Ultrastructure of copulatory organs in Turbellaria

Doe, David A.

doi:10.1007/bf00312029

Cited by 28 publications

(7 citation statements)

References 15 publications

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“…These results are consistent with the intracellular nature of stylets in Acoela (Mainitz, 1977), Macrostomida (Doe, 1982), and Proseriata (Ehlers & Ehlers, 1980 ;Lanfranchi, 1978 ;Bruggemann, 1984) .…”

Section: Discussionsupporting

confidence: 82%

“…As in other turbellarian intracellular stylets, there are prominent dictyosomes, ribosomes, and electron-dense material in the proximal region of the matrix syncytium and of the spine cells (see Ehlers & Ehlers, 1980;Doe, 1982;Bruggemann, 1984) . My use of adult specimens of H. quadristimulus precludes any developmental information .…”

Section: Discussionmentioning

confidence: 88%

“…and Microstomum sp . (Doe, 1982), but they may have been obscured by electron-dense material in the adult specimens . Bruggemann (1984) has shown that the stylet of the prostatoid organ in Polystyliphora filum is built on a framework of microtubules .…”

Section: Discussionmentioning

confidence: 99%

“…Although a connection to basal bodies and cilia may be obligate to justify using the term 'ciliary rootlet' (Flood, 1975), rootlet-like structures have been seen in non-ciliated cells (Nagano, 1962 ;Sakaguchi, 1965 ;Doe, 1982) . The striation periodicities of 65-71 nm in the rootlets, rootlet-like ribbons, stylet, and spines fall within the 12-90 nm range frequently cited for ciliary rootlets and (extracellular) collagen (see Flood, 1975 ;Olson & Rattner, 1975;Larson & Dingle, 1981) .…”

Section: Discussionmentioning

confidence: 99%

“…and Macrostomum sp. (Doe, 1982), and with intracellular proboscis hooks in Gnathorhynchus sp . (Doe, 1976) .…”

Section: Discussionmentioning

confidence: 99%

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Ultrastructure of the copulatory stylet and accessory spines in Haplopharynx quadristimulus (Turbellaria)

Doe

1986

Hydrobiologia

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The copulatory organ of Haplopharynx quadristimulus Ax, 1971 (Carolina form, Rieger, 1977 consists of a proximal prostatic vesicle and a distal stylet apparatus comprising a central tubular stylet and four to five peripheral accessory spines . By electron microscopy it could be seen that the stylet and spines were intracellular specializations . The copulatory organ can be interpreted as a specialization of an epithelial canal extending from the testes to the body wall . In the complex stylet apparatus, the epithelium was differentiated into six cell types. The stylet, which was formed in a matrix syncytium next to the prostatic vesicle, extended into the lumen of the stylet canal . The interior of the stylet apparatus contained one group of cells that had thick ciliary rootlets and another that had rootlet-like ribbons .The cells that contain the rootlets enveloped bundles of longitudinally arranged muscles. The accessory spines were formed in cells which lay peripheral to the muscle bundles . The spines, stylet, rootlet-like ribbons, and rootlets had similar patterns of periodic cross striations . The similarity in striation patterns suggests that the accessory spines and stylet are composed of modified ciliary rootlets. Hydrobiologia 132, 157-163 (1986).

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…and Macrostomum sp. (Doe, 1982), and with intracellular proboscis hooks in Gnathorhynchus sp . (Doe, 1976) .…”

Section: Discussionmentioning

confidence: 99%

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Ultrastructure of the copulatory stylet and accessory spines in Haplopharynx quadristimulus (Turbellaria)

Doe

1986

Hydrobiologia

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Ultrastructure and tubulin immunocytochemistry of the copulatory stylet‐like structure in Childia species (Acoela)

Tekle

Raikova

Justine

et al. 2007

Journal of Morphology

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One of the main characters used in acoel taxonomy is the male copulatory organ. Despite this, ultrastructural studies of this structure are scarce. We studied the ultrastructure of the copulatory organ in eight species of acoels belonging to the taxon Childia. Members of Childia possess a well-developed conical or cylindrical stylet-like structure composed of needles. Immunogold cytochemistry of tubulin was used to determine the composition of the needles. Stylet-like structures of Childia species at the ultrastructural level are basically similar. Stylet needles show intracellular differentiations. As shown both by ultrastructural and immunocytochemical methods, the stylet needles, in all species studied, are composed of long, parallel microtubules, either tightly packed or polymerized. We report unusual polymerization of microtubules, resulting in formation of a honeycomb-like structure in cross section. Variations of ultrastructure among Childia species include numbers and arrangement of stylet needles, shape of needles, needle compactness, microtubule polymerization, direction of stylet growth, and presence/absence of different types of granules. The stylet-like structures are homologous within Childia, but are likely to prove nonhomologous with the other needle-like structures found in acoel copulatory organs. Stylets in Platyhelminthes are not homologous with stylet-like structures in acoels.

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The adult musculature of two pseudostomid species reveals unique patterns for flatworms (Platyhelminthes, Prolecithophora)

Grosbusch

Bertemes

Egger

2019

Journal of Morphology

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We analyzed the adult musculature of two prolecithophoran species, Cylindrostoma monotrochum (von Graff, 1882) and Monoophorum striatum (von Graff, 1878) using a phalloidin‐rhodamine technique. As in all rhabdithophoran flatworms, the body‐wall musculature consisted of three muscle layers: on the outer side was a layer of circular muscle fibers and on the inner side was a layer of longitudinal muscle fibers; between them were two different types of diagonally orientated fibers, which is unusual for flatworms. The musculature of the pharynx consisted of a basket‐shaped grid of thin longitudinal and circular fibers. Thick anchoring muscle fibers forming a petal‐like shape connected the proximal parts of the pharynx with the body‐wall musculature. Male genital organs consisted of paired seminal vesicles, a granular vesicle, and an invaginated penis. Peculiar ring‐shaped muscles were only found in M. striatum, predominantly in the anterior body part. In the same species, seminal vesicles and penis only had circular musculature, while in C. monotrochum also longitudinal musculature was found in these organs. Female genital organs were only present in M. striatum, where we characterized a vagina interna, and a bursa seminalis. Transverse, crossover, and dorsoventral muscle fibers were lacking in the middle of the body and greatly varied in number and position in both species.

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Ultrastructure of copulatory organs in Turbellaria

Cited by 28 publications

References 15 publications

Ultrastructure of the copulatory stylet and accessory spines in Haplopharynx quadristimulus (Turbellaria)

Ultrastructure of the copulatory stylet and accessory spines in Haplopharynx quadristimulus (Turbellaria)

Ultrastructure and tubulin immunocytochemistry of the copulatory stylet‐like structure in Childia species (Acoela)

The adult musculature of two pseudostomid species reveals unique patterns for flatworms (Platyhelminthes, Prolecithophora)

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