Cook pasta according to the package instructions. Drain and set aside.
In a large sauté pan heat oil over medium heat. Add shallots and cook 3-5 minutes until fragrant and translucent. Add garlic and pepper flakes and cook another 1-2 minutes.
Season the shrimp with salt and pepper and add them to the pan. Cook until the shrimp have turned pink. Remove from the pan and set aside.
Next, add wine, broth and lemon juice to the pan and season with salt and pepper. Raise the mixture to boil then reduce to a simmer.
Add shrimp back to the pan and fold in the cooked pasta. Now also add the crab and gently mix in the pan. Cook for 2-3 minutes to warm up the crab. Add parsley, toss and serve immediately.