marsh fritillary
Marginal spots have rounded edges. These are sagittate on Spanish fritillary.
Forewing underside does not have black spots. They are present on Spanish fritillary.
Marginal spots have rounded edges. Black spots in sub-marginal area of hindwing.
Chequered pattern. Marginal spots (with rounded edges) can be white, yellow or orange. These are white and sagitate on Spanish fritillary.