BIOLOGY Unit 9-Crayfish Notes

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Presentation transcript:

BIOLOGY Unit 9-Crayfish Notes

Chelipeds Appearance: Large pincher-claws Location: By the head. Function: Used to grab food.

Carapace Appearance: Hard, red shell Location: Outside body. Function: Protect delicate internal organs.

Swimmerets Appearance: Tiny feather-like legs Location: Belly-side Function: Help with swimming + grasping during sex.

Uropods & Telson Appearance: Fan-like tail Location: Rear end Function: Propel during swimming.

Mouth Appearance: Tiny lips  Location: Uhh…. The head (duh)…. Function: Uhh… eating…

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

Encephalon Appearance: Fleshy bit Location: Directly inside head, by eyes. Function: (Brain) Control all other organs + respond.

Green Gland Appearance: Fleshy Bits Location: 1 on each side of head behind eyes Function: Secrete enzymes needed to digest food.

Stomach Appearance: Fleshy Sack Location: In between Green Glands. Function: Grind up food (uses teeth-like structures).

Digestive Gland Appearance: Location: Function:

Heart Appearance: Light brown flap. Location: Behind stomach and digestive glands. Function: Pump + circulate blood across organs.

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

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

Gonads Appearance: Location: Function:

Male Parts Appearance: Tiny, bent legs Location: Belly Function: Insert sperm into female

Female Parts Appearance: Swollen hole Location: Belly, in between swimmerets Function: Take in sperm (like vagina)

Gills Appearance: White colored feathers Location: Sides of head, under shell. Function: Remove oxygen out of water for breathing.

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

External Dorsal:

External Ventral:

Sex: MALE FEMALE

External (Lateral):

Internal (Dorsal):

Deeper Internal (Dorsal):

Internal (Lateral)

Abdomen (Dorsal):