echinoderms
Sea stars, urchins
Echinoderms are marine invertebrates with radial symmetry and a distinctive water-vascular system—a network of fluid-filled tubes that powers their movement.
The group includes starfish, sea urchins, sand dollars, and sea cucumbers.
The name comes from Greek for "spiny skin," which most members display: The tide pool was full of echinoderms clinging to the rocks.
Spiny spherical marine invertebrates
- sea cucumbersElongated marine echinoderms
- starfishFive-armed marine invertebrate
- brittle starsSpiny-skinned sea creatures
- sand dollarsFlat burrowing marine animals
Hydraulic locomotion appendages
- ossiclesMinute skeletal structures
- endoskeletonBody's inner framework
- calciteCrystalline calcium carbonate
- testEvaluative examination
spine · lantern · pyloric caeca · coelom
Of the sea bottom
- ocean floorUnderwater continental surface
- reefUnderwater rock or coral formation
- tidepoolCoastal rock hollow holding seawater
- intertidalZone between high and low watermarks
subtidal · deep sea · coral reef · kelp forest · sandy bottom · rocky shore · marine · abyssal
Biological self-repair process
- larvaeImmature metamorphosing creatures
- metamorphosisProfound biological restructuring
- spawningReleasing eggs to reproduce
- eviscerationRemoving internal organs
Major classification rank
- invertebratesAnimals without vertebral columns
- classificationSystematic grouping by traits
- phylogenyEvolutionary relationships among organisms
- genusTaxonomic rank above species
Extinct stalked echinoderm
- fossilizedMineralized organic remains
- extinctionComplete vanishing of a species
- paleontologyStudy of ancient organisms
- sedimentaryFormed from deposited material
sea urchins
Spiny spherical marine invertebrates
- sea cucumbersElongated marine echinoderms
- starfishFive-armed marine invertebrate
- brittle starsSpiny-skinned sea creatures
tube feet
Hydraulic locomotion appendages
- ossiclesMinute skeletal structures
- endoskeletonBody's inner framework
- calciteCrystalline calcium carbonate
test · spine · lantern · pyloric caeca · coelom
benthic
Of the sea bottom
- ocean floorUnderwater continental surface
- reefUnderwater rock or coral formation
- tidepoolCoastal rock hollow holding seawater
intertidal · subtidal · deep sea · coral reef · kelp forest · sandy bottom · rocky shore · marine · abyssal · seafloor
regeneration
Biological self-repair process
- larvaeImmature metamorphosing creatures
- metamorphosisProfound biological restructuring
- spawningReleasing eggs to reproduce
phylum
Major classification rank
- invertebratesAnimals without vertebral columns
- classificationSystematic grouping by traits
- phylogenyEvolutionary relationships among organisms
blastoid
Extinct stalked echinoderm
- fossilizedMineralized organic remains
- extinctionComplete vanishing of a species
- paleontologyStudy of ancient organisms
- living thingsplants, animals, animal, creature, birds
- invertebratesinvertebrate, arthropod, arthropods, mollusk, crustacean
- Cladesmammals, birds, reptiles, amphibians, insects
- seafloor lifesea cucumber, sea cucumbers, sea urchin, sea urchins, sand dollar
- animalscat, dog, bird, fish, cow
- vertebratesmammals, mammal, birds, bird, reptiles
echinodermsmollusks
Soft-bodied invertebrates, often shelled
crustaceans · arthropods · annelids · cephalopods · jellyfish