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Morpho-functional specialization of the branching sporocyst of Prosorhynchoides borealis Bartoli, Gibson & Bray, 2006 (Digenea, Bucephalidae)

  • I.M. Podvyaznaya (a1) and K.V. Galaktionov (a2)
Abstract

Sporocysts of Prosorhynchoides borealis were obtained from the marine bivalves Abra prismatica and studied using transmission electron microscopy. The sporocyst body consists of a mass of branching and intertwining hollow tubules that ramify through the host's digestive gland and gonads. This study investigated the ultrastructure of the sporocyst branches which comprise alternate distended areas (brood chambers) with a relatively thin body wall, narrower portions with a thicker body wall (constricted areas) and terminal regions. Pronounced differences between these areas were revealed in the structure of their tegument and body cavity lining, as well as in the cellular composition of the subtegumental layers. Body wall composition in distended areas was consistent with the specialization for cercarial nurture in the brood chambers. The structure of the constrictions suggested a dual role of nutrient absorption and physical separation of adjacent brood chambers. Two types of terminal region were identified, one specialized for the investigation and penetration of host tissues and the other, in which the germinal cells are formed, for cercarial production. The overall structure of the sporocyst branches helps explain why this linear modular system, i.e. brood chambers and constrictions continuously growing into the host tissue, enables the sporocyst's long-term existence and can continuously produce cercariae in numbers comparable with those produced by rediae and/or daughter sporocyst infrapopulations in other digeneans. The origin of the nuclei in the outer tegumental layer of some branching bucephalid sporocysts is also discussed.

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*E-mail: podvyaznaya_vermes@zin.ru
References
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Al-Salman, H.A. & James, B.L. (1989) Ultrastructural studies on the daughter sporocysts of Meiogymnophallus minutus (Digenea: Gymnophallidae). International Journal for Parasitology 19, 499508.
Bartoli, P., Gibson, D.I. & Bray, R.A. (2006) Prosorhynchoides gracilescens (Rudolphi 1819) (Digenea: Bucephalidae) from Lophius piscatorius L. is a species complex: a redescription of this species (sensu stricto) from the western Mediterranean and the description of P. borealis n. sp. from the northern North-East Atlantic. Systematic Parasitology 63, 203221.
Bennett, C.E. (1975) Surface features, sensory structures and movement of the newly excysted juvenile Fasciola hepatica L. Journal of Parasitology 61, 886891.
Ciordia, H. (1956) Cytological studies on the germ cell cycle of the trematode family Bucephalidae. Transactions of the American Microscopical Society 75, 103116.
Czubaj, A. & Niewiadomska, K. (1991) Sensory endings in the daughter sporocyst of Diplostomum pseudospathaceum Niewiadomska, 1984 (Digenea, Diplostomidae). Acta Parasitologica 36, 115120.
Czubaj, A. & Niewiadomska, K. (1996) Ultrastructure of sensory endings in Diplostomum pseudospathaceum Niewiadomska, 1984 cercariae (Digenea, Diplostomidae). International Journal for Parasitology 26, 12171225.
Dobrovolskij, A.A., Galaktionov, K.V., Muhamedov, G.K., Sinha, B.K. & Tihomirov, I.A. (1983) Parthenogenetic generations of trematodes. Trudy Leningradskogo Obshestva Estestvoispytatelei 82, 1108(in Russian).
Eydal, M., Bambir, S.H., Helgason, S. & Ólafsdóttir, D. (1998) Prosorhynchoides gracilescens (Digenea) in fish from Icelandic waters. Parasitology International 47 (Suppl.), 302.
Eydal, M., Helgason, S., Kristmundsson, Á. & Bambir, S.H. (1999) Metacercariae (Digenea) in Atlantic cod, haddock, whiting and saithe around Iceland. Bulletin of the Scandinavian Society for Parasitology 9, 3132.
Eydal, M., Helgason, S., Kristmundsson, Á., Bambir, S.H. & Jónsson, P.M. (2000) Abra prismatica (Mollusca) a new host record for Prosorhynchoides gracilescens (Digenea). Acta Parasitologica 45, 262.
Fournier, A. & Théron, A. (1985) Sectorisation morpho-anatomique et fonctionnelle du sporocyste-fils de Schistosoma mansoni. Parasitology Research 71, 325336.
Galaktionov, K.V. (1993) Life cycles of trematodes as components of ecosystems. 190 pp. Apatity, Russia, Cola Scientific Center of the Russian Academy of Sciences Publication (in Russian).
Galaktionov, K.V. & Dobrovolskij, A.A. (2003) The biology and evolution of trematodes. 592 pp. Dordrecht, Kluwer.
Gibson, D.I. (1974) Aspects of the ultrastructure of the daughter sporocyst and cercaria of Podocotyle staffordi Miller, 1941 (Digenea: Opecoelidae). Norwegian Journal of Zoology 22, 237252.
Gibson, D.I. (1987) Questions in digenean systematics and evolution. Parasitology 95, 429460.
James, B.L. & Bowers, E.A. (1967) Reproduction in the daughter sporocyst of Cercaria bucephalopsis haimeana (Lacaze-Duthiers, 1854) (Bucephalidae) and Cercaria dichotoma Lebour, 1911 (non Müller) (Gymnophallidae). Parasitology 57, 607625.
James, B.L., Bowers, E.A. & Richards, J.G. (1966) The ultrastructure of the daughter sporocyst of Cercaria bucephalopsis haimeana Lacaze-Duthiers, 1854 from the edible cockle, Cardium edule L. Parasitology 56, 753762.
Klag, J., Niewiadomska, K. & Czubaj, A. (1997) Ultrastructural studies on the sporocyst wall of Diplostomum pseudospathaceum Niewiadomska, 1984 (Digenea, Diplostomidae). International Journal for Parasitology 27, 919929.
Kniskern, V.B. (1952) Studies on the trematode family Bucephalidae Poche, 1907. Part 2. The life history of Rhipidocotyle septpapillata Krull, 1934. Transactions of the American Microscopical Society 71, 317340.
Køie, M. (1971) On the histochemistry and ultrastructure of the daughter sporocyst of Cercaria buccini Lebour, 1911. Ophelia 9, 145163.
Køie, M. (1987) Ultrastructural study of the host–parasite relationship, including encapsulation, of Buccinum undatum (Gastropoda, Prosobranchia) infected with daughter sporocysts of Zoogonoides viviparus (Trematoda, Zoogonidae). Diseases of Aquatic Organisms 2, 117125.
Korneva, Zh.V. & Poddubnaya, L.G. (1999) Adaptive significance of the tegument moult in caryophyllid and pseudophyllid cestodes. Parazitologiya 33, 97103(in Russian).
Matthews, R.A. (1973) The life-cycle of Prosorhynchus crucibulum (Rudolphi,1819) Odhner, 1905, and a comparison of its cercaria with that of Prosorhynchus squamatus Odhner, 1905. Parasitology 66, 133164.
Overstreet, R.M. & Curran, S.S. (2002) Superfamily Bucephaloidea Poche, 1907. pp. 67110in Gibson, D.I., Jones, A. & Bray, R.A. (Eds) Keys to the Trematoda, Vol. 1. London, CAB International and The Natural History Museum.
Podvyaznaya, I. (2007) An ultrastructural study of reproduction in the sporocysts of Prosorhynchoides gracilescens (Digenea: Bucephalidae). Parasitology Research 101, 3542.
Podvyaznaya, I.M. & Galaktionov, K.V. (2004) An ultrastructural study of the cercarial excretory system in Bucephaloides gracilescens and Prosorhynchus squamatus. Journal of Helminthology 78, 147158.
Pojmanska, T. & Machaj, K. (1991) Differentiation of the ultrastructure of the body wall of the sporocyst of Leucochloridium paradoxum. International Journal for Parasitology 21, 651659.
Popiel, I. (1978) The ultrastructure of the daughter sporocyst of Cercaria littorinae saxatilis V Popiel, 1976 (Digenea: Microphallidae). Zeitschrift für Parasitenkunde 56, 167173.
Popiel, I. & James, B.L. (1978a) Variations in the ultrastructure of the daughter sporocyst of Microphallus pygmaeus (Levinsen, 1881) (Digenea: Microphallidae) in chemically defined media. Parasitology 76, 349358.
Popiel, I. & James, B.L. (1978b) The ultrastructure of the tegument of the daughter sporocyst of Microphallus similis (Jäg., 1900) (Digenea: Microphallidae). Parasitology 76, 359367.
Reader, T.A.J. (1975) Ultrastructural, histochemical and cytochemical observations on the body wall of the daughter sporocyst of Cercaria helvetica XII (Dubois 1927). Zeitschrift für Parasitenkunde 45, 243261.
Rohde, K. & Watson, N. (1990) Non-ciliate sensory receptors of larval Multicotyle purvisi (Trematoda, Aspidogastrea). Parasitology Research 76, 585590.
Russell-Pinto, F., Bowers, E. & James, B. (1996) Ultrastructure study of the intramolluscan stages of Meiogymnophallus minutus (Digenea: Gymnophallidae) in Scrobicularia plana (Bivalvia) from Portugal. Parasitology Research 82, 428434.
Tennent, D.H. (1906) A study of the life history of Bucephalus haimeanus: a parasite of the oyster. Quarterly Journal of Microscopical Science 49, 635690.
Tennent, D.H. (1909) Account of experiments for determining the complete life-cycle of Gasterostomum gracilescens. Science 29, 432433.
Žd'árská, Z. (1992) Transmission electron microscopy of sensory receptors of Echinostoma revolutum (Froelich 1802) cercaria (Digenea: Echinostomatidae). Parasitology Research 78, 598606.
Žd'árská, Z. & Nebesářová, J. (2003) Transmission electron microscopy of intra-tegumental sensory receptors in the forebody of Crepidostomum metoecus (Digenea: Allocreadiidae). Folia Parasitologica 50, 215219.
Žd'árská, Z. & Nebesářová, J. (2004) Transmission electron microscopy of presumed sensory receptors in the forebody papillae of Crepidostomum metoecus (Digenea: Allocreadiidae). Folia Parasitologica 51, 2732.
Žd'árská, Z. & Soboleva, T.N. (1985) Electron microscope observations of the sporocyst of Postharmostomum gallinum Witenberg, 1923 (Brachylaimidae). Folia Parasitologica 32, 227230.
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