Arthropoda Flashcards
Ecdysozoa
shedding organism
ecdysone
hormone that stimulates shedding
What is metamorphosis
changing shape brah
What does the sub phylum cheliceratea include?
arachnids, horse shoe crabs (merostomata), and sea spiders
what are the characteristics of chelicerata?
two tagmata, prosoma (head), opisthosoma(butt)
chelicerae(mouth fangs)
six pairs of appendages, four legs, chelicerae and pedipalps
What do chelicerae do
grab and stab
What are merostomata
a class of chelicerata
horse shoe crabs
What are arachnida and what do they include
a class of chelicerata
Includes spiders, scorpions, harvestmen, ticks & mites
pedipalps
good parents
What are pyncogonida and their characteristsics and what do they do
sea spiders
long legs and reduced bodies
marine
they eat soft invertebrates
what animals are in the myriopoda subphylum?
centipedes and millipedes
what are the classes of myriapoda?
chilopoda(centipedes) and diplopoda (millipedes)
what are the characteristics of chilopoda?
centipedes
mostly 1 leg per segemnt
terrestrial
flattened bodies
last segment has sensory function
first pair for poison claws
predators
What are the characteristics of Diplopoda?
millipedes
mostly 2 legs per segment
cylindrical
scavanegers
What classes are under the subphylum pancrustacea?
crustacea and hexapoda
What are the shared characteristics of crustaceans?
aquatic
cephalothorax
pleon
2 pairs of antennae
1 paid of mandibles
and 2 pairs of maxillae
one pair of appendages per tagmata
biramous appendages
What kind of circulatory system do crustaceans have?
open circulatory systems with haemolymph
the haemolymph fills the body cavity
is pumped by a heart in larger species
has haemoglobin or haemocyamin or oxygen transport
What is the crustacean lifecycle like?
most brood eggs
have larvae
undergo metamorphosis
What are the classes of crustacea
Maxillopoda, malascostraca, branchiopoda
What is the class Maxillopda composed of?
barnacles, copeopods and ostracods
Barnacle movement
They are the only sessile crucstaceans
their heads are stuck to the substrate and their legs “cirri” stick up
What are castrator barnacles?
eg. sacculina barnacles
they sterilise and feminise male crabs
female or male crabs tend to the barnacle eggs because the barnacles control their hormones.
the free swimming larvae of barnacles find and infect new crabs
What does the class malascostraca consist of?
crabs, lobsters, krill, prawns, crayfish, mantis shrimp, slaters, amphipods, and heaps more
have all the characteristics of crustaceans
What are the orders of malascostraca?
Decapoda, isopoda and amphipoda
What are the characteristics of decapoda?
10 legs (dec)
they are the ones we eat (crabs, lobsters, prawns)
only slightly terrestrial…
larval stages are strictly marine
