Upload
amberly-fitzgerald
View
217
Download
1
Tags:
Embed Size (px)
Citation preview
Sponge: Body Structure
Invertebrate animalsNo body symmetryNever have tissues or organsLooks like a hollow bag
◦Large opening at one end and tiny pores covering the surface
Spikes support and protect sponges body
Sponge: Obtaining Food and Oxygen
Eats tiny single-celled organisms
Collar cells that line central cavity, trap the tiny organisms
Jelly-like cells inside sponge digest, or break down, the food
Sponges get oxygen from water
Sponges: Reproduction
Asexually◦Budding: small new structures grow from the
sides on an adult sponge◦Buds eventually break free and begin new life
Sexually◦Sponges produce both sperm cells and egg
cells (do not have separate sexes)◦Sperm cells released in water, enter another
sponge, fertilize its eggs, larva develops◦Larva: immature form of an animal that looks
very different from the adult
Cnidarians
Jellyfish, corals, and sea anemonesInvertebrates that have stinging cells
to capture food and protect themselvesTake food into central body cavity
Cnidarians: Body Structure
Two different body plans (vase and bowl)
Radial symmetryCentral hollow cavityTentacles containing stinging cells
Body Structure:Polyp
Vase-shaped body plan is a POLYPSea anemoneMouth opens at topTentacles spread out from around mouth
Most are attached to underwater surface
Body Structure:Medusa
Bowl-shaped body plan is a MEDUSA
JellyfishAdapted for a swimming lifeMouths open downward and
tentacles trail down
Obtaining Food
Use stinging cells to catch animals they eat (prey)
Contains threadlike structure with spines
Uses tentacles to pull prey to mouthTakes food into central body cavity Expels undigested food through mouth
Movement
Unlike adult sponges, many cnidarians move to escape danger and to obtain food
Jellyfish?
Sea Anemones?
Stony Coral
a coral reef is built by cnidarianscoral reefs are home to more species
of fishes and invertebrates than any other environment on Earth
Coral polyps produce hard, stony skeletons around their soft bodies
Portuguese Man-of-War
Contains as many as 1,000 individuals that function together as one unit
Top: gas filled chamber, allows colony to float
Bottom: polyps with different functions drift below◦Some catch prey and help with digestion and reproduction