How can we help?

You can also find more resources in our Help Center.

59 terms

Marine Science Unit 6: Marine Invertebrates

STUDY
PLAY
Kingdom Animalia
Organisms in this kingdom are all multicellular, have cells without cell walls and are all heterotrophic
Cambrian
Geologic time period when most invertebrate animal phyla appeared on Earth; occurred approximately 540 million years ago
Phylum Arthropoda
Phylum that includes crabs, shrimp, sea spiders, etc
Phylum Cnidaria
Phylum that includes jellyfishes, corals, sea anemones, and hydroids
Phylum Echinodermata
Phylum that includes seastars, brittle stars, sea cucumbers, sea urchins, and feather stars
Phylum Molluska
Phylum that includes clams, snails, nudibranchs, squids and octopuses
Phylum Porifera
Phylum that includes sponges
Blastula
A hollow sphere of cells formed during an early stage of embryonic development in animals.
Gastrula
The second stage in embryonic development in which the ectoderm, endoderm, and blastopore are established either by folding in of the blastula
Protostome
Animal whose blastopore becomes the mouth during development
Deuterostome
Animal whose blastopore becomes the anis during development (includes echinoderms and chordates)
Dorsal
Top or back of a bilateral animal
Ventral
Bottom or belly side of a bilateral animal
Anterior
Head region of a bilateral animal
Posterior
Tail region of a bilateral animal
Choanocytes
Flagellated cells within sponges that move water in and out of the animal
Sponges
Animal that lacks true tissue layers
Class Calcarea
Sponges with calcium spicules
Class Hexactinellida
Sponges with silica or glass spicules
Class Desmospongiae
Sponges with flexible sponging fibers
Cnidocytes
Stinging cells found only in cnidarians
Polyp
Sessile (nonmoving) body form of a cnidarian (anemone is an example)
Medusa
Motile (free moving) body form of a cnidarian (jellyfish is an example)
Epidermis
Outer tissue layer of a cnidarian
Gastrodermis
Inner tissue layer of a cnidarian
Class Anthozoa
Cnidarian class that includes sea anemones and corals
Class Scyphozoa
Cnidarian class that includes true jellyfish
Class Hydrozoa
Cnidarian class that includes hydroids
Class Cubozoa
Cnidarian class that includes box jellies
Phylum Annelida
Phylum that includes segmented worms
Class Gastropoda
Mollusk class that includes snails, slugs and nudibranchs
Class Bivalvia
Mollusk class that includes clams, oysters, and scallops
Class Cephalopoda
Mollusk class that includes squids and octopuses
Class Polyplacophora
Mollusk class that includes chitons
Mantle
Main body of a squid; responsible for making its shell (pen)
Tentacles
Two longer appendages of a squid
Arms
Eight shorter appendages of a squid
Siphon
Tube used by squids for jet propulsion
Phylum Arthropoda
Members of this animal phylum have segmented bodies, a chitinous exoskeleton, and jointed appendages
Chitin
Main component of the arthropod exoskeleton
Molting
Process where an arthropod sheds its exoskeleton in order to grow
Uropod
Tail fin of a crayfish
Telson
Middle part of a crayfish's tail
Abdomen
Muscular tail of a crayfish
Carapace
Shell that covers the body and head of a crayfish
Subphylum Crustacea
Arthropod subphylum that includes crabs, lobsters, and shrimp
Ventral Nerve Cord
Main feature of the arthropod nervous system
Pentamerous Radial Symmetry
Body symmetry exhibited by adult echinoderms
Phylum Echinodermata
Animal phylum that as the strongest ability to regenerate lost body parts
Water Vascular System
System of water filled canals used by echinoderms to move
Class Asteroidea
Echinoderm class that includes seastars
Class Echinoidea
Echinoderm class that includes sea urchins and sand dollars
Class Holothuroidea
Echinoderm class that includes sea cucumbers
Class Crinoidea
Echinoderm class that includes feather stars and sea lilies
Class Ophiuroidea
Echinoderm class that includes brittle stars
Phylum Chordata
Members of this animal phylum all possess a notochord, a dorsal nerve cord and pharyngeal gills slits at some point during their development
Subphylum Urochordata
Chordate subphylum that includes tunicates
Subphylum Cephalochordata
Chordate subphylum that includes lancelets
Subphylum Vertebrata
Chordate subphylum that includes animals with a backbone