Phylum Anthropoda Flashcards
What is the largest phylum in animal kingdom
Anthropods
Largest phylum Bilateral symmetry Jointed appendages Sophisticated sense organs Exoskeleton
Characteristics of crustaceans
What are Anthropods skeletons made of?
Chitin
Can be tough or soft and flexible
Relatively impermeable to water
Flexible enough in joints to allow movement
Anthropod skeletons
What are the exoskeleton drawbacks?
Relatively heavy and it doesn’t grow with the animal so the animal must molt
Ecdysis
Molting
What happens during Ecdysis?
When the exoskeleton is ready, the animal contracts muscles and takes in air and water.
Animal swells until old exoskeleton splits usually along back
What is Ecdysis controlled and initiated by?
Controlled by hormones produced in the head
Initiated by changes in the environment
What are the 3 sections of the crustacean?
Head
Thorax
Abdomen
Sometimes the head and thorax fuse to form
Cephalothorax
How many pairs of walking legs?
5
What are the shorter antennas called?
Antennules
Anthropods have extensive cephalization…
Compound eyes
Sophisticated brain
Antennae detect changes
How do Anthropods respirate
Gills, tracheal system, book gills
What does the Anthropod nervous system contain?
Double ventral nerve cord
Anterior brain
Ganglia (control center for body)
Anthropods have what kind of circulatory system?
Open
Body fluid is called
Hemolymph
Anthropods have complete digestive tract that includes
Mouth, stomach, intestine, anus, and mandible
Mandibles open from
Side to side
What is the reproductive system like in Anthropods?
They are dioecious, they have internal fertilization, ostracods and Branchiopoda reproduce by parthenogenesis (eggs develop without sperm)
Subphylum Crustacea includes
Crabs, lobsters, etc.
Marine, freshwater and terrestrial
Fused cephalothorax
2 pairs of antennae
Crustacea
What are the classes within Crustacea?
Maxillapoda
Malacostraca
Barnacles and Copepods
Maxillapoda
Crabs, lobster, shrimp, krill
Malacostraca
Have flexible body plan that allows them to live in all biomes.
Anthropods
What are Copepods
Microscopic planktonic organisms
Important part of food web
Sessile
Cause problems to ships by increasing drag
Filter feeders
Barnacles
Largest group of crustaceans
Usually 8 legs, first 2 used for feeding
2 chambered stomach
Malacostraca
Crabs lobster shrimp
Decapoda
5 pairs of walking legs
First pair is modified to form chelipeds which catch prey and defend animal
Decapoda
Shrimp like animals that are filter feeders and feed on zooplankton
Most species are bioluminescent
Krill