[Rostellar organ or Taenia crassiceps (Cestoda: Taeniidae) larvae]

There are glandular elements of syntitial structure in parenchyma of scolex base of T. crassiceps larvae. They are located behind the suckers at the invaginated state of scolex. Perikaryons of gland contain dense rodshaped, spheric granules and great accumulations of electron-dense substance in vacuoles. The same types of secretary product are found in the rostellar tegument. The glandular elements are mostly developed in the period of the formation of rostellar hooks, but they are well expressed too in mature larvae thus providing morphofunctional specialization of rostellar tegument.