sponges and cnidarians
DESCRIPTION
Sponges and Cnidarians. Sponges. Sponges Intro. Origin. Evolution: believed to have evolved from protists Collar cells: are almost identical to many flagellated protist cells Uses of collar cells: Move water, ingest food and excrete waste. Sponges Intro, cont. Diversity. - PowerPoint PPT PresentationTRANSCRIPT
Sponges and
Cnidarians
Sponges
Sponges Intro.
OriginEvolution: believed to have evolved from protists
Collar cells: are almost identical to many flagellated protist cells Uses of collar cells:▪ Move water, ingest
food and excrete waste
Sponges Intro, cont.Diversity
Species #: 8300
Variety: 3% live in
freshwater Variety of
shapes, sizes and colors
Live at a variety of sea depths
Characteristics of SpongesKingdom Animalia
Phylum PoriferaThey are mostly marine (live in salt water)
# of cells: multicellular (eukaryotic)
Body contains pores, canals and chambers that allow for water flow
Characteristics of Sponges
Symmetry: radial No definite head regionInterior surface: lined with collar cells (choanocyte) Choanocyte:
▪ a flagellated collar cell that lines the inner surface (mesophyll) of sponges
ChoanocyteBeating flagella
Create water current
Capture food and water particles
Carries away waste
ChoanocyteCollar is made of microvilli Why? To create a filtering device to collect food
ChoanocyteThe food particles then become trapped How? Taken in by the food vacuoles (where they are stored and digested)
Actual Choanocyte at work
Food and Oxygen ExchangeEfficient? Non-efficient?
Why?▪ Lots of collar cells working together
Structure of a SpongeMade of ?
Spicules – calcareous or siliceous, support structures
Spongin – fibrous proteins, made of collagen
Spicules
SponginFun fact:
When you wash with natural
sponges, this is the portion you wash/exfoliate
with!
Spicules & Spongin
Characteristics of SpongesReproduce asexually or
sexually By? Budding or gemmules (asexual),
sperm and egg (sexual)Larva: motile, moveAdults: sessile, don’t move
Budding
SexualSponge Love Scene
#2
Sponge Love Scene #1
Gemmule
Three Main Body Types
1. Asconoid Def: one large
body cavity Characteristics
:▪ Collar cells line
the main body cavity
▪ Contain many pores
Three Main Body Types
2. Syconoid Def: many
canals, water flows through each canal
Characteristics:▪ Collar cells line
canals▪ Can filter more
water
Three Main Body Types
3. Leuconoid Def: contains
chambers Characteristi
cs: collar cells line
chambers Often used for
shower sponges
Classification of Sponges
Kingdom: Animalia Phylum: Porifera Class CalcareaClass HexactinellidaClass Demospongiae
Class CalcareaSpicules
Made of calcium carbonate (like baking soda)
Shape: needle shaped, 3-4 sections/rays
Body types? All three types represented
Class HexactinellidaSpicules
Made of? Silica (glass-like) Description: Six sections/rays
Body types? Asconoid or leuconoid
Often called? Glass sponges
Class Hexactinellida
Class DemospongiaeSpicules
Made of: silica Description: don’t have 6 rays
Body types? Leuconoid onlyOther characteristics:
Make up 95% of all sponges Use this type in bath/shower
Class Demospongiae
Cnidarians
Characteristics of CnidariansKingdom Animalia
Phylum CnidariaExamples:
Hydra, sea anemone, jellyfish, Portuguese-man-o-war, moon jelly, sea pen, coral
Where do they live??? Aquatic (mostly marine/salt-water)
Characteristics of Cnidarians
Symmetry: Radial or biradial Head region? No definite head
region Two basic types:
1. Polyp: tentacles facing upwardsEx: sea anemone, coral
2. Medusa: tentacles facing downwardsEx: jellyfish, man-o-war
Polyp FormPolyp –
Lifestyle of polyps? Sessile (do not move)
Body shape? Tubular (tube-like) Mouth: Surrounded by tentacles
(facing up)
Medusa FormMedusa –
Lifestyle? Mobile/motile (move) Body shape? Umbrella shaped Mouth : surrounded by tentacles
that face downwards
Life CycleBody forms? Most cnidarians
exist as BOTH body forms at some point during their life cycle
POLYMORPHICReproduction
Polyp: reproduce asexually using budding
Medusa: reproduce sexually using sperm/egg
Life Cycle
Characteristics of CnidariansTwo layered body
Epidermis – ▪ Def: outer part of the body▪ Derived from? Ectoderm
Gastrodermis – ▪ Def: inner part of the body▪ Derived from? Endoderm▪ Lines the gut cavity▪ Main function: digestion
Characteristics of Cnidarians
Characteristics of Cnidarians
Tentacles contain cnidocytes Function: aid in capture of
prey/food Characteristics: armed with
nematocysts Nematocyst: stinging cell (contains
hook/barb used to catch)
NematocystStinging cellsContain filamentWhen do they uncoil? When they are touched by animals (in the environment)
Contain barb or spinePoisons can be injected
Nematocysts
Nematocyst
Firing
Nematocyst Firing
Four Classes of Cnidarians
Class Hydrozoa
Class Scyphozoa
Class Cubozoa
Class Anthozoa
Class HydrozoaSolitary (live as an individual)Colonial (live in groups)Reproduce? Asexually (Polyp
form) OR sexually (medusa form)Where do they live?
Freshwater OR marine/salt-waterExamples: Hydra, Tubularia
Obilia
Polyp Medusa
Class ScyphozoaMovement: Solitary (live by
themselves, but MOVE quiet a bit)Body form: Medusa form (most)Where do they live? All
marine/salt-waterOrgans? Sensory organs found on
the ridge of the umbrellaExamples: Cassiopeia, Aurelia
Cassiopeia
Class CubozoaMovement: Solitary (live by
themselves but MOVE quite a bit)Body form: Medusa form (most)Where do they live? All
marine/salt-waterCharacteristics? Umbrella is more
square in shapeExamples: Tripedalia, Carybdea
Carybdea
Class AnthozoaMovement: Solitary (individual)or
colonial (group); tentacles move some (but animals are fixed to a spot, usually)
Body form: all polyps (no medusas!)
Where do they live? All marine/salt-water
Examples: Exist in three subclasses
▪ Subclass Hexacorallia▪ Subclass Ceriantipatharia▪ Subclass Octocoral
Hexacorallia
Ceriantipatharia
Octocorallia
Sponges and Cnidarians in BiosphereHuman Uses
Bioindicators: provide info about the environment/oceans/water bodies▪ Sponges
▪ Filter water ▪ Pollutants are concentrated in collar cells
▪ Corals: ▪ sensitive to water pollution (loose coloration)
Help protect shore line from erosion (decrease force of waves)
Sponges and Cnidarians in Biosphere Biomedical/Pharmaceutical industry1. New antibiotics2. Anticancer compound found
in small % of sponges
Consumer products1. Natural sponges (bathing)2. Spicules used in clay to
strengthen ceramic pots, etc
Sponges and Cnidarians in BiosphereIn the Environment
Form of food, camouflage and protection for other animals
Many symbiotic relationships Corals and Sponges
▪ The most abundant animal in most reefs▪ Base of most aquatic food chains▪ May be used as camouflage
▪ Ex: Crab species place sponges on their backs for protection
Sponges and Cnidarians in BiosphereOther relationships
Cnidarians with dinoflagellates(protists)—▪ Form reefs when this relationship occurs
Homes for other organisms ▪ Shrimp, clown fish and eels use sponges as
homes▪ Coral reefs provide protection