Here, for the first time in an ascaridoid (Hysterothylacium auctum), we present structural features of the phasmids, paired sense organs, positioned in a bilateral manner close to the point of the tail; the features were obtained using scanning and transmission electron microscopy. We found that each phasmid consists of a single ciliated dendritic process situated in a phasmidial canal surrounded by 2 supporting cells, a socket and a sheath cell. The socket cell contains clusters of electron-dense fibrous material in its apical region and covers the phasmidial canal along its whole length. The sheath cell is characterized by a well-developed endoplasmic reticulum. The phasmidial canal is lined with a thin layer of cuticle that becomes incomplete at the base of the ciliated dendritic process. In this region, the dendritic process consists primarily of a high number of microtubule singlets and some peripheral microtubule doublets. The base of the dendritic process, containing numerous striated rootlets, gives off a large number of fingerlike offshoots, villi, invading the surrounding sheath cell. The systematic significance and functional implication of the phasmid in nematodes are also discussed.
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June 2004
FUNCTIONAL MORPHOLOGY|
June 01 2004
PHASMID ULTRASTRUCTURE OF AN ASCARIDOID NEMATODE HYSTEROTHYLACIUM AUCTUM
Hans-Peter Fagerholm;
Hans-Peter Fagerholm
Laboratory of Aquatic Pathobiology, Department of Biology, Åbo Akademi University, BioCity, Artillerigatan 6, FIN-20520 Åbo/Turku, Finland. hafagerh@abo.fi
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Magdaléna Bruňanská;
Magdaléna Bruňanská
Laboratory of Aquatic Pathobiology, Department of Biology, Åbo Akademi University, BioCity, Artillerigatan 6, FIN-20520 Åbo/Turku, Finland. hafagerh@abo.fi
* Parasitological Institute, Slovak Academy of Sciences, Hlinkova 3, 040 00 Košice, Slovak Republic. Present address: Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic
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Allan Roepstorff;
Allan Roepstorff
Laboratory of Aquatic Pathobiology, Department of Biology, Åbo Akademi University, BioCity, Artillerigatan 6, FIN-20520 Åbo/Turku, Finland. hafagerh@abo.fi
† The Danish Centre for Experimental Parasitology, Royal Veterinary and Agricultural University, Bulowsvej 13, DK-1870 Frederiksberg C, Copenhagen, Denmark
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Lis Eriksen
Lis Eriksen
Laboratory of Aquatic Pathobiology, Department of Biology, Åbo Akademi University, BioCity, Artillerigatan 6, FIN-20520 Åbo/Turku, Finland. hafagerh@abo.fi
‡ Department of Large Animal Science, Royal Veterinary and Agricultural University, Dyrlægevej 88, 1870 Frederiksberg, C. Copenhagen, Denmark
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J Parasitol (2004) 90 (3): 499–506.
Citation
Hans-Peter Fagerholm, Magdaléna Bruňanská, Allan Roepstorff, Lis Eriksen; PHASMID ULTRASTRUCTURE OF AN ASCARIDOID NEMATODE HYSTEROTHYLACIUM AUCTUM. J Parasitol 1 June 2004; 90 (3): 499–506. doi: https://doi.org/10.1645/GE-3168
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