Aporocotyle simplex (Odhner, 1900)
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publication ID |
https://doi.org/ 10.1016/j.jcz.2023.05.003 |
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DOI |
https://doi.org/10.5281/zenodo.10375355 |
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persistent identifier |
https://treatment.plazi.org/id/03CA3B6F-F337-FFCD-FF82-D2B1FB8BC6D4 |
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treatment provided by |
Felipe |
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scientific name |
Aporocotyle simplex |
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3.1. The anterior foregut of A. simplex View in CoL
With SEM, the anterior extremity of the A. simplex body has an anterior depression opening into the mouth cavity ( Fig. 1A View Fig ). In LM
Fig. 1B and C View Fig the long esophagus surrounded by the compact cellular masses, which extend up to the bifurcation of the H-shaped caecum, may be clearly seen, with shorter right and left anterior caeca and longer right and left posterior caeca, which end near the posterior extremity ( Fig. 1B View Fig ). In TEM longitudinal sections, the mouth cavity is funnelshaped ( Fig. 1D–F View Fig ), and the ciliated sensory endings are located around the mouth cavity ( Fig. 1E View Fig ). The syncytial lining of the anterior foregut is continuous with the distal syncytial tegumental cytoplasm of the body and both have similar cytoplasmic inclusions, electron-dense tegumental bodies and vesicular inclusions ( Fig. 1E and H View Fig ). The syncytial lining of the body and anterior foregut is surrounded by thin basal lamina and a thick extracellular basal matrix separates the syncytial cytoplasm from the underlying muscle fibres; their luminal surface bears irregular knob-like outgrowths ( Fig. 1E and H View Fig ). Behind the mouth cavity, the foregut syncytial lining (about 15–22 μm in the length) is surrounded by circular and radial muscle fibres ( Fig. 1D, F, G View Fig ). Directly beneath the extracellular matrix surrounding this foregut region (muscular anterior foregut), circular muscle fibres are arranged into 8–10 isolated bands on each canal side ( Fig. 1D–G View Fig ). Radial muscle fibres appear to run between the circular bands ( Fig. 1E, F, I View Fig ). These radial fibres represent the branchings of two powerful radial bands of antero-lateral orientation situated on both sides of this foregut region ( Fig. 1D F, G View Fig ). The distal margins of the radial muscles are attached by hemidesmosomes to the canal extracellular matrix ( Fig. 1I View Fig ). The muscle fibres of the anterior foregut are supplied with nerve fibres ( Fig. 1F View Fig ). Some deep lateral folds of the distal epithelial layer may be observed along the anterior foregut ( Fig. 1E, F, G View Fig ).
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