CRAYFISH DISSECTION Image from: http://www.mackers.com/crayfish/

ARTHROPODA “jointed foot” “Arthro” = “pod” = joint foot

NAMING CRAYFISH Kingdom: Phylum: CLASS: ANIMALIA Arthropoda “jointed foot” CRUSTACEA crusta = “flexible shell”

SEGMENTED BODY

TAGMA- pl TAGMATA Head + thorax = cephalothorax Fusion of smaller segments to make one bigger section Head + thorax = cephalothorax

http://biog-101-104. bio. cornell http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html EXOSKELETON- (flexible) made of CHITIN (polysaccharide) PROTEINS, LIPIDS, CALCIUM CARBONATE

CARAPACE Section of exoskeleton covering cephalothorax Image from: http://rcs.rome.ga.us/hargett/biology/arthpod/craydia.htm Section of exoskeleton covering cephalothorax

http://biog-101-104. bio. cornell 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

DECAPODS (10 legs) (4 pair walking legs + 2 chelipeds) 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

Appendages Walking legs Cheliped 3. Maxillipeds http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html Walking legs Cheliped 3. Maxillipeds 4. 2nd maxilla (gill bailer) 5. 1st maxilla 6. Mandible 7. Antenna Antennule

APPENDAGES ANTENNA Touch, taste ANTENNULE Touch, taste, equilibrium MANDIBLE Chew food MAXILLA Manipulate food Last pair “bailers”- Move water over gills MAXILLIPEDS Touch, taste, manipulate food CHELIPED Capture food, defense WALKING LEGS Locomotion, move water over gills SWIMMERETS Move water over EGGS, transfer sperm (males) carry young/eggs (females) UROPOD 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 CRUSTACEANS TROCHOPHORE BIPINNARIA 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

GILLS RESPIRATORY Exchange gases remove nitrogen waste (AMMONIA) http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/animals/crayfish.html Exchange gases remove nitrogen waste (AMMONIA) GILLS

Image from: http://faculty. clintoncc. suny. edu/faculty/Michael 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 Movie from: http://www.gsu.edu/~bioasx/heartbeat.html   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

DIGESTIVE 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

3. Digestive (hepatopancreas) gland. 4. adductor muscle 5. stomach 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 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