Mollusca Flashcards
1
Q
Head-foot: Functions
A
Feeding, sensory, locomotive organs
2
Q
Head
A
Well-developed with mouth and sensory organs
3
Q
Radula
A
Rasping, protrusible, tongue-like organ located in the mouth
4
Q
Foot: Functions
A
Adapted for locomotion and/or attachment
5
Q
Foot Modifications
A
- Bivalves: Laterally compressed foot
- Cephalopods: Funnel
6
Q
Visceral mass
A
Houses digestive, circulatory, respiratory, and reproductive organs
7
Q
Mantle
A
- Sheath of skin that wraps around each side of the body
- secretes shell
8
Q
Mantle cavity
A
Resp° organs + products of digestive/excretory/reproductive systems
9
Q
Circulation
A
- Mostly open circulatory system
- Closed in cephalopods
10
Q
Reproduction
A
- Sexual reproduction
- Mostly dioecious
- Produce free-swimming trochophore & veliger larvae
11
Q
Trochophore
A
Free-swimming ciliated marine larvae
12
Q
Veliger larvae
A
- Free-swimming larvae of most marine snails and bivalves
- Develop from trochophore larvae
- Has the beginning of a foot, shell, and mantle
13
Q
Classes
A
- Gastropoda
- Bivalve
- Cephalopoda
14
Q
Gastropoda:
* Examples:
* Environment:
* Form:
* Symmetry:
A
- Snails, slugs, whelks, conchs, periwinkles…
- Terrestrial or aquatic
- Many have shells
- Bilateral asymmetry due to coiling/torsion
15
Q
Bivalves
* Examples
* Environment:
* Form:
* Locomotion:
* Nutrition
A
- Mussels, clams, scallops, oysters, & shipworms
- Marine & freshwater
- No head or radula, some have simple eyes (ocelli)
- Mostly sedentary or sessile
- Sedentary filter feeders (draw water through gills by ciliary action)
16
Q
Cephalopoda:
* Examples
* Environment:
* Form:
* Nutrition:
* Locomotion:
* Unique adaptations:
A
- Squid, Octopus, nautilus, devilfish, & cuttlefish
- Marine
- Most don’t have shells (only Nautilus), some have internal shell called a pen
- Tentacles & arms to capture prey
- Swim by expelling jet of water from mantle cavity through funnel
- Chromatophores & ink sac
