BIO EXAM 3 LEC 14 Flashcards
what are the earliest deuterostomes
echinoderms
echinoderms are
DEUTEROSTOMES
echinoderms live in
marine habiotats
echinoderms have
Water vascular system
water vascular system
locomotion, food / waste transportation
echinoderms show
evolutionary reversals
echinoderms evolutionary reversals:
radial symmetry, radial nerves (no CNS), little to no
cephalization, no excretory organs
echnioderms have what kind of body
triploblastic
echinoderms Endoskeleton contains millions of
calcium carbonate components called
ossicles
echinoderms have what for protection
spines, spicules
what kind of digestive system do echinoderms have
Complete digestive system
echinoderms have what kind of reproduction
asexual
echinoderms can regenerate
tissues
echinoderms body fluid circulation by
cilia
echinoderms blood vasular system is
reduced
how many classes are in the phylum echinoderms?
5
what are the 5 classes in echinoderms (Each-O)
Echinoidea
Asteroidea
Crinoidea
Holothuroidea
Ophiuroidea
asteroidea have
sea stars
echinoidea have
sea urchins, sand dollars
crinoidea have
sea lillies, feather stars
holothuroidea have
sea cucumbers
ophiuroidea
brittle stars
crinoidea mobility
move around till they find a place to stay then become sessile
ophiuroidea found in
benthic marine habitats
what kinda of feet do Ophiuroidea. have
tube feet
sea cucumbers characteristics(holothuroidea)
Sea cucumbers, 1150 spp.
- Greatly elongated in the oral-aboral axis
- Soft bodied
- Sea floor, beneath rocks, burrowing
- Bizarre defense mechanisms (morphological,
behavioral, and physiological defenses)
What are Ossicles?
They are spines/spicules (similar to sponges) that is used for protection
Ambulacral grooves
Give each arm their hardened structure
Why do sea stars undergo autotomy?
o protect against viruses, to escape predators, and for reproduction
benthic
Anything occurring or associated with the bottom of a body of water
What is the major difference between Brittle stars and sea stars?
Brittle stars have their madreporite located on the oral side of their body and sea stars have the madreporite located on the aboral side.
What is an example of a Behavioral defense mechanisms that Holothuroidea utilize?
burroe themselves
autotomy
self amputation