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Mollusks and Annelids (segmented worms) By Jason Ciardiello
Transcript of Mollusks and Annelids (segmented worms) By Jason Ciardiello
Mollusks and Annelids (Segmented Worms)
By: Jason Ciardiello and Brendan Daly
protected by a layer of mucus to allow to live in most areas
all of these mollusks reproduce sexually
They all have a central body cavity (coelom) around the heart
have a mantle cavity that functions to excrete gases and waste
They all contain a soft body containing a visceral mass, a foot and a mantle
some have gills to breathe
they are filter feeders (to catch very small edible particles that float in the water)
Characteristics of mollusks
two part shell
this group of mollusks are most of the seafood we eat today
to stay alive they attach to surfaces and don't wash away
they have a open circulatory system(the blood circulates within vessels, from the heart)
largest group of mollusks
have a singled layered shelled
have a radula that is a tongue like organ with rows of teeth to scrape food off surfaces
move by rhythmic contractions of the muscular foot.
has a open circulatory system(the blood circulates within vessels, from the heart)
are protected by a layer of mucus to allow to live in most areas
most complex mollusks
these include squid and octopus
cephlopod means head footed which means that they have a well devolved head
they are predators that feed on fish, crustaceans and worms
also have a well developed nervous system
have a closed circulatory system
(the blood circulates only inside blood vessels)
habitat of mollusks
they are all seafood
there would be a lot of businesses without money if we didn't have mollusks
humans are interested in this because we want to know about this food before we eat it
they live in fresh water and salt
live in areas except dry or cold areas
can live in temperate and tropical areas and moist
Why are mollusks important to us
Annelids (Segmented Worms)
There are three groups of Annelids
Marine worms (polychaetes)
they keep their skin moist by having a thin protective coating (cuticle)
they have bilateral symmetry
they have a body cavity that holds their organs
respire through skin
Earthworms are made up of different segments (more than 100) with four pairs of seate on each one except for the first and last segments.
They live in woods, fields and gardens in moist soil.
They have a clitellum which is a long, thickened segment that releases eggs and sperm.
They have a gizzard which is a muscular structure used to grind soil and organic materials.
niche relationships to other organism in there environment
leeches are considered parasites because they feed on other organisms
gastropods destroy the plants
flat worms and round they both live in other organisms like plants and animals (parasitic)
leeches also have a mutalistic relationship with humans because their saliva helps the wound of humans and repairs damaged skin earthworms are saprophytic to repair the soil
squids occupy the niche of carnivores (secondary consumers)
they have paripodia used for locomotion
includes sand worms and blood worms.
they live in all seas except for polar seas
evidence proves that annelids and mollusks have a common ancestry
they evolved 500 million years ago
they both have a body cavity
at the time they both lived in the water
both were long thin and had a mouth and anus in between a gut to digestive food
the annelids were originally a flat worm
we should care about earth worms because they help refresh plants
leeches are used for various medical purposes
Leeches feed on blood.
live in fresh water
they breathe through gills
They have two major muscle groups
Circular muscles and longitudinal muscles.
they produce an antiseptic when feeding so the host will not feel the leech.
why are humans interested in annelids
Thank you for watching our presentation.