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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