Spineless Wonders: A Survey of the Invertebrates Phylum:

Spineless Wonders: A Survey of the Invertebrates Phylum:

Spineless Wonders: A Survey of the Invertebrates Phylum: Protista Amoebas, Foraminifera, Radiolaria, etc. Phylum Porifera (Sponges) Single layer of tissue

(collared cells) Phylum Cnidaria / Coelenterata 2 layers of tissue: ectoderm, endoderm Phylum Cnidaria / Coelenterata

Hydra hard corals soft corals jellyfish sea pens

sea anemones 2 tissue layers: ectoderm, endoderm Worms - 3 tissue layers ectoderm, mesoderm, endoderm Phylum Brachiopoda (arm foot)

Key Features: pedicle, gut, muscles, lophophore Phylum: Bryozoa (moss animals) Key Features: Colonial Habit Have Lophophore

Phylum Echinodermata (spiny skin) Sea urchins Brittlestars Crinoids Starfish

Sea cucumbers Key Features: 5-fold symmetry, calcite plates Phylum Mollusca HAM (hypothetical ancestral mollusc)

Key Features: gut mantle cavity radula (rasper) gills foot Phylum: Arthropoda

trilobites eurypterids Insects Spiders Crabs Lobsters Barnacles

Etc. Key Features: Jointed appendages 3-fold division of body (head, thorax, abdomen) scorpions shrimps

Phylum Mollusca Gastropods Bivalves Cephalopods (squids, octopuses, cuttlefish, ammonoids)

Phylum: Hemichordata Key Characteristics: 3-part division of body (preoral lobe, collar, trunk) Pharynx Gill slits Stomochord

Pterobranchs Graptolites Acorn worms Phylum: Chordata Sea squirts and salps (Urochordates)

Amphioxus (lancelet) (Cephalochordates) Key Features: notochord dorsal nerve cord, pharynx gills slits

post-anal tail END OF LECTURE

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