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Crayfish Pre-Lab

Crayfish Pre-Lab. External Structures. Carapace. Appearance: Hard outer shell Location: Exterior of the body Function: Tough exoskeleton made of chitin; protects internal organs. Antennae. Appearance: 2 long stalks Location: Front of head. Function: Sensory reception. Chelipeds.

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Crayfish Pre-Lab

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  1. Crayfish Pre-Lab

  2. External Structures

  3. Carapace • Appearance:Hard outer shell • Location:Exterior of the body • Function:Tough exoskeleton made of chitin; protects internal organs

  4. Antennae • Appearance:2 long stalks • Location:Front of head. • Function:Sensory reception.

  5. Chelipeds • Appearance:Large pincher-claws • Location:Anterior end; near the head • Function:Used to grab food and for defense

  6. Walking Legs • Appearance:Long, thin legs • Location:Ventral (belly) side, mid section • Function:Movement

  7. Swimmerets • Appearance:Tiny feather-like legs • Location:Ventral (belly) side near posterior • Function:Help with swimming + grasping during mating

  8. Uropods & Telson • Appearance:Fan-like tail • Location:Posterior (rear) end • Function:Propel during swimming.

  9. Mouth • Appearance:Tiny lips • Location:Front of head/anterior • Function:Eating, intake of food

  10. Maxillipeds • Appearance:Tiny claws • Location:Under head and Chelipeds. • Function:Bring food to mouth.

  11. Internal Structures

  12. Brain • Appearance:Fleshy piece • Location:Directly inside head, by eyes. • Function:Controls organs + responses.

  13. Digestive Glands • Appearance:Light yellowish masses • Location:1 on each side of head behind eyes • Function:Secrete enzymes needed to digest food. Also called “green glands”

  14. Stomachs • Appearance:Fleshy light gray sacks • Location:In between digestive glands • Function:Grind up food (uses teeth-like structures).

  15. Heart • Appearance:Light brown lobe/flap. • Location:Behind stomach + digestive glands • Function:Pump + circulate throughout body

  16. Intestine & Anus • Appearance:Skinny tube + posterior opening • Location:Leaving stomach, going down back. • Function:Absorb nutrients + carry waste out of body.

  17. Gills • Appearance:White colored feathers • Location:Sides of head, under shell. • Function:Gas exchange (oxygen and CO2).

  18. --Dissection Notes-- • Lay crayfish on its belly. • Find carapace behind head. • Cut along lines + gently remove carapace. • Identify internal + external organs.

  19. Virtual Dissection… • https://www.youtube.com/watch?v=2cBGuEDxvNo • https://www.youtube.com/watch?v=wSGEt1mY2OM

  20. Internal (Dorsal):

  21. Deeper Internal (Dorsal):

  22. Internal (Lateral)

  23. Abdomen (Dorsal):

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