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Ultrastructure of male Centrorhynchus globocaudatus (Acanthocephala) cement apparatus and function of cement gland secretion

Published online by Cambridge University Press:  09 June 2020

B. Sayyaf Dezfuli Open the ORCID record for B. Sayyaf Dezfuli [Opens in a new window] ,
S. Rubini ,
J.A. DePasquale  and
F. Pironi
B. Sayyaf Dezfuli*
Affiliation:
Department of Life Sciences & Biotechnology, University of Ferrara, St Borsari 46, 44121Ferrara, Italy
S. Rubini
Affiliation:
Experimental Zooprophylactic Institute of Ferrara, St Modena 483, 44124Cassana Ferrara, Italy
J.A. DePasquale
Affiliation:
Morphogenyx Inc, PO Box 717, East Northport, NY11731, USA
F. Pironi
Affiliation:
Department of Life Sciences & Biotechnology, University of Ferrara, St Borsari 46, 44121Ferrara, Italy
*
Author for correspondence: B.S. Dezfuli, E-mail: dzb@unife.it
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Abstract

Cement glands are one of the most conspicuous and distinctive elements of taxonomic interest in male Acanthocephala. Cement glands vary in shape, number and arrangement in different classes of the taxon. The glands and their products have a fundamental role in the reproductive process. Light and electron microscopy were used to investigate the ultrastructure of the cement apparatus, which includes both cement glands and the cement reservoir, in mature males of Centrorhynchus globocaudatus (Zeder, 1800). Centrorhynchus globocaudatus is an enteric parasite of birds of prey, including Falco tinnunculus (Linnaeus, 1758) and Buteo buteo (Linnaeus, 1758) from the province of Ferrara (northern Italy). The four elongated cement glands of C. globocaudatus are situated posterior to the testes. Sections through the cement glands show each gland is surrounded by a fibrous envelope with an approximate thickness of 0.6 μm. Beneath this envelope is an outer cytoplasmic layer thickness ranging from 22 to 26 μm, which contains a number of nuclei with diameters variable from 20 to 22 μm. The cytoplasmic layer is filled with prominent free ribosomes and many mitochondria with lamellar cristae. Secretory granules, measuring from 1 to 1.3 μm in diameter, are formed within the cytoplasmic layer. The cytoplasmic layer surrounds the luminal area for storage of the cement material in each gland. Cement gland ducts arise from the gland and extend towards a common cement reservoir in close contact with the seminal vesicle and Saefftigen's pouch. Microtubules, large secretory granules and rest of undefined organelles were also observed within the cement reservoir.

Keywords

Acanthocephalancement apparatusultrastructurereproduction
Type
Research Paper
Information
Journal of Helminthology , Volume 94 , 2020 , e161
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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