BIO044 (LECTURE) MOD 12 SUBPHYLUM MYRIAPODA Flashcards
Comprise about 80% of all known species of animals, making them the dominant animals on the earth.
Phylum Arthropoda
Phylum Arthropoda means
“joint-foot”
Phylum Arthropoda characterized with having a:
*Bilaterally symmetrical
* segmented body
* exoskeleton
Bilaterally symmetrical, segmented body, exoskeleton made with _______ a hard material made of protein, that can form protective plates around their body.
Chitin
Types of chitin
*Tergum
* Sternum
* Pleura
The chitin plates on the dorsal side of the body.
Tergum
The chitin plates on the ventral side of the body.
Sternum
The chitin plates on the lateral sides of the body.
Pleura
They posses a nervous system similar to annelids but have well-developed sense organ.
Phylum Arthropoda
They have open circulatory system and their blood called:
Hemocoel/hemolymph
They have a complete digestive system, and their mouth may have feeding appendages for either chewing, sucking, or lapping.
Phylum Arthropoda
Their respiratory may include:
Gills, trachea, or book lungs (because the organ is shaped like pages of a book)
For excretion, most anthropods release waste through the :
Malphigian tubules
This phylum is the largest group in the animal kingdom.
Phylum Arthropoda
Phylum Arthropoda is divided into 4 subphylums:
- Subphylum Chelicerata
*Subphylum Myriapoda - Subphylum Crustacea
- Subphylum Hexapoda
Include horsesea, crabs, spiders, Scorpions, ticks mites.
Subphylum Chelicerata
Includes all centipedes and millipedes.
Subphylum Myriapoda
Include crabs, lobsters, shrimps and crayfish.
Subphylum Crustacea
Comprises all 6-legged insects.
Subphylum Hexapoda
Their segmented body are divided into groups called:
Tagmata
Translates to “many feet”; they are the simplest living arthropods.
Myriapoda
Body is covered by hardened plates of ________.
Exoskeleton
Body is covered by hardened plates of exoskeleton made of both:
Chitin and calcium carbonate
Tagmatas (2)
*Head
* Segmented Trunk
Bears a pair of segmented antennae
Head
They are just made of 2 clusters of simple eyes called, which only detects light and dark.
Ocelli
Mouthparts are designed for chewing, consist of a pair of?
Prominent mandibles
Each segment may be dorsoventrally flattened(centipedes) or cylindrical (millipedes)
Segmented Trunk
Each segment has 1 or 2 pairs of jointed legs
Segmented Trunk
Each segment has well-developed and hardened tergum, but the sternum is weak and reduced called:
Tergites
Class Common name (Class CHILOPODA & class DIPLOPODA)
- Body
- Legs
- Defense
- Diet
Class CHILOPODA
Centipedes
Class DIPLOPODA
Millepedes
1st pair of legs are modified into:
Poisonous claws
Secrete toxins
Repugnatorial glands
Class CHILOPODA (Centipedes)
Carnivorous hunters
Class DIPLOPODA (Millepedes)
Herbivorous scavengers
Body- Dorsoventrally flattened(15-177 segments, but it’s always an odd number)
Class CHILOPODA (Centipedes)
Legs- Long legs; 1 pair per segment
Legs of 1st segment not for walking;
Last pair of legs has sensory function;
Fast and agile walk
Class CHILOPODA (Centipedes)
Body- Cylindrical )24-100 segments)
Class DIPLOPODA (Millipedes)
Legs- Short legs;2 pair per segment
When immature, only 1 pair has of legs per segment;
Slow and graceful walk
Class DIPLOPODA (Millipedes)
Exoskeleton is very hard and “____” when disturbed to protect it’s weak sternum.
“Coils”
Class DIPLOPODA (Millipedes)
