Mollusca Flashcards
What organisms make up Mollusca
clams, oysters, mussels, scallops, chiton, cuttlefish, octopuses, squids, etc.
Environment
most aquatic, some terrestrial
Mollusca organisms body
soft body, and some closed by a calcium carbonate shell
Symmetry
Bilateral
digestive system
Complete
Body Plan
- Mantle
- Foot
- Visceral Mass
What is the mantle
clock over visceral mass; produces shell
What is the foot
muscular structure used for locomotion
What is the visceral mass
protection that holds the organs; digestive, excretory, reproduction systems
What are the five classes
- Polyplacophora
- Gastropoda
- Bivalvia
- Scaphopoda
- Cepholopoda
Class Polyplacophora
chiton
Class Gastropoda
snails and slugs
Class Bivalvia
clams, mussels, and scallops
Class Cephalopoda
Squid, Octopus, Cuttlefish, Nautilus
Class Scaphopoda
tusks, shells
Chiton Characteristics
herbivores; radula (grooves to scrape food), 8 overlapping plates above visceral mass
Tusk Shells Characteristics
Colonial, all look alike
Snails and Slugs Characteristics
3/4’s of all mollusks; mostly marine some terrestrial; crawl on foot; head, radula; herbivores; Slugs–> no shell, Snail–> has shell
Snails and Slugs Symmetry
Bilateral
Squid, Octopus, Cuttlefish, Nautilus Characteristics
marine; largest invertebrates; carnivores; good sense organs (make them good predators); foot= rings of suckers, tentacles, siphon
Circulatory system of mollusks besides Cephalopods
open circulatory system blood isn’t always enclosed
Circulatory system of Cephalopods
Closed, in vessels
Scallops, Oysters, Clams, & Mussels Characteristics
2 shells; no head; foot is not flat; open circulatory; filter feeders that clean waters
Class Bivalvia water flow (gill functions)
- creates currents
- gas exchange
- food collection
