pseudostome
/ˈs(j)uːdə(ʊ)ˌstəʊm/Zoology
noun
Originally: the mouth or oral opening in an echinopluteus larva of a sea urchin. Now usually: the principal opening in the shell (test) of a testate amoeba, through which the pseudopodia extend.
Origin
Mid 19th century; earliest use found in William Thomson (1819–1890), archbishop of York. From pseudo- + -stome.