Scanning Electron Microscopy of the Scolex of Grillotia dollfusi Carvajal 1971 (Cestoda: Trypanorhyncha)

Whittaker, F. H.; Carvajal, G Juan; Apkarian, Robert P.

doi:10.2307/3281120

Cited by 14 publications

(6 citation statements)

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“…1 surface features are like those of some pseudophyllidean plerocercoids and cyclophyllidean metacestodes. Although palmate microtriches have been found on the tegument of several trypanorhynches (Halton and McKerr 1979;Whittaker et al 1982;McCllough and Fairweather 1983;Andersen 1987;Carvajal et al 1987;Ashour 1991;Richmond and Caira 1991), this feature is absent on the G. gigas plerocercoid tegument, in agreement with the ®nding reported by Caira and Bardos (1996) in the adult stage of G. isuri. Both data contradict the proposal suggested by Richmond and Caira (1991), Whittaker et al (1985), Shields (1985), and Ashour (1991), who considered the palmate microtriches to be a synapomorphy for members of the order Trypanorhyncha.…”

Section: Discussionsupporting

confidence: 88%

Tegumental topography of the plerocercoid of Gymnorhynchus gigas (Cestoda : Trypanorhyncha)

Casado¹,

Urrea²,

Moreno³

et al. 1999

Parasitology Research

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The tegumental topography of the plerocercoid of Gymnorhynchus gigas is described for the first time. The surface features were examined by scanning electron microscopy. Eight different types of microthrix pattern were found. Differences in the shape and density of microtriches depend on their location. A unique morphological feature is reported herein, namely, filamentous microtriches that were arranged in clusters with a dome-shaped pattern when the bothridial surface was relaxed but sunk into a crater when the bothridial surface was contracted. In contrast to other trypanorhynchan cestodes, palmate microtriches are not found on the tegument of this plerocercoid. The microtriches on the caudal extension gradually increased in length with growing distance from the blastocyst, which showed short knob-like structures. These structures developed into elongated filiform microtriches on the posterior region of the caudal extension.

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Section: Discussionsupporting

confidence: 88%

Tegumental topography of the plerocercoid of Gymnorhynchus gigas (Cestoda : Trypanorhyncha)

Casado¹,

Urrea²,

Moreno³

et al. 1999

Parasitology Research

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“…Whittaker et al (1982) reported palmate microtriches with three to eight digitiform extensions in Grillotia dollfusi, but no particular pattern in the arrangement of microtriches with different numbers of digitiform extensions was seen.…”

Section: Discussionmentioning

confidence: 91%

“…The unusual surface features discovered in recent ultrastructural investigations of the scoleces of trypanorhynch tapeworms (e.g., Whittaker et al, 1982;Whittaker et al, 1985) have led a number of authors to suggest that these structures may be of some systematic value (e.g. McCullough & Fairweather, 1983;Shields, 1985;Carvajal et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

Morphological investigations into Floriceps minacanthus (Trypanorhyncha: Lacistorhynchidae) with analysis of the systematic utility of scolex microtriches

Richmond

Caira

1991

Syst Parasitol

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Specimens of Floriceps minacanthus Campbell & Beveridge, 1987 are reported from Carcharhinus melanopterus (Quoy & Gaimard, 1824) taken in the waters surrounding the island of Kirimati in the Republic of Kiribati in the Central Pacific Ocean. This represents a new host and a new locality record. The description of this species is expanded to include the presence of an ovary which is bilobed in cross section and a hermaphroditic duct. The surface features were examined by scanning electron microscopy. With the exception of the lateral margins of the bothridia and the apical region of the scolex, the scolex was found to be covered with palmate microtriches interspersed with filiform microtriches. The palmate microtriches varied in number of digitiform extensions depending on location. Elongate, bifid microtriches were present in the transition zone between the proximal and distal surfaces along the lateral margins of the bothridia. The apical region of the scolex was covered with filiform microtriches. The surface of the anterior margin of the strobila was covered with broad, flattened scale-like structures. The pattern of microthrix distribution was repeated for each of the bothridia of an individual, and this pattern was intraspecifically invariable. Comparison of our results with those from the seven other trypanorhynch species examined by previous authors with SEM indicates that there is much interspecific variability in both the morphology of microtriches present as well as their location on the scolex. This, coupled with the lack of intraspecific variability, confirms that these structures are systematically informative.

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“…Halton and McKerr 1979;Whittaker et al 1982Whittaker et al , 1985Shields 1985;Campbell and Beveridge, 1987;Richmond and Caira 1991;Palm 1995Palm , 2004Beveridge and Campbell 2001), being present also in the related Diphyllidea and in other primitive tapeworms. Consequently, Richmond and Caira (1991) suggested the presence of palmate microtriches as a synapomorphy of the members of Trypanorhyncha, as the species examined presented this type of microtriche on their scolex.…”

Section: Discussionmentioning

confidence: 96%

First record of Progrillotia dasyatidis Beveridge Neifar and Euzet, 2004 (Cestoda: Trypanorhyncha) plerocerci from Teleost fishes off the Portuguese coast, with a description of the surface morphology

et al. 2005

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Plerocerci of Progrillotia dasyatidis Beveridge et al. (2004), family Progrillotiidae Palm (2004), are reported from several teleost fishes off the Portuguese coast, giving a first insight into the life cycle biology of these unique trypanorhynchs. The first description and assignment of the plerocercus to P. dasyatidis is based on morphological features, such as scolex and bothria morphology and tentacular hook arrangement, and is expanded to incorporate the surface morphology, examined by scanning electron microscopy, constituting the first ultrastructural study for a species within this family. Comparisons with other species of the genus Progrillotia are made, based on the scolex and bothria morphology and tentacular hook arrangement, in order to give an overview into the variability within this genus, whereas comparisons with adults from the same species evidence the variability within the same species. The systematic approaches of Campbell and Beveridge (1994) and Palm (1997, 2004) are discussed and emphasis is placed on the utility of microtriches and the characteristic life cycle within the genus as systematic characters.

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Scanning Electron Microscopy of the Scolex of Grillotia dollfusi Carvajal 1971 (Cestoda: Trypanorhyncha)

Cited by 14 publications

References 0 publications

Tegumental topography of the plerocercoid of Gymnorhynchus gigas (Cestoda : Trypanorhyncha)

Tegumental topography of the plerocercoid of Gymnorhynchus gigas (Cestoda : Trypanorhyncha)

Morphological investigations into Floriceps minacanthus (Trypanorhyncha: Lacistorhynchidae) with analysis of the systematic utility of scolex microtriches

First record of Progrillotia dasyatidis Beveridge Neifar and Euzet, 2004 (Cestoda: Trypanorhyncha) plerocerci from Teleost fishes off the Portuguese coast, with a description of the surface morphology

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