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04CrayfishAnat - Crayfish Anatomy Huxley T H(1880 The...

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Crayfish Anatomy Huxley, T. H. (1880). The Crayfish: An introduction of the study of zoology , New York: D. Appleton. p. 41
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Objectives of Crayfish Anatomy and Paramecium Feeding Lab 1. Become familiar with anatomical terminology of position. 2. Understand the structure and location of crayfish appendages and organ systems. 3. Compare and contrast invertebrate body plan with that of vertebrate body plan. 4. Compare anatomy & physiology of a shrimp & amphipods to the crayfish 5. Visualize the digestion of yeast by Paramecium .
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Classic 1880 zoology text http://www2.biology.ualberta.ca/palmer/thh/crayfish.htm
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ANATOMICAL Directions Cranial (Anterior) / Caudal (Posterior) Dorsal / Ventral Lateral / Medial Proximal / Distal Superior / Inferior
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How does the organism’s structure aid its survival? – Support for body, anchor for muscles, protection – Modes of locomotion, sensory apparatus – Capturing food, ingesting, processing, expelling wastes – Obtaining O 2 , releasing CO 2 , supplying cells with nutrients, O 2 , CO 2 – Excretion of nitrogenous wastes
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Obtaining Energy C 6 H 12 O 6 + 6O 2 --> 6H 2 0 + 6 CO 2 + ATP
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Procambarus simulans Phylum: Arthropoda (jointed legs) – Bilaterally symmetrical, segmented Metazoan, somites with paired limbs, chitinous cuticle, limbs jointed to provide flexibility. Class Crustacea – Second and third segments bear antennae – Fourth bear mandibles – Subclass: Decapoda (“10 legs”)
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Segments Body contains 20 segments – Head & thorax (first 14 segments) are fused into carapace. Fusion complete on dorsal side. Segmentation visible on ventral side. – Cervical groove marks the boundary between head and thorax – Abdomen (6 segments)
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Crustacean appendages Jepson, M. (1942). Biological Drawings with Notes , London; John Murray.
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Head Segments (6 segments) Segment 1 -Compound eyes Segment 2 -Antennules Segment 3 -Antennae Segment 4 -Mandible Segment 5 -1st Maxilla Segment 6 -2nd Maxilla (bailers)
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Thorax Segments (8 segments) Segment 7 -1st maxilliped Segment 8 -2nd maxilliped Segment 9 - 3rd maxilliped (“central type”) Segment 10 -chelapeds (claws) (with gills) Segment 11 -1st walking legs (clawed with gills) Segment 12 -2nd walking legs (clawed with gills, female genital pore) Segment 13 -3rd walking legs (with gills) Segment 14 -4th walking legs (with gills, male genital pore)
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Segment 9 - 3rd maxilliped (“central type”)
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Abdomen Segments (6 segments) Segment 15- Swimmerets (male modified) Segment 16- Swimmerets (male modified) Segment 17- Swimmerets Segment 18- Swimmerets Segment 19- Swimmerets Segment 20-Telson/uropods
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Exoskeleton
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