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Unformatted text preview: BSC 2010L – INVERTEBRATES II INVERTEBRATES Principal Biological Concepts to Emphasize: Emphasize: 1. 2. 3. 4. 5. 6. 7. 8. Protostome vs. deuterostome. Extremely diverse groups. Terrestrial adaptations of Arthropods. Serial homology. Evolution of flight. Metamorphosis. Detailed anatomy of the earthworm. Detailed anatomy of the crayfish. Protostome vs. deuterostome. Protostome • • • • Mollusks and arthropods, as well as the Mollusks Annelids we looked at last week, are protostomes. protostomes. Spiral and determinate cleavage Blastopore (opening of the archenteron) Blastopore becomes the mouth becomes Schizocoelous formation of the coelom • • • • We will look at deuterostome phyla in BSC We 2011L (Echinodermata and Chordata) 2011L Radial and indeterminate cleavage Blastopore forms anus Enterocoelous formation of coelom Early development in protostomes and deuterostomes Early Phylum MOLLUSCA Phylum • • • Class Gastropoda Class Bivalvia Class Cephalopoda Types of Molluscs Basic body plan of mollusks Basic Anatomy of a clam Anatomy Phylum ARTHROPODA Phylum • Subphylum Chelicerata 1. 2. class Merostomata - horseshoe class crabs crabs class Arachnida - spiders, ticks, class scorpions scorpions class Crustacea - aquatic arthropods class - shrimp, lobsters, crabs, crayfish shrimp, • • Subphylum Crustacea 1. Subphylum Hexpoda 1. class Insecta – flight Subphylum Myriapoda 1. class Chilopoda – centipedes 2. class Diplopoda - millipedes Spider anatomy Spider External anatomy of an arthropod External Anatomy of a grasshopper, an insect Anatomy Malpighian tubules of insects Malpighian Earthworm Dissection Earthworm 1. 2. 3. Study external anatomy first. Anesthetize in ETOH. Pin to one side of dissecting tray, Pin dorsal side up. dorsal 4. Study internal anatomy. 1. Small reproductive structures - ovaries, Small testes, vas deferens, oviduct, sperm funnels do not need to be found in the worms. Locate these only on the models - know their functions. functions. 5. Dispose of in trash. External anatomy of an earthworm External Anatomy of an earthworm Anatomy Metanephridia of an earthworm Metanephridia Crayfish dissection Crayfish 1. WORK IN PAIRS. WORK IN 2. Dispose of crayfish in BODY BAG. Insect identification - slides and dichotomous key. A. A. B. B. You must identify five (5) insect orders You Hand this in before leaving lab (5 pts.) Hand 1. 1. 2. 3. Name Slide box letter Slide letter and number, insect order for each of 5 slides. C. D. E. Key to insect orders Do not share the slide boxes. For lab practical – you don't need to know orders For or the structures used in the key. or A cerci elytra B F setae G cornicles C H D haltere I E furcula A cerci elytra B F setae G cornicles C H D haltere I E furcula Invertebrates II Scavenger Hunt 1. Complete the Inverts II scavenger hunt data sheet (pp. 237-238, 5 pts.) 2. Find answers on the display cards associated with the display specimens. 3. Do this work by yourself. 4. Turn this in before you leave lab. ...
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