Lab 7: invertebrates II Flashcards
phylum and clade for nematodes
phylum nematoda; clade ecdysozoa
habit for most round worms
free-living on land and in water
some are parasitic
roundworm body structures
- longitudinal muscle
- nonsegemnted pseudocoelomates
- cylindrical body covered by cuticle (exoskeleton)
which needs to be shed
why are roundworms related to arthropods if theyre unsegmented
common ancestor - ecdysozoa which refers to ecdysis (molting)
what kind of movement does longitudinal muscle allow
side-to-side thrashing
phylum for arthropods
phylum arthropoda
what is the most successful phylum
arthropoda (represented in all habitats)
main features of arthropods
segmentation
exoskeleton
jointed appendages
ancestral insect characteristics (6)
- wingless
- wings held out straight
- similar fore and hind wings
- mouth parts for biting and chewing
- direct development
- incomplete metamorphosis
derived traits for insects (6)
- winged
- folded wings
- different fore and hind wings
- mouth parts for lapping, sucking, or piercing
- indirect development
- complete metamorphosis
phylum for echinoderms
phylum echinodermata
characteristics of echinoderms
deuterostomes
radial symmetry in adult stage
tube feet
endoskeleton
why are echinoderms considered closely related to chordates
echinoderms: bilateral larvae
chordates: bilteral
phylum for chordates
phylum chordata
does phylum chordata include invertebrates
yes: two groups are tunicates (subphylum urochordata) and se lancelets (subphylum cephalochordata)
