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BIOL 111 Study Guide - Final Guide: Gastrointestinal Tract, Arthropod Eye, Arthropod


Department
Biology (Sci)
Course Code
BIOL 111
Professor
Suzanne Gray
Study Guide
Final

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Organism
Phylum Arthropoda Class Crustaceans Cladocerans Daphnia Magna
Brief
Description
Cladocereans are “water flies” and known for their jerky movement
Temperature
Daphnia are ectothermic, meaning they cannot self regulate
Therefore, there temperature fluctuates depending on the environment
around them
In temperate greater than 40 degrees Celsius, their proteins begin to
denature, therefore they can no longer function and die
Body
Structures
Compound eye: singular
Thoracic legs: 5 pairs, used for creating a water current and filter
feeding
Antennae: biramous form (a pair), used like oars for swimming
Digestive tract: C-shaped gut
Post abdominal claw: removes debris from under the carapace
Carapace: exoskeleton, molts
Heart: transparent pumping organ
Posterior spine: provides protection against smaller predators (spine
length increases, if predation rates increase)
Brood Pouch: sac at the end of the oviducts (contains 2-20 eggs)
1. Parthenogenisis: fertilization of an egg, withouth sperm
Favorable months = summer = only females produced
Prior to death, females molt a sac containing fertilized eggs
The eggs remain dormant until the spring
Females molt the sac with a hard protective layer
Respiratory
System
No gills, gas exchange occurs in the area under the carapace
Circulatory
System
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