-sto·mia
I.\ˈstōmēə\  noun combining form 
(-s) 
Etymology: New Latin, from stom- + -ia -y 
 : mouth exhibiting (such) a condition 
< stenostomia >
II.noun plural combining form 
Etymology: New Latin, from Greek stomion mouth — more at stomion 
 : creatures sharing (such) a condition of the mouth  — in names of higher taxa in zoology
< Deuterostomia >
I.
< stenostomia >
II.
< Deuterostomia >