Ultrastruktur und Differenzierung der prostatoiden Organe von Polystyliphora filum (Plathelminthes, Proseriata)

Brüggemann, Jochen

doi:10.1007/bf00312022

Cited by 19 publications

(14 citation statements)

References 10 publications

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“…Scale bar = 1 µm . shows that the same applies to stylet structures : again only in the Monocelididae (exclusive of Archimonocelis) are stylets derivatives of the basement membrane, while those in other proseriates are intracellular formations : in Archimonocelis (present paper), in the Coelogynoporidae (Ehlers & Ehlers, 1980 ;present paper), in the Otoplanidae (Lanfranchi, 1978 ;Ehlers & Ehlers, 1980), and in the Polystyliphoridae (Bruggeman, 1984) .…”

Section: Discussionmentioning

confidence: 58%

“…Martens, in preparation), the core of crossbanded fibrils arises first and then becomes enveloped by electron-dense material . In differentiating spines in the cirrus of Cirrifera (Martens, 1984a) and stylets of the prostatoid organs in Polystyliphora filum (Bruggeman, 1984), the framework forming the core consists of a bundle of microtubules . The core of the cross-banded collagen-like fibrils in'the needles of Archimonocelis and in the stylet of Carenscoilia may perhaps be related to the length of the hard structures .…”

Section: Discussionmentioning

confidence: 99%

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Comparative ultrastructure of copulatory organs having a stylet in the Proseriata (Turbellaria)

Martens

1986

Hydrobiologia

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The ultrastructure of male copulatory organs having a stylet has been studied in some genera of the Proseriata .Within the Monocelididae there was a variety of stylet-like hard structures . The stylet in Monocelis fusca was a differentiation of the basement membrane of the epithelium lining a penis-like muscular papilla . The penis papilla in Ectocotyla consisted of circular muscles surrounded by a thickened basement membrane and an epithelium. Archilopsis sp. and Archilina sp . with a duplex copulatory bulb, had a stylet within a spiny cirrus . The stylet in Archilopsis sp. was a cylindrical muscular protrusion with a thickened basement lamina that lined the cirrus lumen . The stylet structure in Archilina sp. was composed of four long spines which were derivatives of the basement membrane. In Ectocotyla multitesticulata and Dupliminona corsicana, the accessory prostatoid organ was provided with a hook-shaped stylet that was differentiated in the basement membrane and of which the material was continuous with the fibrous matrix between the muscles of the prostatic bulb . The stylet and needles in the Archimonocelis species were intracellular differentiations . The copulatory organ in Carenscoilia biforamen consisted of a tubiform stylet and four needles, all of which were also intracellular specializations .I consider copulatory hard structures in the Turbellaria to be taxonomically significant in terms of structure, differentiation, and location (whether subcellular, in the basement membrane, or intracellular) . Hydrobiologia 132, 165-173 (1986).

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Section: Discussionmentioning

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Comparative ultrastructure of copulatory organs having a stylet in the Proseriata (Turbellaria)

Martens

1986

Hydrobiologia

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“…Each of these prostatoid organs has a funnel-shaped stylet with a curved distal part and a flattened projection in the middle; funnel and projection differentiated together in a single cell . Both portions of the stylet exhibited a synchronous formation mode (Bruggemann, 1984) . In an early phase of differentiation, a framework of microtubules was built in the basal part, which later became enveloped by electrondense material .…”

Section: Resultsmentioning

confidence: 99%

“…Until now the ultrastructure of penis stylets and stylet needles of free-living platyhelminths has been investigated in only a few, taxonomically scattered representatives (Mainitz, 1977 ;Ehlers & Ehlers, 1980;Doe, 1982;Bruggemann, 1984) . The differentiation of such hard elements has been described only for the proseriate Carenscoilia bidentata (Ehlers & Ehlers, 1980) and the unguiphore Polystyliphora filum (Bruggemann, 1984) .…”

Section: Introductionmentioning

confidence: 99%

“…The differentiation of such hard elements has been described only for the proseriate Carenscoilia bidentata (Ehlers & Ehlers, 1980) and the unguiphore Polystyliphora filum (Bruggemann, 1984) . In this presentation, ultrastructure and differentiation of genital hard structures in representatives of different groups of free-living platyhelminths are described .…”

Section: Introductionmentioning

confidence: 99%

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Ultrastructural investigations on the differentiation of genital hard structures in free-living platyhelminths and their phylogenetic significance

Br�ggemann

1986

Hydrobiologia

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Ultrastructure and differentiation of penis stylets and stylet needles have been investigated in representatives of various groups of free-living platyhelminths, viz . the Acoela, Macrostomida, Typhloplanoida, Kalyptorhynchia, and Dalyellioida . In all these groups, the differentiation of such hard parts occurs intracellularly but in different ways in the different groups . The ultrastructure of the bursal mouth piece in an acoel platyhelminth is not comparable to the hard structures in male copulatory organs . The presence of penial copulatory organs having intracellular hard structures appears to be an autapomorphy of the Euplatyhelminthes . Several characters in the ultrastructure and development of these structures can be used as autapomorphies for various platyhelminth groups .

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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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Ultrastruktur und Differenzierung der prostatoiden Organe von Polystyliphora filum (Plathelminthes, Proseriata)

Cited by 19 publications

References 10 publications

Comparative ultrastructure of copulatory organs having a stylet in the Proseriata (Turbellaria)

Comparative ultrastructure of copulatory organs having a stylet in the Proseriata (Turbellaria)

Ultrastructural investigations on the differentiation of genital hard structures in free-living platyhelminths and their phylogenetic significance

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

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