Is costa rica a segment of the euro-indian mainland?

Answer 1

Yes. According to West and Augelli (1989), Mexico and all Central America (Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua and Panama) are included in the area defined as Euro-Indian Mainland. It's population have diverse cultural traits from both European and indigenous peoples. Some sections are more European, some are more indigenous, while others are mestizo, a mixture of both European and native cultures and traits.

Answer 2

No; it is in the American (or North American, or Central American depending on your point of view) region.