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Mollusca (Body (Mantle (A soft and spongy layer of skin forms a mantle…
Mollusca
Body
Organ system level
bilateral symmetry
triploblastic
coelomate
covered by calcareous shell
unsegmented
With distinct head, muscular foot and visceral hump
Mantle
A soft and spongy layer of skin forms a mantle over the visceral hump.
The space between the hump and the mantle is called the mantle cavity.
The mantle cavity contains featherlike gills with respiratory and excretory functions.
Examples
Pila
(Apple snail)
Pinctada
(Pearl oyster)
Sepia
(Cuttlefish)
Loligo
(Squid)
Octopus
(Devil fish)
Aplysia
(Sea hare)
Dentalium
(Tusk shell)
Chaetopleura
(Chiton)
Life processes
Respiration
feather like gills
Excretion
feather like gills
Sensitivity
sensory tentacles
Anterior head region
Nutitrion
Radula
Mouth contains file like rasping organ for feeding
Reproduction
usually dioecious
Usually oviparous
indirect development
MISC.
2nd largest animal phylum
Habitat
terrestrial
aquatic
Marine
fresh water