Trivia
What is an Echinoderm that resembles a star?
Starfish
What is this Jeopardy about?
Echinoderms possess a brain.
False. Echinoderms have a decentralized nervous system with no brain. Instead, they have a central nerve ring and radial nerves.
True or False:
Echinoderm larva free swimming.
True
Where do echinoderms live?
Marine waters (Ocean)
What is the most common echinoderm?
Starfish
True or False:
Echinoderm larvae have bilateral symmetry.
True. The bilateral symmetry of echinoderm larvae is evidence of their evolutionary history and developmental process. The larvae undergo a metamorphosis to become radially symmetrical adults.
True or False:
Echinoderms have an exoskeleton.
False. Echinoderms have an internal skeleton, or endoskeleton, made of calcareous ossicles (calcium carbonate plates).
How many species of Echinoderms are there?
7,000
What symmetry do echinoderms have?
Radial
True or False:
All adult echinoderms exhibit radial symmetry.
True. While their larvae show bilateral symmetry, adult echinoderms are radially symmetrical.
True or False:
A sea star can regenerate a new body from a single arm, even if no part of the central disc is attached.
False. A separated piece of a sea star can regenerate a new animal only if it contains part of the central disc.
What is the least common Echinoderm?
Crinoidea
What symmetry do the larva have?
Bilateral
True or False:
Echinoderm larvae have a different body plan from adults.
True. Echinoderms undergo metamorphosis, with bilaterally symmetrical larvae developing into radially symmetrical adults.
True or False:
The water vascular system is unique to echinoderms.
True. The water vascular system, which uses water pressure to operate the tube feet, is a characteristic that sets echinoderms apart from all other animals.
How do echinoderms move?
A hydraulic system called the water vascular system
What does the word deuterostome come from?
The name comes from Greek and means "second mouth," referring to the defining feature of these animals' embryonic development.
True or False:
Sea lilies, or crinoids, are mobile, actively swimming echinoderms as adults.
False. While some can swim for short periods, many crinoids, especially sea lilies, are sessile as adults and are attached to the seafloor by a stalk.
True or False:
Sea urchins belong to the same class (Asteroidea) as sea stars.
False. Sea urchins belong to the class Echinoidea, while sea stars are in the class Asteroidea.