Mollusca Flashcards
(25 cards)
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
