Eric Walker added Sharks to Euselachii, and added Euselachii to Elasmobranchii

Eric Walker added Euselachii to Elasmobranchii, and added Elasmobranchii to Chondrichthyes

Eric Walker added Elasmobranchii and Rhinopristiformes to Chondrichthyes, and added Chondrichthyes to Chordata