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) •S e g m e n t 7 -1st maxilliped •S e g m e n t 8 -2nd maxilliped •S e g m e n t 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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This note was uploaded on 03/22/2008 for the course BIO 206L taught by Professor Unknown during the Spring '08 term at University of Texas at Austin.

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

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