Phylum Arthropoda
Last Class: Arthropod Characteristics and Iron Man?
Last Class: Phylum Arthropoda
Arthropoda is the largest phylum in the animal kingdom
General arthropod characteristics:
Last Class: Phylum Arthropoda
Arthropoda is the largest phylum in the animal kingdom
General arthropod characteristics:
Joint
Joint
Joint
Tagmata: Specialized Body Sections
Head
Head
Torso
Thorax
Legs
Abdomen
Moulting
Once the soft body inside the exoskeleton gets too big
They need shed the exoskeleton and then make a new one
The Moulting Puzzle
How do crustaceans get the soft tissue of their huge claws through the tiny openings at the base when they moult??
Solution: They digest the soft tissue of their claws before they moult
Insects Vs. Crustaceans
Today: In depth Study of Arthropod External Anatomy
Last class we looked at the “general arthropod body plan
3 Tagmata: Head, Thorax and Abdomen
Today: In depth Study of Arthropod External Anatomy
Part 1: Identifying the general arthropod characteristics in a cricket
Today: In depth Study of Arthropod External Anatomy
Part 2: Identify general arthropod characteristics in a shrimp
Today: In depth Study of Arthropod External Anatomy
Part 3: Compare and contrast the anatomy between the two largest arthropod groups - crustaceans and insects
Head
Insects Have all of the general arthropod appendages
Crustaceans
Have all of the general arthropod appendages
Thorax
Cricket 3 segments
3 pairs of legs
2 pairs of wings
Shrimp
8 segments
5 pairs of walking legs
3 pairs of “thoracopods” modified to handle food
Abdomen
Cricket 11 segments
Only females have appendages (ovipositors)
Spiracles for breathing
Shrimp
6 segments + telson
5 pairs of swimmerets
1 pair of uropods
Uropods + telson = tail fan