Light and transmission electron microscopical studies and amino acid analysis of the metacercarial cyst of Zygocotyle lunata (Trematoda)

Robbins, Sanford H.; Hammett, Margaret; Fried, Bernard

doi:10.1016/0020-7519(79)90037-7

Cited by 6 publications

(1 citation statement)

References 8 publications

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“…The fine structure of the tegument of digenean larvae has been well documented and much of the literature has been reviewed by ERASMUS (1972), THREADGOLD (1984) and FRIED & HASEEB (1991). Ultrastructural studies on larval paramphistomes, however, are limited to a brief description of the metacercarial cyst of Zygocotyle lunata by ROBBINS et al (1979).…”

Section: Introductionmentioning

confidence: 99%

Ultrastructural observations on the redial tegument of Paramphistomum epiclitum from the planorbid snail, Indoplanorbis exustus

et al. 1992

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The morphology of the tegument in the redia of Paramphistomum epiclitum (Digenea: Paramphistomidae) resembles that shown by most larval and adult digeneans; an outer surface syncytium is in continuity with the cytoplasm of in-sunken, nucleated cytons. Although tegumental cytons usually contain a single nucleus, some display up to six nuclei. The tegumental syncytium lining the pharynx of P. epiclitum rediae lack underlying cytons. The apical membrane of the tegument is elaborated by folds and microvilli, which presumably facilitate uptake of nutrients and/or exchange of ions involved in osmoregulation. A single type of secretory body, resulting from the fusion of smaller vesicles produced at Golgi complexes in the cytons, occurs throughout the tegument. Uniciliate sensory receptors occur in the surface syncytium particularly around the oral opening.

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Section: Introductionmentioning

confidence: 99%

Ultrastructural observations on the redial tegument of Paramphistomum epiclitum from the planorbid snail, Indoplanorbis exustus

et al. 1992

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Physico-chemical conditions necessary for the in vitro excystment ofzygocotyle lunata (Trematoda: Paramphistomatidae)

Irwin¹,

O'Kane²,

Fried

1993

Parasitol Res

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Various physico-chemical factors associated with the in vitro excystment of metacercariae of Zygocotyle lunata were studied. Metacercariae could excyst with or without the presence of trypsin or bile salts, although the rate of excystation was slower in the absence of both. Crude ox-bile extract promoted faster excystment than did more refined sodium taurocholate. Pretreatment of cysts with pepsin also resulted in faster excystment rates. Optimal excystation occurred at 40 degrees C and between pH 5.5 and 7.5. The broad pH and temperature ranges and the non-specific enzyme/bile salt requirements for excystation were correlated with the wide range of vertebrate hosts used by this trematode.

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Amino Acid Metabolism in Helminths

Barrett¹

1991

Advances in Parasitology

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Light and transmission electron microscopical studies and amino acid analysis of the metacercarial cyst of Zygocotyle lunata (Trematoda)

Cited by 6 publications

References 8 publications

Ultrastructural observations on the redial tegument of Paramphistomum epiclitum from the planorbid snail, Indoplanorbis exustus

Ultrastructural observations on the redial tegument of Paramphistomum epiclitum from the planorbid snail, Indoplanorbis exustus

Physico-chemical conditions necessary for the in vitro excystment ofzygocotyle lunata (Trematoda: Paramphistomatidae)

Amino Acid Metabolism in Helminths

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