Written Phylum Mollusca Flashcards
1
Q
Molluscs are..
A
Soft-bodied, unsegmented animals
2
Q
They are typically bilaterally symmetrical BUT
A
Lost this symmetry because of coiling and with a Shell secreted by the mantle
3
Q
The body has THREE REGIONS
A
Head, Foot, and Visceral Mass
4
Q
Coelom is
A
Reduced
5
Q
The nervous system is
A
Ganglionic type
6
Q
Circulatory system
A
Lacunar (open type)
7
Q
The heart has
A
3 chambers
8
Q
Respiration happens through
A
Gills
9
Q
Which forms develop another type of respiratory organ?
A
Land Form
10
Q
- Have elongated, bilaterally symmetrical bodies.
- Mouth and arms are at opposite ends
- Head is devoid of appendages
- Shell is either absent or present (consists of 8 valves)
A
Chiton
11
Q
- has an elongated narrow body with the fins located along the aboral half of the trunk
- has a thin transparent pen made of horny material
A
Loligo
12
Q
- has a globose body
- without fins and without shell
- foot has eight arms with web and sessile suckers
- mantle is united to head
A
Octopus
13
Q
- rep. of the Class Gastropoda
- buried itself in the sand and exudes purple liquid when you step on it
- green in color
A
Dolabella
14
Q
- large handsome Shell
- spiral is on one plate cut successively into chambers by curved partitions
- inner surface is shiny, outer has wavy brown bands
A
Nautilus
15
Q
- thick shell
- spire is low
A
Cassis
