, Volume 47, Issue 3, pp 170–178

Ultrastructure of the buccal capsule in the adult female Anguillicoloides crassus (Nematoda: Anguillicolidae)


    • Institute of ParasitologyBiology Centre of the Academy of Sciences of the Czech Republic
    • Parasitological InstituteSlovak Academy of Sciences
  • H. -P. Fagerholm
    • Department of Biology, Laboratory of Aquatic PathobiologyÅbo Akademi University
  • F. Moravec
    • Institute of ParasitologyBiology Centre of the Academy of Sciences of the Czech Republic
  • Z. Vasilková
    • Parasitological InstituteSlovak Academy of Sciences

DOI: 10.2478/s11687-010-0026-7

Cite this article as:
Bruňanská, M., Fagerholm, H.-., Moravec, F. et al. Helminthologia (2010) 47: 170. doi:10.2478/s11687-010-0026-7


The fine structure of the buccal capsule of the adult female nematode Anguillicoloides crassus (Spirurina) was studied for the first time. Results are based on serial section (longitudinal and transverse) light and transmission electron microscopy. The buccal capsule of A. crassus is a cuticular-lined structure. It can be divided into three main parts: cheilostom, gymnostom and stegostom. The cheilostom is the anterior region of the buccal capsule with the cuticular lining continuous with the body wall cuticle and underlain by epidermal syncytia. The gymnostom is a cuticular region with portions of it very electron dense and underlain by arcade syncytia. A dense circumoral cylinder together with the circumpharyngeal ring represent the prominent characters of the gymnostom. The stegostom is formed by anterior pharyngeal cuticle underlain by muscular radial cells and epithelial marginal cells. The cephalic cuticle of A. crassus makes a direct contact with the pharyngeal cuticle at the base of the circumoral cylinder, within a circumpharyngeal ring containing projections of pharyngeal muscular and marginal cells. The circumoral cylinder, circumpharyngeal ring and pharynx are connected to the body epidermis by junctional complexes. The buccal capsule includes occasionally 3 projections of the pharynx evidently observed in serial cross sections. These ultrastructural characters may provide useful data for comparative, functional as well as evolutionary studies within the Chromadorea.


UltrastructureAnguillicoloides crassusBuccal capsule

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© © Versita Warsaw and Springer-Verlag Wien 2010