Phylum Arthropoda Flashcards
Phylum Arthropoda is divided into 5 subphyla. What are they
Trilobitomorpha, Cheliceriformes, Myriapoda, Hexapoda, Crustacea
What is unique about the appendages of members of arthropoda?
they are the first up to this point to be jointed
The outermost layer of most arthropods is called _______ and is made of _______
exoskeleton made of chitin
What else uses chitin in their structural formations?
Fungi
exoskeletons allow for ___________
the attachment of muscles
In order to grow, arthropods must _____
molt their exoskeletons
What is unique about how arthropods are segmented?
they have fused segments
What kind of circulatory system do most arthropods have?
The Coelom is reduced into the Hemocoel which contains the Hemolymph.
What is Hemolymph?
a mix of blood and interstitial fluid.
What do aquatic arthropods use for excretion?
green glands
What do terrestrial arthropods use for excretion?
Malpighian tubules
What is unique about fertilization in arthropods that has not been seen up to this point.
Internal fertilization (this implies separate sexes)
are arthropods under lophotrochozoa?
no
arthropods have ___ germ layers. what does this imply?
- it implies that they have a tube in tube body, and have bilateral symmetry
are arthropods proto- or deuterostome?
protostome
being protostome implies that the embryo undergoes ______ or “________” cleavage.
spiral or determinate cleavage
what is indicated by the cephalization found in arthropods
well developed sensory organs
what do aquatic arthropods uses for respiration?
Gills
what do terrestrial arthropods uses for respiration?
most have internal systems (e.g. tracheas in insects)
What is the common name of subphylum trilobitomorpha
Trilobite
Where are trilobites found?
nowhere, they are extinct
Subphylum Cheliceriformes includes _______
horseshoe crabs, arachnids, sea spiders, ticks
What classes are Cheliceriformes divided into? what do those classes include
Class Merostomata (horseshoe crabs), Class Pycnogonida (Sea Spiders), And Class Arachnida (spiders, ticks, mites, harvestmen, & scorpions)
What is the defining characteristic of subphylum Cheliceriformes?
6 pairs of appendages
how are the 6 paired appendages unique to Chelicerformes arranged?
1st pair = chelicerae,
2nd pair = pedipaps
4 remaining pairs = walking legs
what are chelicerae? their function?
the 1st pair of appendages on a Chelicerforme. used for prey capture