Double chromatin dot forms
From haematologyetc.co.uk
Description
Early or late trophozoites where the chromatin dot has two separate masses - a double dot that is sometimes said to resemble a signet ring, although this really only applies for typical ring forms where dots are relatively close together.
Species significance
Most often this appearance is considered to be a feature of P.falciparum and can be helpful to indicate this species; however the form is not specific and may occur in any species.
Additional images:
double chromatin dot forms in a late trophozoite of peovale a or early trophozoites of pevivax b peknowlesi