Phylum Echinodermata and Chordata Flashcards
Phylum Echinodermata Unique Characteristic (classes asteroidea, ophiuroidea, echinoidea, holothuroidea)
water vascular system
Class Asteroidea Unique Characteristic (seastars)
arms ARE NOT sharply marked off from the central disk
Class Ophiuroidea Unique Characteristic (brittle stars)
arms ARE sharply marked off from central disk
Class Echinoidea Unique Characteristic (sea urchins, sand dollars)
compact skeleton with closely fitting plates
Class Holothuroidea Unique Characteristic (sea cucumbers)
cucumber-shaped, no arms or spine
Phylum Chordata Unique Characteristic (Subphylum’s urochordata, cephalochordata, and vertebrata)
notochord, post-anal tail
Subphylum Urochordata Unique Characteristic (tunicates or sea squirts)
only exhibit chordate features during larval stage
Subphylum Cephalochordata Unique Characteristic (lancelet- fish like filter feeder)
keep their notochord in adulthood
Subphylum Vertebrata Unique Characteristic (classes petromyzontida, chondrichthyes, actinopterygii, amphibia, reptilia, mammalia)
presence of vertebral column (backbone)
Class Petromyzontida Unique Characteristic (lampreys- jawless fish that have a toothed, funnel-like mouth)
funnel-shaped mouth lined with teeth
Class Chondrichthyes Unique Characteristic (sharks, rays, and skates)
endoskeleton entirely made of cartilage
Class Actinopterygii Unique Characteristic (bony fish- fish I’m familiar with)
find are supported by thin bony rays arranged like fan
Class Amphibia Unique Characteristic (frogs, salamanders)
moist, permeable and uncovered skin
Class Reptilia Unique Characteristic (turtles, crocodiles, lizards, snakes, and birds)
skin covered with structures of epidermal origin (scales, feathers)
Class Mammalia Unique Characteristic (monotremes, marsupials, eutherians)
mammary glands present
