Phlyum Mollusca (K.3) Flashcards
Protostomes
Organisms that are first formed from the mouth
Foot
Structure used for locomotion (movement)
Mantle
Tissue that secretes the shell-building material
Visceral mass
Internal organs and tissues
Radula
“Tongue” of gastropods
Gills
Tissue used for gas exchange
Shell
Hard protective outer case
Open circulatory system
Blood flows freely throughout the body into spaces called sinuses
Sinuses
Cavities (sinuses include the chamber at the top of nostrils, openings to the heart and blood sinus in the foot of a clam)
Closed circulatory system
Closed loop system, blood isn’t free within a cavity. It remains in the blood vessels and heart at ALL times (I.e. humans)
Nephridia
Part of excretory system (expels liquid waste from body cavity to exterior)
Statocysts
Balance sensory receptor
Ocelli
Simple eye with one lens
Siphon
Two part tube that allows bivalves to bring water into their tissues and also remove water with waste from their tissues
Diecious
Having two separate sexes
Veliger larvae
Free-swimming larvae if many molluscs (have a basic shell and ciliated velum used for locomotion and feeding)
(3rd stage of a molluscs life cycle)
Keystone species
Organism that helps define a while ecosystem (without it the ecosystem would be altered or cease to exist)
Class Gastropoda
Gastro- stomach
Poda - foot
Stomach foot organism (I.e. single shelled - limpet, snail AND no shell - slug, nudibranchs)
Class Bivalvia
Bi - two
Valvia - leaves of a door (hinge?)
(i.e. clams, oysters, scallops, muscles)
Intertidal zones
Where ocean meets land between low and high tides
Nacre
Smooth hard surface that forms a layer within a shell
Broadcasters
Organisms that rely on the environment as a medium for distributing their gametes
Class Cephalopoda
Cephalo - head
Poda- foot
Head foot organisms (i.e. octopus, squid, cuttlefish fish)
Trochophore larvae
Small, translucent, free-swimming larvae (2nd form after zygote is formed)
