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FIGURE 2. Typhlopolycystis caeca Karling, 1956 in On the genus Typhlopolycystis Karling, 1956 (Platyhelminthes, Kalyptorhynchia, Polycystididae), with data on the five known species and the description of eleven new species
No full textFIGURE 2. Typhlopolycystis caeca Karling, 1956. Copulatory organ (A) in the holotype and (B) of an individual from Sylt. (scale = 20 µm)Published as part of Schockaert, Ernest R., Moons, Patricia, Janssen, Toon, Tessens, Bart S., Reygel, Patrick C., Revis, Nathalie, Jouk, Philippe E. H., Willems, Wim R. & Artois, Tom J., 2019, On the genus Typhlopolycystis Karling, 1956 (Platyhelminthes, Kalyptorhynchia, Polycystididae), with data on the five known species and the description of eleven new species, pp. 81-104 in Zootaxa 4603 (1) on page 85, DOI: 10.11646/zootaxa.4603.1.4, http://zenodo.org/record/267330
Dealing with a taxonomic Gordian knot: phylogeny of and cryptic diversity in Gyratrix hermaphroditus Ehrenberg, 1831 (Platyhelminthes: Rhabdocoela, Kalyptorhynchia)
No full textnot availabl
Dealing with a taxonomic Gordian knot: phylogeny of and cryptic diversity in Gyratrix hermaphroditus Ehrenberg, 1831 (Platyhelminthes: Rhabdocoela, Kalyptorhynchia)
No full textnot availabl
Four new species of the genus Paraustrorhynchus (Rhabdocoela: Kalyptorhynchia: Polycystididae)
No full textLin, Yitao, Reygel, Patrick, Feng, Weitao, Chen, Jiajia, Tessens, Bart, Van Steenkiste, Niels W. L., Schockaert, Ernest R., Artois, Tom J., Wang, Antai (2019): Four new species of the genus Paraustrorhynchus (Rhabdocoela: Kalyptorhynchia: Polycystididae). Zootaxa 4550 (3): 357-373, DOI: 10.11646/zootaxa.4550.3.
FIGURE 6. Polycystis ali Schockaert, 1982 A, Prostate stylet type I in Polycystididae (Rhabditophora: Rhabdocoela: Kalyptorhynchia) from the Indian Ocean, with the description of twelve new species
No full textFIGURE 6. Polycystis ali Schockaert, 1982 A, Prostate stylet type I, side view (from a specimen from Kenya). B, Prostate stylet type I, view from below (from a specimen from Kenya). Polycystis elsae n. sp. C, Prostate stylet type I (from the holotype).Published as part of Artois, Tom J. & Tessens, Bart S., 2008, Polycystididae (Rhabditophora: Rhabdocoela: Kalyptorhynchia) from the Indian Ocean, with the description of twelve new species, pp. 1-27 in Zootaxa 1849 on page 23, DOI: 10.5281/zenodo.18337
FIGURE 3. Protoplanella simplex Reisinger, 1924 in Dalytyphloplanida (Platyhelminthes: Rhabdocoela) from Andalusia, Spain, with the description of four new species
No full textFIGURE 3. Protoplanella simplex Reisinger, 1924. Habitus based on observations on live animals and serial sections.Published as part of Steenkiste, Niels Van, Tessens, Bart, Krznaric, Kathleen & Artois, Tom, 2011, Dalytyphloplanida (Platyhelminthes: Rhabdocoela) from Andalusia, Spain, with the description of four new species, pp. 1-29 in Zootaxa 2791 on page 6, DOI: 10.5281/zenodo.20110
A tool for feeding and mating: The Swiss Army stylet of Gyratrix hermaphroditus
No full textFree-living flatworms are famous for their intriguing copulatory strategies, yet microturbellarian reproductive biology remains poorly characterised. Through direct and histological observations, we further elaborate on the copulation mechanism within the rhabdocoel species complex Gyratrix hermaphroditus (Polycystididae, Kalyptorhynchia). Mating behavior is shown to involve a sequence of events, including precopulatory ‘sniffing’ and ‘rolling’, followed by simultaneous insertion of the stylet sheath in the bursa of the partner and stylet ejection. Respective durations of these events are measured and reported. As parts of the male system are also used in foraging, we also report on the feeding mechanism of these animals: the stylet is used to puncture the prey’s body wall, and the contents of the prostate vesicle are ejected, after which the worm uses its pharynx to feed on its prey’s body contents. We suspect that negative genetic correlations due to the twofold role of the male copulatory organ may constrain the evolution of this character and possibly explains the relative morphological stasis for this trait in G. hermaphroditus.We wish to thank Mrs Natascha Steffanie for preparing the histological sections of Gyratrix hermaphroditus and Mrs Ria Vanderspikken for administrative support
A tool for feeding and mating: the Swiss Army stylet of Gyratrix hermaphroditus (Rhabdocoela, Platyhelminthes)
No full textFree-living flatworms are famous for their intriguing copulatory strategies, yet microturbellarian reproductive biology remains poorly characterised. Through direct and histological observations, we here elucidate the copulation mechanism within the cosmopolitan rhabdocoel species complex Gyratrix hermaphroditus Ehrenberg, 1831 (Polycystididae, Kalyptorhynchia). The sclerotized reproductive organs of these animals were visualized through Differential Interference Microscopy and Scanning Electron Microscopy. Mating behaviour is shown to constitute a sequence of events, including precopulatory ‘sniffing’ and ‘rolling’, followed by simultaneous insertion of the stylet sheath in the copulatory bursa of the partner and stylet ejection. Respective durations of these events were measured. As the copulatory organ is also used in foraging, we also report on the feeding mechanism of these animals: the stylet is used to puncture the prey’s body wall and the contents of the prostate vesicle are ejected, after which the worm uses it pharynx to feed on its prey’s body fluids. We suggest that the twofold role of the male copulatory organ may confine the evolutionary plasticity of this character trait, possibly explaining the morphological stasis in G. hermaphroditus
FIGURE 2. Paraustrorhynchus neleae n in Polycystididae (Rhabditophora: Rhabdocoela: Kalyptorhynchia) from the Indian Ocean, with the description of twelve new species
No full textFIGURE 2. Paraustrorhynchus neleae n. sp. A, Habitus (from a live animal). B, H, Prostate stylet type II (from the holotype). C, I, Prostate stylet type III (from the holotype). P. elixus. D, Prostate stylet type III (from a specimen from Kenya). E, Prostate stylet type II (from the same specimen from Kenya). F, Prostate stylet type III (from a specimen from Brazil). G, Prostate stylet type II (from the same specimen from Brazil). J, Prostate stylet type III (from a specimen from New Caledonia). Arrows explained in the text.Published as part of Artois, Tom J. & Tessens, Bart S., 2008, Polycystididae (Rhabditophora: Rhabdocoela: Kalyptorhynchia) from the Indian Ocean, with the description of twelve new species, pp. 1-27 in Zootaxa 1849 on page 8, DOI: 10.5281/zenodo.18337
FIGURE 8 in Kalyptorhynchia (Platyhelminthes: Rhabdocoela) from KwaZulu-Natal (South Africa), with the description of six new species
No full textFIGURE 8. Cheliplana pileola Jouk & De Vocht, 1989. A. General organisation (from a live specimen). B. Proboscis hook. C. Distal part of ejaculatory duct with cirrus and enveloping papilla. Carcharodorhynchus spec. D. Proboscis. E. Cirrus.Published as part of Willems, Wim R., Reygel, Patrick, Steenkiste, Niels Van, Tessens, Bart & Artois, Tom J., 2017, Kalyptorhynchia (Platyhelminthes: Rhabdocoela) from KwaZulu-Natal (South Africa), with the description of six new species, pp. 441-466 in Zootaxa 4242 (3) on page 462, DOI: 10.11646/zootaxa.4242.3.2, http://zenodo.org/record/37690
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