Abstract
The small numerous papillae on the ventral surface of the gravid proglottid of adultSpirometra erinacei were studied by scanning electron microscopy. The arrangement of clumps of papillae was recognized on the surface of the central portion around the genital atrium, with lateral clumps being located above a pair of longitudinal nerve cords and marginal ones, on both sides of the proglottid. By transmission electron microscopy, two types of nonciliated sensory receptors were observed within the papillae. The type I, single receptor was embedded within a papilla. This dome-like sensory receptor contained two electron-dense collars and four rootlets surrounded by numerous thin filaments. The type II receptor was found arranged in groups in the area between the papillae, and the apical end was exposed to the external environment. This simple, club-like sensory receptor contained electron-lucent vesicles and microtubules. We believe that the papillae play an important role in crossinsemination.
Similar content being viewed by others
References
Andersen K (1975a) Comparison of surface topography of three species ofDiphyllobothrium (Cestoda, Pseudophyllidea) by scanning electron microscopy. Int J Parasitol 5: 293–300
Andersen K (1975b) Ultrastructural studies onDiphyllobothrium ditremum andD. dendriticum (Cestoda, Pseudophyllidea), with emphasis on the scolex tegument and the tegument in the area around the genital atrium. Z Parasitenkd 46: 253–264
Berntzen AK, Mueller JF (1972) In vitro cultivation ofSpirometra spp. (Cestoda) from the plerocercoid to the gravid adult. J Parasitol 58: 750–752
Blair DG, Burt MDB (1976) Observations on the ultrastructure of papillae and associated sensilla on the scolex ofMonoecocestus americanus (Stiles 1895) (Cestoda: Anoplocephalidae). Can J Zool 54: 802–806
Blitz NM, Smyth JD (1973) Tegumental ultrastructure ofRaillietina cesticillus during the larval-adult transformation, with emphasis on the rostellum. Int J Parasitol 3: 561–570
Fairweather I, Threadgold LT (1983)Hymenolepis nana: the fine structure of the adult nervous system. Parasitology 86: 89–103
Featherston DW (1972)Taenia hydatigena. IV. Ultrastructure study of the tegument. Z Parasitenkd 38: 214–232
Hess E, Guggenheim R (1977) A study of the microtriches and sensory processes of the tetrathyridium ofMesocestoides corti Hoeppli, 1925, by transmission and scanning electron microscopy. Z Parasitenkd 53: 189–199
Morseth DJ (1967) Observations on the fine structure of the nervous system ofEchinococcus granulosus. J Parasitol 53: 492–500
Nollen PM (1975) Studies on the reproductive system ofHymenolepis diminuta using autoradiography and transplantation. J Parasitol 61: 100–104
Nollen PM (1983) Patterns of sexual reproduction among parasitic platyhelminths. Parasitology 86: 99–120
Smyth JD, McManus DP (1989) The physiology and biochemistry of cestodes. Cambridge University Press, Cambridge
Torii M (1983) The fine structure of the sensory cells of the plerocercoid ofSpirometra erinacei. Jpn J Parasitol 32: 109–124
Webb RA, Davey KG (1974) Ciliated sensory receptors of the unactivated metacestode ofHymenolepis microstoma. Tissue Cell 6: 587–598
Yamane Y, Maejima J, Kamo H (1974) Study ofSpirometra erinacei (Rudolphi 1819) Faust, Campbell and Kellogg, 1929 through scanning electron microscope. Yonago Acta med 18: 84–93
Yamane Y, Bylund G, Abe K, Osaki Y, Okamoto T (1989) Scanning electron microscopic study of fourDiphyllobothrium species. Parasitol Res 75: 238–244
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Okino, T., Hatsushika, R. Ultrastructure studies on the papillae and the nonciliated sensory receptors of adultSpirometra erinacei (Cestoda, Pseudophyllidea). Parasitol Res 80, 454–458 (1994). https://doi.org/10.1007/BF00932690
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00932690