Transcript Phylum Porifera

Kingdom Animalia
Invertebrates
Phylum Porifera
Phylum Cnideria
SPONGES
Sponges
Phylum Porifera (pore-bearers)/ simplest animal
Body Symmetry/Shape: Asymmetrical
Segmentation: None
Coelom/body cavity: Acoelomates
Nervous system: No Cephalization
Skeleton/Movement: Sessile, EndoskeletonSpicules
SPONGES
Digestion: filter feeders / many pores
.Choanocytes are flagellated cells that pull food in
thru ostia (pores) and the amoebocyte cells
circulate food around the organism
Excretion: diffusion; wastes exit thru osculum
Circulation: None
Respiration: diffusion-obtain oxygen from water
Reproduction: sexual-Hermaphrodites(have
sperm & egg)-Both sexes in same organism called
monoecious: asexual- bud; Regenerate body parts
Sponge examples &Uses
Examples: natural & kitchen sponges
Uses: cleaning, bathing, & makeup application
Body structure:
A. Osculum: water exits-part of feeding
B. Pore cells (ostia): water enters-part
of feeding
C. Collar cells:(choanocytes)- line
interior, have flagella to filter out food
from water
D. Amoebocytes: carry nutrients from
collar cells to body of the sponge
E. Spicules- support/skeleton
F. Epithelial cells-”skin”support/protection
Figure 26–8 The Anatomy of
a Sponge
Section 26-2
Water flow
Osculum
Central cavity
Pores
Choanocyte(collar cells)
Spicule
Pore cell
Pore
Epidermal cell
Archaeocyte
Cnidarians
Aurelia
Portugueseman-of-war
Sea Aneome
Hydras
Phylum Cnidaria- “stinging cell”;
predators
Germ Layers: 2
Body Symmetry/shape: Radial,
2 body forms: Polyp & Medusa
Segmentation: none
Coelom: Acoelomate
Nervous: Cephalization absent;
Nerve Net-conducts impulses
Skeleton/Movement: Hydrostatic;
nematocyst: stinging cells found on tentacles;
Digestion: one body opening for food & wastes
Excretion:
Circulation: none
Respiration: oxygen diffuses into body from water
Reproduction: asexual-budding-Polyp form- ex. Hydra
sexual-Medusa form- ex. Jellyfish
regenerates body parts
Groups & Uses of Cnidarians
• 3 Groups of Cnidarians:
1. Hydrozoans: colonies which appear to be one organism
Ex: Portuguese-man-of-war
2. Scyphozoans: independent medusa forms
Ex: jellyfish, box jelly
3. Anthozoans: colonies of polyps
Ex: corals, sea anemone
Riches of the sea
Structure:The Polyp and Medusa Stages
Epidermis
Mesoglea
Gastroderm
Tentacles
Mesoglea
Gastrovascular cavity
Mouth/anus
Mouth/anus
Gastrovascular
cavity
Tentacles
Medusa
Polyp
basal disc: sticky structure at the
bottom of polyp ; sessile