epimeriten.

1885 Encycl. Brit. XIX. 854/1 [article Gregarinidea] There is frequently if not always present, either in early growth or more persistently, an anterior proboscis-like appendage (the epimerite) growing from the protomerite.

1921 T. J. Parker & W. A. Haswell Text-bk. Zool. (ed. 3) I. ii. 85 Sometimes the protomerite is produced in front into a process ending in a rounded enlargement, the epimerite, which may be provided with radiating spine-like projections.

1961 D. L. Mackinnon & R. S. J. Hawes Introd. Study Protozoa iii. 169 The Cephalina, which are gut parasites in which the body is typically divided into different regions, of which the anterior develops an organ of fixation called the epimerite.