...Reptilia - Saurapsida - Diapsida - Neodiapsida - Ichthyosauria, Placodontia, Nothosauria, Plesiosauria

Sea Monsters: A Prehistoric Adventure
Expedition Week: Death of a Sea Monster

Sea Monsters: Prehistoric Creatures of the Deep by Mike Everhart

Vocabulary Added:
diapsida: double-arch
neodiapsida: new-double-arch
ichthyosaur: fish-lizard
placodont: tablet-tooth
nothosaur: false-lizard
elasmosaur: thin-plate-lizard
plesiosaur: near-lizard

Activity:
Draw and label favorite extinct reptiles (ichthyosaur, elasmosaur, dimetrodon)
Add Ichthyosauria, Placodontia, Nothosauria, Plesiosauria to Animal Kingdom Tree