Animals - Invertebrates - gmhsjones / Science with Jones Porifera Reproduction both sexually (sperm...
Transcript of Animals - Invertebrates - gmhsjones / Science with Jones Porifera Reproduction both sexually (sperm...
Phylum Porifera
Example – Sponges & Hydra
Characteristics
Name means “pore” bearer
Simplest, least complex animals, “primitive”
Movement type Sessile
Method of feeding filter feeder organism filters
small particles of food from H2O as it passes through
organism
Phylum Porifera
Reproduction both sexually (sperm and eggs)
and asexually (budding)
Fertilization external, sperm carried by water
current
Excretion wastes expelled through opening of
sponge called osculum
Respiration pore cells allow H2O
through sponge carrying oxygen
into the cells of the sponge
Phylum Cnidarians
Examples: coral, jellyfish, sea anemone
Characteristics
Movement type some sessile, some move
Method of feeding nematocysts = capsule in
tentacle that contains poison – they sting their prey;
mouth for ingestion
Phylum Cnidarians
Reproduction sexual (medusa)
and asexual (polyps break off)
Fertilization external
Excretion undigested material released through
mouth (in/out same opening)
Respiration oxygen and carbon dioxide diffuse
through body cells
Phylum Mollusca
Examples – snails, clams, octopus/squid
Characteristics
3 types
Gastropod (snails): single shell, radula = tongue with teeth
that drills or scrapes food
Bivalve (clams & oysters): two shells, filter feeders
Cephalopod (octopus, squid): no shell, “head-footed”, eats
with mouth and beak
Phylum Mollusca
Method of feeding: some with radula,
some are filter feeders, some with mouth
Reproduction: sexual, land dwelling
snails are hermaphrodites
Fertilization: external
Phylum Mollusca
Excretion: nephridia – tubelike structure to expel
wastes
Respiration: gills if in H2O, primitive lung on land
Phylum Annelida
Examples – earthworms, leeches, bristle worms
Charcteristics
Method of feeding – gizzard & crop, grinds up organic
matter from soil and leaves
Reproduction – most are hermaphrodites but can also
mate
Fertilization – internal
Phylum Annelida
Excretion –nephridia – excretes waste through each
segment in skin and through anus
Respiration: exchange gases through skin (it must be
moist)
Movement – use setae – tiny bristles help worm move
by anchoring it in the soil as it contracts muscle
segments
Phylum Arthropoda
Examples: spiders (fearless), crabs, insects, lobsters/shrimp
Characteristics
Most diverse (variety) phylum
Body parts: head, thorax, abdomen
Movement: jointed appendages (arthro-) 6-8 to 100s
Skeleton: exoskeleton to protect and support internal organisms
Method of feeding: mandibles (jaws) for chewing and biting