ecdysozoa Flashcards
what is an ecdysozoan
type of prostomes
animals that shed their cuticle
are bilaterally symmetrical
ecdysozoa clades
arthropoda tardigrada onychophora cephalorhycha nematodoa nematomorpha myriapods chelicarates crustatceans
ecdysis
moulting of cuticle for growth like in scorpions and priapulid worms
introvertan worms
priapulida (penis worm)
nematodoa (round worm)
loricifera and kinorhycha
what do all introvertan worms share
spiny introvert or probosics
tyblically have spines used for food
adult loricifera and larval priapulids share tunids
segmentation
repeated units of construction along anteroposterior axis
mechanism conserved in arthopods, vertebrates and annelids
homology of segmentation found in
annelids arthopods and chordates;
2 genes inolved in segmentation of all arthopods and annelids; same genes in vertebrae
hints of segmentation in SOME itnroverted worms in muscular and bone reptition
panarthopods
tardigrades and oncyhophorans (segementation and legs present)
tardigrades
waterbears
common
live in moss
segmentation and legs
oncyhophoans
velvet worms
sgemented bodies
limbs
less ridgid cuticle
arthopod classes
arachnids myriapods insects chelicerates orcyhophorans tardigraes crustaceans
crustacean examples
malacrustacean
maxillopod
branchiopods
arachnids
spiers scorpions tricks mites etc
chelicerates
horseshoe crabs sea spiders
common to arcahnids and chelicerates
8 walking legs
two pait of mouth parts
no preoral appendage
