL FERTILIZATION
sperm & eggs join outside body
INDIRECT DEVELOPMENT
Starts as a LARVA
INDIRECT DEVELOPMENT
MOLLUSKS
ECHINODERMS
TROCHOPHORE
BIPINNARIA
CRUSTACEANS
NAUPLIUS
Trochophore image: http://www.okc.cc.ok.us/biologylabs/Documents/Evolution/Trochophore_larva.htm
Nauplius image: http://www.micrographia.com/specbiol/crustac/copepo/cope0100/cycnaup1.htm
Bipinnaria image:
Examine the inside
of your crayfish
RESPIRATORY
http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html
GILLS
Exchange gases
remove nitrogen waste (AMMONIA)
Image from:
http://faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20102/Bio%20102%20Laboratory/
Protostomes/protostomes.htm
GILLS are attached to base of
walking legs.
Last pair of maxilla = “bailers”
& walking move water over gills
Image from: http://www.aa.psu.edu/div/mns/biology/crayfish/crayfishtable.htm
GAS EXCHANGE IN GILLS
INTERNAL
http://www.aa.psu.edu/div/mns/biology/crayfish/crayfishtable.htm
http://www.aa.psu.edu/div/mns/biology/crayfish/crayfishtable.htm
CIRCULATORY
Image from:
http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html
OPEN CIRCULATORY SYSTEM
HEART with openings (OSTIA)
ARTERIES leaving heart but NO VEINS to
return hemolymph
OSTIA
Image from:
http://www.quia.com/jg/265982list.html
Movie from:
http://www.gsu.edu/~bioasx/heartbeat.html
PYLORIC
CARDIAC
GASTRIC MILL
“teeth” inside stomach
3. DIGESTIVE GLAND
4. ADDUCTOR muscles move mouthparts
5. STOMACH
DIGESTIVE
Image from:
http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html
ABDOMEN
Image from:
http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html
2. Heart
3. Digestive (hepatopancreas) gland.
4. adductor muscle
5. stomach
Image from:
http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html
GREEN GLANDS collect and remove nitrogen
waste (AMMONIA) and excess water
Image from:
http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html
NERVOUS
VENRAL NERVE CORD
CEREBRAL GANGLIA
GANGLIA along body
Image modified from:
http://www.student.loretto.org/zoology/Graphic%20webs/Crayfish%20nervous%20system.htm
NERVOUS
Pair of nerves lead from
the ventral nerve cord
around the esophagus to
the large ganglion, or
brain, in the head.
Short nerves connect the
eyes, antennae, and
antennules to the brain.
http://www.flushing.k12.mi.us/srhigh/tippettl/biology/cray/ganganterior.html
COMPOUND EYE
http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html
Thousands of SENSORY HAIRS project from
exoskeleton over entire body sense vibrations &
chemicals