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Morphology and fine structure of oncospheral envelopes in gravid proglottids of Diploposthe laevis [Bloch, 1782] Jacobi, 1897 [Cestoda, Hymenolepididae]

100%

Chomicz L., Walski M., Grytner-Ziecina B., Rebandel H.

Acta Parasitologica

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1999

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tom 44

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nr 4

Another hymenolepidid species, Diploposthe laevis (Bloch, 1782) Jacobi, 1897, developing in hosts in an aquatic environment was used to examine oncospheral envelope differentiation and uterus-egg interrelations at the ultrastructural level (SEM and TEM). Inside of the distal proglottids of two D. laevis specimens, the only gravid specimens from among 20 cestodes found, the uterus took the form of wide tubes whose folded walls created chambers in which oncospheres were present within their envelopes. The lumenal surface of the uterus was covered with numerous projections that linked to individual oncospheres forming the uterus-egg interface. Marked differences in the sizes of different oncospheres were visible. Finally, five layers around each Diploposthe laevis oncosphere were revealed: (1) the outer envelope, (2) the distal cytoplasmic portion of the inner envelope, (3) the non-cytoplasmic embryophore, (4) the proximal portion of the inner envelope and (5) the non-cytoplasmic oncospheral membrane. Striking features visible up to the end of the uterine period of formation of D. laevis infective egg were: (1) presence of well-developed outermost envelope, highly folded, rich in cytoplasmic structures, probably complex in origin, and (2) relatively weak development of the embryophore that was one-layered, moderate electrondense, with the granular material never forming a very compact envelope.

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Tapeworms morphological changeability in the chain of Hymenolepis diminuta WMS strain generations

100%

Stradowski M.

Wiadomości Parazytologiczne

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1997

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tom 43

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nr 1

The investigations covered 54 subsequent generations of Hymenotepis diminuta WMS „strain" obtained through the administration of 6 cysticercoids of tapeworm to Wistar strain rats and WAG alb. rats. The number of tapeworms at 2.5 months after the infection of rats ranged from 3 to 6, on the average 5.2. Taking into consideration the most important type 1p2a (one testis on the poral side and two testes on the aporal side), 0p3a, 1p3a and 2p1a proglottids a significant differences was found in the distribution of the numerousity of type 1p3a proglottids (P<0.05). This indicates a possibility of an unguided change of the numerousity of proglottids of this type in a period covering 54 subsequent H. diminuta generations bred in laboratory conditions.

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The morphology and new records of two progynotaeniid cestode species

80%

Nikolov P. N., Georgiev B. B.

Acta Parasitologica

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2002

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tom 47

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nr 2

Progynotaenia odhneri Nybelin, 1914 and Paraprogynotaenia charadrii (Yamaguti, 1956) are redescribed and figured on the basis of specimens from Charadrius alexandrinus in Bulgaria (new geographical records). P. odhneri of Ryzhikov and Tolkacheva (1981) is considered to represent a heterogeneous group of species. The allocation of P. charadrii to the genus Paraprogynotaenia rather than Proterogynotaenia, as proposed by Jensen etal. (1983), is confirmed. The regularity of the alternation of the genital pores is rejected as a character for distinguishing Progynotaenia and Paraprogynotaenia; for this purpose, (he most reliable character is the position of the seminal receptacle relative to the ovary in female proglottides.

Ograniczanie wyników

2 Acta Parasitologica

1 Wiadomości Parazytologiczne

1 Chomicz L.

1 Georgiev B. B.

1 Grytner-Ziecina B.

1 Nikolov P. N.

1 Rebandel H.

1 Stradowski M.

1 Walski M.

1 2002

1 1999

1 1997

Morphology and fine structure of oncospheral envelopes in gravid proglottids of Diploposthe laevis [Bloch, 1782] Jacobi, 1897 [Cestoda, Hymenolepididae]

Tapeworms morphological changeability in the chain of Hymenolepis diminuta WMS strain generations

The morphology and new records of two progynotaeniid cestode species