Arthropod Overview Flashcards
Which two spiders that occur in the Sonoran Desert region are medically important, meaning their bite might cause a trip to the emergency room?
Arizona brown spider and black widow.
How long ago did arthopods first evolve?
At least 600 million years ago.
The periods between molts are called instars.
True or False
True
The exoskeleton is made of chitin.
True or False
True
The name arthopod comes from the Greek word for “joint” (artho) and “foot” (poda).
True or False
True
Arthopods have bones.
True or False
False
Most, but not all, arthropods are bilaterally symmetrical.
True or False
True
Arthropods account for approximately 85% of all know animal species on earth.
True or False
True
In order to grow, an arthropod must shed or molt its exoskeleton and form a new, larger one.
True or False
True
Invertebrates represent over 95% of all known animal species.
True or False
True
Bark scorpion stings can be dangerous for children.
True or False
True
Arthropods have left a very good fossil record.
True or False
False
Arthropods were among the earliest animals to evolve.
True or False
True
Metemorphosis is the life history that includes a transition in body form, such as a “larval stage” to adult.
True or False
True
Check the feature(s) all arthropods share.
___ Paired jointed legs
___ Segmented body
___ Exoskeleton
___ Body hairs
___ Cryptic coloration
_X_ Paired jointed legs
_X_ Segmented body
_X_ Exoskeleton
___ Body hairs
___ Cryptic coloration
The arachnids (subphylum Chelicerate, class Arachnida) comprise a diverse and complex group. Spiders, ticks, vinegaroons are all arachnids.
True or False
True
Check the reason(s) why arthropods are so diverse (i.e., why has the evolutionary radiation of this group been so spectacular)?
___ They have been around a long time (>500 million years).
___ Huge size range (100 microns to 3 meters).
___ Co-evolution with plants on land, and algae in the sea.
___ Flight.
___ Can occupy diverse niches.
_X_ They have been around a long time (>500 million years).
_X_ Huge size range (100 microns to 3 meters).
_X_ Co-evolution with plants on land, and algae in the sea.
_X__ Flight.
_X_ Can occupy diverse niches.
Match the term with the definition.
____ Invertebrate
____ Vertebrate
a. Animal without a backbone
b. Animal with a backbone
____ Invertebrate (a. Animal without a backbone)
____ Vertebrate (b. Animal with a backbone)
Match the subphyla (on extinct, four living) with the arthropods that occur in the Sonoaran Desert region.
__ Trilobitea
___ Crustacea
___ Hexapoda/Insecta
___ Myriapoda
___ Chelicerata
a. Centipedes, millipedes, etc.
b. Tarantulas, scorpions, mites, ticks, horseshoe crabs, etc.
c. 4000 species, extinct since the end of the Paleozoic (250mya)
d. Shrimps, crabs, barnacles, etc.
e. ants, silverfish, etc.
_c_ Trilobitea (4000 species, extinct since the end of the Paleozoic (250mya))
_d__ Crustacea (Shrimps, crabs, barnacles, etc.)
_e__ Hexapoda/Insecta (ants, silverfish, etc.)
_a__ Myriapoda (Centipedes, millipedes, etc.)
_b__ Chelicerata (Tarantulas, scorpions, mites, ticks, horseshoe crabs, etc.)
Match the invertebrate to its description.
_____ Centipedes
_____ Millipedes
a. Have one pair of legs/segment and are active predators.
b. Have two pair of legs/segment and are herbivores/detritivores.
c. Cylindral body, cryptic coloration
d. Flat body, aposematic coloration
_a__d__ Centipedes
_b__c__ Millipedes
a. Have one pair of legs/segment and are active predators.
b. Have two pair of legs/segment and are herbivores/detritivores.
c. Cylindral body, cryptic coloration
d. Flat body, aposematic coloration
Match the insect metamorphosis to its description.
_____ Hemimetabolous development
_____ Holometabolous development
a. Abrupt post-embryonic changes (=metamorphosis) in body form dramitic (e.g., larvae, pupae, etc.)
b. Gradual post-embryonic change in body form not dramatic.
c. 85%of insects undergo this type of development
d. 15% of insects undergo this type of develpment
_b__d__ Hemimetabolous development
_a__c__ Holometabolous development
a. Abrupt post-embryonic changes (=metamorphosis) in body form dramitic (e.g., larvae, pupae, etc.)
b. Gradual post-embryonic change in body form not dramatic.
c. 85%of insects undergo this type of development
d. 15% of insects undergo this type of develpment
