ecdysozoa Flashcards
ecydysozoa
perform ecdysis / shedding of the skin
arthropoda phylum
4
- most successful and abundant
- 3/4 of all living species
- jointed feet
- legs and some have wings
subphylum trilopita
6
- ancient arthropods
- they are cute and look like those egyptian bugs
- extinct for ~ 250million yrs
- exoskeleton
- fused segments
- branched appendages
subphylum chelicerata
- first pair of appendages – used for feeding
- lack mandibles and antennae
- chelicerea used for feeding
ex. horseshoe crabs, arachnids, and sea spiders
class merostomata
- from subphylum chelicerata
- book gills
- morphologically unchanged
- larger ferns
ex. horseshoe crab
horseshoe crab anatomy
- simple eye on top of their head
- compound eye on each side
- telson - tail for mobility
- cephalothorax
- pedipalp - longest legs on male
- book gills to breath (in abdomen)
carapace - shell-looking structure
class arachnida
- phylum chelicerata
- gas exchange through book lungs or tracheal tubes
- chelicerae was modified to fangs
ex. spiders, ticks, mites
spiders vs insects
spiders have 2 body regions + 8 legs
insects have 3 body regions + 6 legs
subphylum crustacea
7
- covered by carapace
- two segments
- exoskeleton !!
- gills
- antennae - touch and taste
- several legs
- biramous appendages (each leg has 2 joints)
ex. isopods, crabs, shrimps, lobsters, barnacles
crayfish anatomy
7
- antennule - small antenna near the mouth
- antenna - longer antenna
- carapace - neck-like structure
- claw
- walking legs
- swimmerets - smaller legs in the abdomen
- telson - leg
uropod
in the tail of the crayfish
rostrum
near the eyes of the crayfish
gonads
rep. organ
yellow ish, in the carapace
crayfish
mandibular muscle
after the eyes of a crayfish
gastric mill
found inside the stomach of a CRAYFISH
looks like teeth
are used to grind food
subphylum hexapoda
class insecta
most speciose and most ecologically dominant
- 3 pairs of legs
- body divided into 3 tagmata (head, thorax, and abdomen)
- sensory structures
- some have wings that outgrowths of the thoracic exoskeleton
- metamorphic development (two diff life styles - butterflies)
grasshopper dissection
- labrum - in the human’s nose region. guides food to mouth
- mandible
- maxillae
- palps - holds food in mouth
- abdomne
- thorax
- head
- spiracles (gas exchange)
- antennae
subphylum myriapoda
5
centipedes (chilopoda) and millipedes (diplopoda)
- one antennae
- mandibles
- hardened head capsule
- long segmented body
- uniramous (foldable leg)
chilopoda
- centipedes
- predators
- flattened body
- single pair of legs per body segment
diplopoda
millipedes
- detritivores - rotting plant material
- rounded body
- two pairs of legs per body segment
phylum nematoda
- extremophiles
- males have a round/hooked end
- some are parasitic (ascaris lumbricoides)
ex. roundworms
