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Transcript of Phylum Mollusca
largest phylum in the Animalia
200 000 spp. •Soft bodied
which may or may
not be protected
by a shell •Its body
systems specifically digestive, circulatory, respiratory, excretory, reproductive
systems •Eats by
vicious suction, drilling and poison darting, algal scraping and filter
STRUCTURE Head- contains
the mollusks mouth,
sensory organs Foot- variously modified for locomotion and attachment Visceral Mass- contains the internal organs Mantle- a thin, delicate tissue layer that covers most of a mollusk’s body Shell- made by glands in the mantle that secrete calcium carbonate (CaCO3) PHYLUM DIVISION Gastropoda “stomach-footed” Bivalvia
or “hatchet-footed” Scaphopoda (tusk shells)- “boat-footed” Cephalopoda “head-footed” Aplacophora “without plates/shells” Monoplacophora “bearing one plate” Polyplacophora (chitons) “bearing many plates” Rostroconchia
Helcionelloida are extinct classes REPRO
DUCTION/LIFE CYCLE ECOLOGY •Destroys certain ecosystems •Prey of small mammals •Helps in decomposing forest wastes •Keeps the
and healthy •Makes soil richer in nutrients •Bio
indicators Tridacna gigas (Giant Clam)
It could be found in the
Philippines and called
“taklobo.” The largest
specimen of Tridacna
gigas measured 54
inches and its shells
(only) weighed 230kg.
Syrinx aruanus (Australian trumpet or false trumpet)
-It is a species of extremely large sea snail measuring up to 910 mm long and weighing up to 18 kg in average.
Ammonicera rota has no common name and is the smallest known snail shell. It only measures 0.5 mm in average.