Cut shell of lobster tail segments lengthwise on top and underside. Pry open tail segments; remove meat. Cut into bite-size pieces. Set aside.
Bring 6 cups water to a boil; add shrimp, and cook 3 to 5 minutes or just until shrimp turn pink. Drain and rinse with cold water. Peel shrimp; devein, if desired. Set aside.
Melt butter in a large skillet over medium-high heat (do not brown). Add shallots; sauté until tender. Add wine, and cook over high heat 3 minutes. Stir in lemon juice; reduce heat, and simmer 1 minute. Remove from heat; stir in parsley and next 3 ingredients.
Add lobster and shrimp to shallot mixture; cook over low heat until seafood is hot, stirring often.
Cook pasta according to package directions; drain. Add hot cooked pasta to seafood mixture; toss well. Serve with lemon slices. Garnish, if desired.