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1

Morphological studies on envelopes of oncospheres of the hymenolepidid cestode, Fimbriaria fasciolaris [Pallas, 1781]

100%
Chomicz L., Grytner-Ziecina B., Walski M.
Acta Parasitologica
|
1995
|
tom 40
|
nr 1
The envelopes of oncospheres of Fimbriaria fasciolaris, found in the distal part of the strobila or free, were the subject of scanning electron microscope (SEM) and light microscope (LM) studies. The oncospheres inside the strobila were in close apposition to the uterine wall and showed morphological ties suggesting metabolic interactions. SEM studies allowed us to discern 3 stages of uterine development: early - with a continuous, tubular, and branched uterus; intermediate - with bulging parts of the uterus forming uterine capsules packed with oncospheres; late - with the uterus discontinuous, breaking down into uterine capsules, either individual or connected into chains of different lengths, containing 1 to 12 oncospheres. The uterine epithelium within uterine capsules was structurally heterogeneous, closely connected with the oncospheres, constituting a common uterine envelope. Infective eggs outside the strobila were deprived of the uterine envelope, and were joined together by separate external envelopes, easily visible in the LM. Live oncospheres observed over a 24 h period after liberation from the strobila exhibited alterations in taxonomically important features, such as dimensions and shape of the external envelope. The possible roles of different envelopes are discussed.
2

Transmission electron microscopy studies on the tegument of two species of genus Fimbriaria Froelich, 1802

67%
Grytner-Ziecina B., Cielecka D., Chomicz L.
Acta Parasitologica
|
1995
|
tom 40
|
nr 2
Comparative studies on the tegument of F. fasciolaris (Pallas, 1781) and F. czaplinskii Grytner-Zięcina, 1994, using transmission electron microscopy revealed in both species examined evident differences in the morphology of the tegument surface from various parts of the cestode body (scolex, pseudoscolex, strobila). Two categories of microtriches, characteristic for both studied fimbriariids, were found: (1) typical microtriches with a well developed basal part and an osmiophilic spine at the apex, present on the scolex and on the fan-like, polar side of the pseudoscolex, and (2) non-typical spineless microtriches, present on the small, aporal part of the pseudoscolex and on the whole surface of the strobila. The presence of numerous spiny microtriches on the pseudoscolex perhaps indicates an important role for the peculiar holdfast organ, in supporting the scolex in securing the attachment of fimbriariid cestodes in the host intestine. Details of the tegument ultrastructure of Fimbriaria species are described and compared with other cestodes, and their significance is discussed.
3

Influence of crowding of Hymenolepis diminuta [WMS il1] on structure of strobila

67%
Stradowski M.
Acta Parasitologica
|
1998
|
tom 43
|
nr 1
On average, hermaphroditic proglottids of 10- month-old Hymenolepis diminuta proceeding from WMS il1 contained more testes when tapeworms were cultured in crowded populations (44-48 individuals) than in lower density (4-6 individuals). Furthermore, one average-sized testis from a tapeworm of the crowded population accounted for a relatively greater part of proglottid volume than did one in tapeworms from the low-density populations. These same populations - both low-density and crowded - included tapeworms with unilateral positioning of genital ducts and pores, or with changes in the positioning of these organs in strobilae. This variability is correlated positively with the number of proglottids of type 2p1a (containing two testes on the poral side and one on the aporal), and negatively with the numbers of types 1p2a, 0p3a and 1p3a (P<0.01).
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