Bio \Diversity Flashcards
protostome
the blastospore in the embryo becomes the mouth first
deuterostome
the blastopore in the embryo becomes the anus
sessile
anchored in one place, cannot escape predators
radial symmetry
symmetry around a central axis
bilateral symmetry
left and right halves are mirror images
cnidocytes
stinging cells on tentacles,
coelum
internal body cavity, space between digestive tract and body wall
nematocysts
cell with a barb attached
dioecious
male and female reproductive organs in different individuals
hermaphrodites
can have male production when conditions are bad and can self-fertilize
metamerism
true segmentation
setae/ chaetae
hairlike extensions on thin external cuticle
spiracles
small openings on the side of the body which allow air in
book lungs
looks like books on a shelf, provide a large surface area for gas exchange in arthropods
book gills
gills of the horse crab made up of membranous folds
pentaradial
five rays of symmetry: seen in starfish, Echinodermata, sea urchins
notochord
flexible rod-shaped structure thats found in the embryonic stages of all chordates, replaced by a vertebral column in vertebrates postnatal
dorsal hollow nerve chord
located dorsal to notochord, develops into the CNS
pharyngeal slits
openings in the pharynx that extend to outside environment
post-anal tail
tail containing skeletal structures and muscles, extends beyond anus
urochordata
tunicates, “tunic” composed of cellulose-like carbohydrate material. The adult form does not possess a notochord, dorsal hollow nerve chord, or post-anal tail, but the larvae do. Pharyngeal slits in both adult and larvae stage
cephalochordata
notochord extends into head, filter feeders in sand and warm temperate
craniata
organisms that have a cranium, jaw, and facial bones. Bilaterally symmetrical, include hagfish
vertebrata
display all 4 characteristics of chordates but have a vertebrae column, derived from the notochord
more closely related to lancelets than tunicates