Porifera The sponges
Sponges No true tissue Asymmetrical (some are radial) Four specialized cell types Choanocytes- feeding, water movement Pinacocytes- covering cells Porocytes- control water flow Amoebocytes- transfer food, gametes, immunity, make mesohyle, spicules, gemmules
Traditional Phylogeny
Sponge types
Sponge Anatomy
Scypha sp.
Scypha
10 9 2 1 12 3 5 7 8 6 4
Gemmules
Sponge Ciliated larvae
Cnidarians Hydrozoa – Hydras Scyphozoa – Sea Jellies , “ Jelly fish” Anthozoa- Sea Anemones
Cnidarians Diploboastic – Gastrodermis - Epidermis Radial Symmetry Cnidocytes- Nematocysts Polyp – Medusa
Polyp Medusa Oral Aboral Oral Aboral
Cnidocytes
Symmetry
Hydra nutrition
Cnidarian circulation
Simple Nervous net
Hydra sp.
Cross section
Nematocysts
Female Male
Obelia
Hydranth Gonangium Medusa Buds Ceonosarc Gonotheca
Perisarc Hypostome Hydrotheca Ceonosarc
Obelia sp. life cycle
Obelia sp. medusae