How to include class which uses base class - c++

Question

The question is hard to ask but I'll try to explain:
I have a class World that import Class Species, and holds list of Species.
I need to have pointer to class World in class Species, but if I import Class World before declaring Species errors occurs.
Example in pseudo code:
import B
Class A
{
list of B
}
Class B
{
Class A* a
}
so I need to import class A to make pointer to it, but when I do Class B is not declared in clas A.
my code:
#pragma once
#include <iostream>
class Species
{
protected:
std::string speciesName;
int strengh;
int effort;
int posX;
int posY;
int specieSymbol;
public:
Species();
Species(std::string speciesName, int strengh, int effort, int posX, int posY);
int getPosX();
int getPosY();
void setPosX(int x);
void setPosY(int y);
int getSpeciesSymbol();
std::string getSpeciesName();
virtual void action() = 0;
virtual void colision() = 0;
//void setWorld(World* w);
//World* getWorld();
~Species();
};
#pragma once
#include <iostream>
#include "Species.h"
#include <list>
#include "Board.h"
class World
{
private:
std::list <Species*> species;
Board* board;
public:
World(Board *board);
void addSpecies(Species* s);
void printSpecies();
void printWorld();
void Update();
~World();
};