Bio Exam 4 Class 3 (Deuterostomes) Flashcards
all deuterstomes are also
bilateral triploblasts
deuterstomes are not as … as protostomes
neumerous
what forms first for deuterostomes
anus first
what are the two main groups of deuterstomes
echinodermata and chordata
what do echino derms include?
marine invertabrates (sea urchins. sea stars, sea cucumbers)
what are the 4 synapomorphies of echinoderms?
- pentaridal symmetry
- endoskeleton
- water vascular system
- tube feet
ehinoderm larva are… symmetrical.. adults are
bilateral,, pentaradial
some echinoderms have evolved an
exoskeleton
what does the water vascular system do for echinodems>
hydrostati skeleton
what do tube feet do>
help with movement and predation
what and how do echinoderms feed.
algae and prey on animals
- suspension feed or eat detritus
what are some of the ecosystem impacts of echinodermata>
ex. kelp forests
- sea urchins eat kelp
- otters eat urchins
- sea urchins then boomed everywhere which then deforested the kelp
- this leading of less o2 and carbon sequestration
what are chordates?
include two sub groups plus verbrates
what are the 3 froupd of chordates
cephalochordates
urochordates
vertebrates
what are the 4 synapomorphies of chordates
- pharyngeal gill slits
- dorsal hollow nerve chord
- notochord
- post anal tail
what are vertabrates?
a subgroup of chordates that share two additional synapomorphies
what are the 2 additional synapomorphies of vertabrates?
vertebrae
cranium