THE CEMENT APPARATUS OF LARVAL AND ADULT POMPHORHYNCHUS-LAEVIS (ACANTHOCEPHALA, PALAEACANTHOCEPHALA)

Light and electron microscopy were used to study the ultrastructure of the cement apparatus, namely cement glands and cement ducts of mature specimens of the acanthocephalan parasite Pomphorhynchus laevis Mulle r, 1776, recovered from the digestive tracts of fish Leuciscus cephalu s Risso, 1826. In addition, the cement glands of immature P. laevis fo und within the body cavity of the fish Alburnus alburnus alborella De Filippi, 1844 were examined. In a mature male of P. laevis the 6 cemen t glands are rounded to oval in shape and each of them has an outer cy toplasmic layer containing nuclei and surrounding a space for storage of the cement material within the gland. The nuclei have an irregular outline and the cytoplasm of the cells contains round, membrane-bound secretory granules approximately 1 mu m in diameter. Nuclei surrounded by secretory granules were present inside the gland lumen. Within the gland ducts of mature males, granules were present within the wall th ickness and, inside the luminal area, mitochondria were encountered. I n contrast, within the cement glands of immature P. laevis there were no secretory granules and the chromatin of the nuclei appeared condens ed. The nature of the secretory product of the cement glands was inves tigated with histological and electrophoretic methods. A protein with molecular weight of 23 kDa was recorded as a major component of cement .