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2004 | 49 | 3 |
Tytuł artykułu

Functional ultrastructure of the oncospheral envelopes of twelve hymenolepidid species with aquatic life cycle s

Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Most of the previous studies on the functional ultrastructure of oncospheral envelopes in cestodes are restricted to hymenolepidids with terrestrial life cycles, mainly parasites of mammals. The purpose of the present study is to describe and compare origin, differentiation and functional ultrastructure of oncospheral envelopes of 12 cestode species with aquatic life cycles examined by means of transmission (TEM) and scanning electron microscopy (SEM) techniques. Results of our comparative electron microscopical studies revealed that despite the general similarities in the ultrastructure of the primary envelopes surrounding developing embryos, there exist important differences both in the type of morphogenesis and in the final form and arrangement of the secondary envelopes between the 12 examined hymenolepidids. In all examined species, the embryophore develops within the syncytial layer of the primary inner envelope and is transformed into a heterogeneous structure in the final phase of infective egg formation. Some ultrastructural features of oncospheral envelopes are very characteristic for the cestode species examined, and may indeed represent a new useful criterion for differential diagnosis. Our data on ultramorphology of the envelopes and their connections with the uterine wall may also be useful for better understanding of the developmental physiology and biology of the oncospheral stage of hymenolepidids with aquatic life cycles. The comparative analysis allows determination of some ultrastructural features that adapt oncospheres to the behavior and habitat of their intermediate hosts. Interrelations among the ultrastructure of the oncospheral envelopes, habitat of crustacean intermediate hosts, and cestode life cycles are drawn and discussed.
Wydawca
-
Czasopismo
Rocznik
Tom
49
Numer
3
Opis fizyczny
p.177-181,fig.,ref.
Twórcy
autor
  • Department of Medical Biology, Medical University of Warsaw, 73 Nowogrodzka Street, 02-018 Warsaw, Poland
autor
  • W. Stefański Institute of Parasitology, Polish Academy of Sciences, 51/55 Twarda Street, 00-818 Warsaw, Poland
Bibliografia
  • Chomicz L. 1993. Ultrastructural studies on the oncospheral envelopes of six species of genus Diorchis (Cyclophyllidea, Hymenolepididae). Acta Parasitologica, 38, 161-165.
  • Chomicz L. 1996a. The ultrastructure of the oncospheral envelopes of Fimbriaria czaplinskii Grytner-Zięcina, 1994 (Cestoda, Hymenolepididae). Acta Parasitologica, 41,186-190.
  • Chomicz L. 1996b. Comparative ultrastructural studies on uterus - egg interrelations in some species of hymenolepidids (Cestoda) with aquatic life cycles. Acta Parasitologica, 41, 191— 198.
  • Chomicz L., Czubaj A. 1991. Transmission electron micrograph studies of developing oncospheral envelopes of Fimbriaria fasciolaris (Hymenolepididae). Parasitology Research, 77, 503- 508.
  • Chomicz L., Czubaj A. 1992. Comparative studies on the differentiation of inner oncospheral envelope in some species of Hymenolepididae (Cestoda). Electron Microscopy. Proceedings of the 10th EUREM, 7-11 September, 1992, Granada, Spain, 3, 329-330.
  • Chomicz L., Swiderski Z. 1992. Dicranotaenia coronula: cellular organization of infective oncospheres. Electron Microscopy II, 12, 332-333.
  • Chomicz L., Swiderski Z. 1994. Studies on the infective eggs of the cestode Fimbriaria fasciolaris Pallas 1781 (Cyclophyllidea, Hymenolepididae). Proceedings ICEM, 13, 1429-1430.
  • Chomicz L., Walski M. 1991. Ultrastructure of oncospheral envelopes of Diorchis elisae (Skrjabin, 1914) Spassky et Frese, 1961 (Cestoda, Hymenolepididae). Parasitology Research, 77, 550-552.
  • Chomicz L., Świderski Z., Czubaj A. 1995a. Ultrastructure of oncospheral envelopes in hymenolepidids (Cestoda) with aquatic life cycles. Hydrobiologia, 305, 213-216.
  • Chomicz L., Grytner-Zięcina B., Walski M. 1995b. Morphological studies on envelopes of oncospheres of the hymenolepidid cestode, Fimbriaria fasciolaris (Pallas, 1781). Acta Parasitologica, 40, 26-30.
  • Chomicz L., Świderski Z., Grytner-Zięcina B. 1995c. Ultrastructure of oncospheral envelopes and their differentiation in the cestode, Dicranotaenia coronula (Dujardin, 1845) (Cyclophyllidea, Hymenolepididae). Acta Parasitologica, 40, 31-36.
  • Chomicz L., Cielecka D., Walski M., Czubaj A. 1997. Ultrastructural studies on the oncospheral envelopes of hymenolepidid cestode, Wardium aequabile (Rudolphi, 1810) Spassky et Spasskaja, 1954, in the final stage of infective egg formation. Acta Parasitologica, 42, 40-45.
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  • Conn D.B. 1988b. The role of cellular parenchyma and extracellular matrix in the histogenesis of the paruterine organ of Mesocestoides lineatus (Cestoda: Cyclophyllidea). Journal of Morphology, 197, 303-314.
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  • Conn D.B. 1999. Ultrastructure of the embryonic envelopes and associated maternal structures of Distoichometra bufonis (Cestoidea, Nematotaeniidae). Acta Parasitologica, 44,4-10.
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  • Tkach V.V., Świderski Z. 1997. Late stages of egg maturation in the cestode Pseudohymenolepis redonica Joyeux et Baer, 1935 (Cyclophyllidea, Hymenolepididae), a parasite of shrews. Acta Parasitologica, 42, 97-108.
  • Tkach V.V., Świderski Z. 1998. Differentiation and ultrastructure of the oncospheral envelopes in the hymenolepidid cestode Staphylocystoides stefanskii (Żarnowski, 1954). Acta Parasitologica, 43,222-231.
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Bibliografia
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