Echinoderms Flashcards
Define echinodermata
Spiny skin
Where do echinoderms live?
Shallow coastal waters
Ocean trenches
What are examples of echinoderms
Sea stars
Brittle stars
Sand dollars
Sea cucumbers
Immature
Free swimming bilaterally symmetrical larva
Mature
Bottom dwelling with radial symmetry
Pentatadial symmetry
5 radi or múltiples of 5
Endoskeloton
Calcium plates, protruding spines possible
Tube feet
Movement, feeding, respiration, excretion
What systems do echinoderms not have?
Circulatory
Respiratory
Excretory
What does the nervous system miss in echinoderms
No head or brain
Dioecious
Reproduce sexually
Asexually
Regeneration
Class crinoidea
Lilylike
Can look like feathers
Examples of crinoidea
Sea lilies
Feather stars
Crinoidea fun facts
Sessile
Long stalks attach to rocks/ ocean floor
They eventually detach
Sticky tube feet
Where and what do the sticky tube feet do?
At the end of each arm catches food and aids in respiration
Class asteroidea
Star like
Examples of asteroida
Starfish
Sea stars
Where are sea stars found
Coastal shores world wide
What do sea stars eat
Oysters and clams
Class ophiuroidea
Snakelike
What is the largest class
Ophiuroidea
Examples of ophiuroidea
Basket stars
Brittle stars
Ophiuroidea fun facts
Thin brittle arms break off
Regenerates quickly
Ophiuroidea are what kind of eaters?
Scavengers- take food off ocean floor with arms and tube feet
How do ophiuroidea trap food?
With their mucous strands between their spines
Class echinoidea
Hedgehoglike
Examples of echinoidea
Sand dollars and sea urchins
Echinoidea fun facts
Compacted internal organs
Aristotles lantern
Barbs
Aristotle’s lantern
Complex jawlike mechanism used to grind their food= dorsal side
Barbs along spine
Protective maybe venomous
Example of class holothuroidea
Sea cucumbers
What type of body does a sea cucumber have?
Soft body
Feeding tentacles
Can regenerate
Class holothuroidea feeds by
Tentacles around the mouth sweep up sediment from the water
What special thing can sea cucumbers do?
Evisceration
Evisceration
Eject internal organs outside the body for protection
Aboral
Top of the body, surface
Oral
Mouth underside
Ossicles
Sharp protective spines made of calcium plates, covered with thin epidermal layer
Pedicellariae
Tiny forceps that protect and clean the body surface
Water vascular system
Hydrostatic pressure allows movement
In what flow does the water vascular system move
Madreporite to ring canal to radial canal
Ampulla
Bulblike sac connects to tube foot
Coelom
Fluid filled and distributes nutrients and oxygen
Dermal skin gills
Protect coelom lining
Nerve ring
Surrounds mouth and branches off into nerve cords in each arm
Eyespots
On each arm responds to light