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Mormidea ypsilon is a species of stink bug in the family Pentatomidae found in Mexico, Central and South American countries as well as the Lesser Antilles.

Taxonomy: This species was first described by Carl Linnaeus in 1758 and named Cimex ypsilon.

 
The length of this beetle is between 7 and 9 mm. It is coloured brown with yellow hints and has a prominent pale cream to yellow Y shaped mark on the scutellum. The shoulders of the pronotum may be narrowly rounded or alternatively have spines.

Distribution: This species is present in Argentina, Brazil, Colombia, Guatemala, British Guiana, Honduras, Mexico, Nicaragua, Panama, Suriname, Uruguay and the Lesser Antilles.