Biology 1102

Lecture 5

Slide 2 - Coelomates

Slide 3 – Fertilizing an egg

Slide 4 – Formation of the blastomere

Slide 6 - Blastula

Slide 14 - Gastulation

Slide 7 - Gastrulation

Slide 16 - Neurulation

Slide 17 – radial and spiral cleavage

Slide 10 – Cleavage patterns

Slide 11 – Protostome and deuterostome body plan

Slide 18 – protosomes - schizocoelom

The blastopore is the single opening of the archenteron and in protosomes, the blastopore forms the mouth.

The development of the mesoderm in protosomes are called schizocoelom which is defined as the developing mesoderm rises from the area near the blastophore where division takes place forming the mesoderm

Slide 19 – deuterostomes - enterocoelom

In deuterosomes, the blastopore (single opening of the archenteron) forms the anus.

The development of the mesoderm is called an enterocoelom which is defined as the developing mesoderm rises from a pair of mesodermal pouch from the primitive gut (endoderm). This pouch enlarges until they meet and fuse

Slide 20 - Mollusca

Slide 21 – Molluscs – internal structure

Slide 22 – Molluscs - bivalves

Slide 23 – Molluscs - cephalopods

Slide 18 – Giant squid

Slide 17 – Molluscs - gastropods

Slide 20 – Segmented worms

Slide 18 – Phylum Annelida – Class Polychaeta

Slide 18 – Phylum Annelida – class Oligochaeta

Slide 20 - Phylum Annelida – Class Hirudinea