Arthropods: Crayfish vs Grasshopper
Arthropod Investigation Jennifer Dong 4/2/14 GUZMAN-P7
Today's Objectives:
Students will examine two arthropods -- a crayfish and a grasshopper. After investigating the characteristics closely, students will be able to identify the similar phylum traits and the different class traits. Moreover, students will understand why grasshoppers belong to the class Insecta, while crayfish belong to the class Crustacea.
Crayfish vs. Grasshopper Habitat
Diet Comparison
Differences in Predators
Ecological Niche Synopsis
Ecological Adaptations Overview
Evolutionary Relationships of Crayfish and Grasshopper
Crayfish Specimen
Grasshopper Specimen
Investigating In Class
Grasshopper External Anatomy
Grasshopper Internal Anatomy
Grasshopper Respiratory System
Crayfish External Anatomy
Crayfish Internal Anatomy
Crayfish Respiratory System
The Respiratory System
Crayfishes breathe through gills located between the carapace, which is part of the skeletal system and the body wall. The gills are folded, which increases the surface area for oxygen in the water to diffuse into the blood and for carbon dioxide in the blood to diffuse out into the water. The circulatory system then plays the role of distributing this oxygen around the body.
The respiratory system of the grasshopper is called the tracheal system. Oxygen from the air diffuses into air filled tubes called tracheae and co2 diffuses out. Openings, called spiracles, allows the outside air to enter the tracheae, leading to finer tracheal tubes, and eventually extremely thin tubes called tracheoles. The spiracles are located on the thorax, which is part of the exoskeleton.
Scientific Classification
Crayfish
KINGDOM: Animal
PHYLUM: Arthropods
CLASS: Crustacean
ORDER: Decapods
FAMILY: Cambaridae
GENUS: Cambarus
SPECIES: Robustus
Grasshopper
Phylum Arthropoda
Subphylum Hexapoda
Class Insecta
Order Orthoptera
Suborder Caelifera
Family Acrididae
Subfamily Melanoplinae
Tribe Melanoplini
Genus Melanoplus
Species differentialis
Bonus Fun Facts...
-The first land animals were arthropods.
-Arthropods compose over three quarters of all known living things and fossils.
-Grasshoppers can jump 20 times their own body length.
-There are over 18,000 different species of grasshoppers.
-There are red, white, and blue colored crayfish species.
-350 out of the 500 species of crayfish thrive in the United States.
Human Impact
Citations:
http://animaldiversity.ummz.umich.edu/accounts/Cambarus/classification/#Cambarus
http://www.fcps.edu/islandcreekes/ecology/crayfish_(cambarus).htm
http://www.biologicaldiversity.org/news/press_releases/2014/slenderclaw-crayfish-04-07-2014.html
http://insected.arizona.edu/ghopperinfo.htm
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/T/Tracheal_Breathing.html
http://www.bugfacts.net/grasshopper.php#.U0XAYfldWSo
http://animals.about.com/od/arthropods/a/tenfactsarthropods.htm
https://www.johnston.k12.ia.us/schools/Lawson/Gradelevellinks/Crayfish/funfact.html
http://www.biologyjunction.com/grasshopper_dissection.htm
http://biology.unm.edu/ccouncil/Biology_203/Summaries/Protostomes.htm
http://www.eplantscience.com/index/general_zoology/images/images10/fig005.jpg
http://4.bp.blogspot.com/-13txWMG1mgk/UbVpkuEEgEI/AAAAAAAAAII/dEPuEBD3WSY/s1600/crayfish6.jpg
https://www.youtube.com/watch?v=LlipwN_5zlM
http://www.biologicaldiversity.org/news/press_releases/2014/slenderclaw-crayfish-04-07-2014.html
http://comparativeanatomybiology.weebly.com/grasshopper-anatomy.html