BIOLOGY Unit 9-Crayfish Notes

BIOLOGY Unit 9-Crayfish Notes

Crayfish PreLab 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 Appearance: Large pincher-claws Location: Anterior end; near the head Function:

Used to grab food and for defense Walking Legs Appearance: Long, thin legs Location:

Ventral (belly) side, mid section Function: Movement Swimmerets Appearance:

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

Uropods & Telson Appearance: Fan-like tail Location: Posterior (rear) end Function:

Propel during swimming. Mouth Appearance: Tiny lips Location: Front of head/anterior

Function: Eating, intake of food Maxillipeds Appearance: Tiny claws Location: Under head and

Chelipeds. Function: Bring food to mouth. Internal Structures Brain

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

responses. 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

Stomachs Appearance: Fleshy light gray sacks Location: In between digestive glands

Function: Grind up food (uses teeth-like structures). Heart Appearance: Light brown

lobe/flap. Location: Behind stomach + digestive glands Function: Pump + circulate throughout body

Intestine & Anus Appearance: Skinny tube + posterior opening

Location: Leaving stomach, going down back. Function: Absorb nutrients + carry waste out of body. Gills

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

--Dissection Notes-1. Lay crayfish on its belly. 2. Find carapace behind head. 3. Cut along lines + gently remove carapace. 4. Identify internal + external organs. Virtual Dissection

https://www.youtube.com/watch?v=2cBGu EDxvNo https://www.youtube.com/watch?v=wSGEt 1mY2OM Internal (Dorsal):

Deeper Internal (Dorsal): Internal (Lateral) Abdomen (Dorsal):

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