• (n.) The second segment of one of the Gregarinae.
Anterior half of a cephaline gregarine protozoan.
Pro`to·mer'ite noun [ Proto- + -mere + -ite .] (Zoology) The second segment of one of the Gregarinæ. 
Type: Term Pronunciation: prō-tom′ĕ-rīt, prō′tō-mēr′īt Definitions: 1. The second segment (lacking a nucleus) of a septate gregarine, between the epimerite and the deutomerite; it becomes the anterior end of the gamont after it has broken free of its host cell, leaving the epimerite embedded (usu...