Lab Exam 4 Flashcards
main characteristics of phylum Echinodermata
-pentaradial symmetry
-dermal endoskeleton
-water vascular system
-all marine
-pincherlike pedicellariae
-dermal branchia
-lack a definitive head
-lack segmentation
-primitive nerve system with reduced sense organs
what kind of symmetry do echinoderms have
pentaradial symmetry
what kind of skeleton do echinoderms have
dermal endoskeleton
what kind of vascular system do echinoderms have
water vascular system
characteristics of echinoderm nerve system
reduced sense organs
are echinoderms deuterostomes or protostomes
deuterostomes
what characteristics do echinoderms, hemichordates, and chordates share
-deuterostomes
-enterocoelous coelom
-radial cleavage
-dermal endoskeleton
-bilateral symmetry (in larval stage)
classes of echinoderms
Class Asteroidea, Class Ophiuroida, Class Echinoidea, Class Holothuroidea
common name of class Asteroidea
sea stars
where do sea stars commonly live
rocky coastlines
what do sea stars feed on
snails, bivalves, crabs, corals, worms, and other echinoderms
do sea stars have many predators
no
symmetry of sea stars
pentaradial
characteristics of sea star arm
contain ambulacral grooves with tube feet and pedicellariae
characteristics of sea star tube feet
contain suction discs for gripping
where are the anus and madreporite on a sea star
the aboral surface
where is the sea star mouth
oral surface
basic sea star reproductive characteristics
dioecious with a bilateral bipinnaria larva stage
general sea star anatomy
central disc and 5 rays (arms)
what is the sea star epidermis covered by
numerous spines protruding through the skin from the endoskeleton, and dermal branchia
what are dermal branchia
skin gills
pediellaria location and function on sea stars
-around the spines
-used to keep the arboreal surface clean
sea star eyespot
located at the tip of each ray
-small, red
what is the sea star mouth surrounded by
large moveable oral spines
what is the madreporite used for in sea stars
to filter water into the water vascular system of echinoderms
what are the dermal branchia used for in sea stars
to absorb oxygen from the water
characteristics of coelomic cavity in sea stars
-inside the rays and central disc
-contains coelomic fluids which bathes the visceral organs
where is the pyloric stomach in sea stars
in the central disc
