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characteristics
Pentaradiate symmetry
water vascular system
endoskeleton plates (ossicles)
Dermal brachiae
pedicellariae
function of aboral madreporite
water intake and exit to control volume in water vascular system
dermal branchaiae
cutaneous respiratory structures
pedicellariae
structure that clear debris from the skins surface
components of the endoskeleton and how does form follow function here
ossicles connected by “catch collagen” which is mutable (solid to liquid)
maintain posture with no additional effort
what are function of the water-vascular system
excretion
respiration
feeding
locomotion’’
sea stars eat?
carnivores; clams
unusual about the stomach
evert part of stomach into prey
reproduction
dioceous
external fertilization
asexual
cleavage of central disc
regeneration
autonomy (defense mechanism)
able to regenerate lost parts
yes
autonomy
losing body part as defensive mechanism
how are arms of the brittle stars different than those of asteroids
all organs found in central disc
unusual about some soft tested urchins?
brightly colored; not boney; deliver poisons
Aristotles lantern?
part of sand dollar; has teeth and muscles
primary diet of sea urchins
scrape off food; graziers
characteristic distribution of tube feet in some species of sea cucumbers
sole (well-developed); locomotion
how do sea cucumbers feede
tentacles come out, nutrients trapped; filter-feeding
unusual defense mechanism of sea cucumber
self - evisceration = respiratory trees come out so predators ear that then reproduce them
sea cucumbers involved in commensalism?
animals live inside cloaca (fish)
how is their life history different than most echinoderms (feather stars)
sessile and stalked dyring metamorphisis; free-moving adults
feeding method of feather stars
passive filter feeders
how is the water vascular system different in feather stars
multiple madreporic pores instead of just one
