Transcript Phylum Mollusca - The Salty Life

Funny mollusk song
http://www.youtube.com/watch?v=dEwnar
CYIO4&feature=related&safety_mode=tru
e&persist_safety_mode=1&safe=active
Did You Know?
1. Oyster Consumption
Another interesting fact about oysters is that nearly two
billion pounds of these mollusks are eaten every year,
and Americans eat their fair share. From 1990 to 1995,
for example, Americans ate about fifty million pounds of
these popular mollusks.
2. Is It a Male or Female Oyster?
Just like warm-blooded animals, oysters are either male
or female. But, oysters have gonads that generate eggs,
as well as sperm. So, oysters have the ability to change
their sexes, which they do, at least once.
4/2/12
The Octopus Show
What are chromatophores and why do they
use them? ___________________
What is the largest species of
octopus?______________________________
__
How many species of octopuses are
there?_____________________________
Can an octopus regenerate a lost tentacle
/arm? _________
What other animals can
do this? ____________________
Monday 4/2
Objective: I see one of the most intelligent
mollusks in action.
Agenda:
– Name voting
– The Octo. show
Homework: None
Did You Know
In Sweden there is a Christmas tree, also
known as a Yule tree which has root
system that has been growing for 9,550
years (sometime around the end of the Ice
Age). The actual offshoot of the tree is
only 600 years old.
Tuesday 4/3
Objective: I will know the basic
characteristics of a mollusk!
Agenda:
– Mollusk notes
– Mollusk group: if you want me to print
tomorrow is when I need to have a digital
copy!
Homework: Please tell LOLA hi on the way
out today
Phylum
Mollusca
Includes:
Snails-class Gastropoda
Clams-class Bivalvia
Octopuses, Squids-class Cephalopoda
There are more species of mollusks in the ocean
than any other group
Soft body protected by a shell of calcium
carbonate
Very diverse in body structures and habits
Mollusk Diversity
Biology
Much more complex than Cnidarians or
Sponges
Has a separate mouth and anus (1 way)
Has salivary and digestive glands
herbivores & carnivores (predators & filter
feeders)
circulatory system transports nutrients and
oxygen
Heart pumps blood to all tissues
Most have open circulatory system (leaky),
cephalopods a closed circulatory system
Nervous system simple to complex
Most have separate sexes
Some species are hermaphrodites
External fertilization- bivalves, chitons, & some
snails
– Sperm & eggs are released into water
Internal fertilization-cephalopods & most snails
– Cephalopods have modified arm to transfer
sperm to female
class Gastropoda
Snails-”stomach foot”
Largest group
Approx 90,000 species
Mostly marine
Body is coiled up inside shell
Shell sits on a ventral foot
Nudibranch
(sea slugno shell)
Tulip snail
(with shell)
Body Structure
Mantle
thin layer of tissue that produces the
shell
Foot
Head
muscular, used in locomotion
some are well developed & have eyes
Radula
Operculum
area with small teeth used in scraping
algae or other food from surfaces, made
of chitin
hard plate used to close opening once
head/foot retracts into shell
Gas exchange is through gills
class Bivalvia
Oysters (cement themselves
to hard surface)
Clams (burrow)
Mussels (attach to rocks
using byssal threads),
Body compressed between
two shells
class Cephalopoda-2 in to 30 ft
Cephalopods-most complex brain of all
invertebrates
– considered intelligent and capable of
learning
Most cephalopods display color changes
correlated to certain behaviors
Hectocotylus-Specialized arm transfers a
spermatophore (packet of sperm)
After eggs hatch female usually dies
Blue-ringed
Octopus
(Hapalochlaena)
giant pacific
octopus - Octopus
dofleini
Key Terms for Mollusks
Mantle
Siphon
Radula
Veliger
Cerata
Sepia
Operculum
Hectocotylus
Optional:
Give the
Find a memory
function and
device:
description of
acronym,
the listed terms. drawing, rhyme
Find terms in
etc…
Chapter
5 and notes.
When finished with the above terms answer questions 1-8
on page 5-43.