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Light and scanning electron microscopic observations of the eggs, daughter rediae, cercariae, and encysted metacercariae ofEchinostoma trivolvis andE. caproni

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Abstract

Light microscopy (LM) and scanning electron microscopy (SEM) were used to determine interspecific differences between various larval stages of 2 allopatric species of 37-collar-spined echinostomes,Echinostoma caproni andE. trivolvis. The abopercular and embryo diameters of the eggs ofE. trivolvis were significantly different from those ofE. caproni. The abopercular knobs ofE. caproni andE. trivolvis have shallow and deep infoldings in the eggshells, respectively. Interspecific differences were noted in the tegument, tegumentary papillae, and spherical bodies around the mouth and in the papilliform process of the two rediae. The cercaria ofE. caproni has one ventral tail fin-fold, whereas that ofE. trivolvis has two; both species have two dorsal tail fin-folds. The outer metacercarial cyst diameter ofE. caproni was significantly greater than that ofE. trivolvis. E. caproni has a smoother outer cyst wall than doesE. trivolvis.

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Authors and Affiliations

  1. Department of Biology, Lafayette College, 18042, Easton, PA, USA

    Kent G. Krejci & B. Fried

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  1. Kent G. Krejci
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  2. B. Fried
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Krejci, K.G., Fried, B. Light and scanning electron microscopic observations of the eggs, daughter rediae, cercariae, and encysted metacercariae ofEchinostoma trivolvis andE. caproni . Parasitol Res 80, 42–47 (1994). https://doi.org/10.1007/BF00932622

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  • DOI: https://doi.org/10.1007/BF00932622

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