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**(Ra'Shae) Scientist’s Notebook**


 * TITLE OF LESSON**

What do you have to investigate or figure out in this lesson that is related to the big idea? What will be the main question that will guide your learning? //What…, How…, Does… are good beginnings//
 * FOCUS QUESTION* (Big Idea)**

Crayfish Pre-lab Worksheet The following worksheet must be successfully completed before you start the actual dissection of the crayfish. **Introduction** 1. What phylum does the Crayfish belong?

2. Name two common characteristics crayfish share w/ annelids i. **cephalothorax** ii. **abdomen** 3. Name three differences crayfish have w/ annelids i. __ ii. __ iii. __ 4. To cut away the hard exoskeleton properly, what two tools are recommended: __ __ i. ___ __ ii. ___ __ **External Features** __ __ 5. The body is divided into two parts. Name them __ __ i. __ __ ii. __ __ 6. How many major limbs? __ 7. What are the pinchers called? _ 8. Identify these external features and describe their function/location: a. Cephalothorax __ b. Cervical Groove __ c. Abdomen __ d. Swimmerets __ e. Compound eye __ f. Rostrum __ g. Antenna __ h. Antennule __ i. Cheliped __ j. Uroped __ k. Telson __ l. Walking legs __ m. Maximilliped __ Name: ___ Date: _ __50 points possible__ __ **Internal Features** __ __ 9. Identify these internal features and describe their location, appearance and function: __ __ a. Brain __ b. Green gland __ c. Ventral nerve cord __ d. Cardiac stomach __ e. Pyloric stomach __ f. Intestine __ g. Digestive gland __ h. Ventral Nerve Cord _ i. Gills __ j. Anus __ k. Bladder __ **Beginning the Dissection** __ __ 10. After placing the specimen in the dissecting pan, what do you do next? __ _ 11. Describe the next cut you will do. _ 12. When you remove this part of the cephalothorax, what is exposed? 13. What is the chamber called that houses the gills? __ 14. Describe the water flow over the gills: __ 15. With the crayfish on the tray, dorsal side up, name three organs that will be visible once the carapace is removed? __,__ ___,__ _ __ 16. Describe your next set of cuts: ___ **Natural History** 17. Crayfish are active after sunset and before sunrise. What form of activity is this? __ 18. What does the crayfish normally feed on? ___ __ 19. Where are the eggs stored in the female? __ 20. How many eggs can normally be laid by the female?