Phylum Echinodermata Flashcards
Phylum Echinodermata is divided into these classes
Class Asteroidea, Class Ophiuroidea, Class Echinoidea, Class Holothuroidea, Class Crinoidea.
Echinoderms have what type of symmetry?
Larva have bilateral symmetry but adults have radial symmetry.
Echinoderms have what unique vascular system? It’s functions?
A water vascular system for feeding, locomotion, respiration, and sensory perception
Echinoderms have ______ feet
Tube feet
Nervous system in echinoderms:
Nerve ring
What are Ossicles?
Spines or bumps that form a calcareous endoskeleton in echinoderms (bumps on the epidermis.
Echinoderms use _____ for gas exchange.
Gills
What is a Madreporite?
Controls the flow in or out of the echinoderms water vascular system.
Are Echinoderms Hermaphrodites?
No. They have separate sexes.
How long is a starfish’s digestive tract?
it is as long as the starfish is deep. The mouth is on the bottom of the central disk, anus is on the top.
Class asteroidean includes________
the sea star or “starfish” (tube feet with sucker
True or false: All members of Asteroidea can regenerate new bodies from a dismembered arm if part of the central disk is intact?
False. All members of Asteroidea can regenerate new arms, but only some can regenerate bodies.
What are the functions of the water vascular system?
Feeding, locomotion, respiration, and sensory perception
describe class Ophiuroidea
anorexic sea star with no suckers on tube feet
What is included in class Echinoidea?
Echinoids (Sea urchins and sand dollars)
