188,209 research outputs found
Lepadella hanneloreae Luo & Segers 2020, n. sp.
No full text<i>Lepadella hanneloreae</i> n. sp. <p>Figures 5 a–c, I-4</p> <p> <b>Type locality.</b> Lohulu River near Bomane, DR Congo 24 May 2010 (KM49, KM48); a few specimens from Yangambi primary forest, DR Congo, 11 June 2012 (Y25). Numerous additional specimens in the samples from the type locality.</p> <p> <b>Material examined.</b> Holotype: female specimen in permanent slide, deposited in RBINS (RIR.292); Paratypes: seven permanent slides containing one female specimen each, deposited in RBINS; five permanent slides containing two female specimens each, deposited in RBINS (RIR.293 to RIR.304), one permanent slide containing three female specimens, deposited in CSB-UK.</p> <p> <b>Differential diagnosis.</b> <i>Lepadella hanneloreae</i> <b>n. sp.</b> is strikingly similar to <i>L. amazonica</i> Segers, 1993 (in Segers <i>et al</i>. 1993b). The two differ by the dorsal carinae on the lorica: in <i>L. hanneloreae</i> <b>n. sp.</b> there is one pair of middorsal and one pair of lateral carinae, whereas in <i>L. amazonica</i> there are two pairs of closely adjacent lateral carinae. Furthermore, the new species is probably related to <i>L. berzinsi</i> Segers, 1993, but the latter has three pairs of more pronounced carinae situated at regular distances from each other.</p> <p> <b>Description.</b> Parthenogenetic female (male unknown): Lorica elongate, roughly egg-shaped, width about two thirds of length. Ventral lorica flat, dorsal domed, lorica about twice as wide as high. Head aperture ventrally a deep V-shaped sinus, dorsally semi-circular in anterior view, straight in ventral view, with stippled collar. Dorsal lorica with two pairs of longitudinal carinae: one median pair, fused in the distal third of the lorica, one lateral pair running from behind the collar to approximately level of the apertures to the dorsal antennas. Lateral edges of lorica smooth, evenly curved, posterior edge nearly straight or with a shallow median notch. Apertures to the lateral antennas situated at the level of the anterior margin of the foot aperture, arranged symmetrically about medially from the fused median carinas to the lateral margin of the lorica. Foot aperture elongate, lateral margins nearly parallel. Foot with three distinct pseudosegments, the distal one about twice as long as the second, bearing a dorsal sensory groove near its basis. Two equal toes, these evenly tapering to distally.</p> <p> <b>Measurements</b> (n=10). Lorica length: 91–106 (100), width: 60–70 (67); head aperture width: 23–37 (29), head aperture depth dorsally: 7–14 (10), ventrally: 19–24 (21); foot aperture width: 18–20 (19), length: 23–33 (27), toe length: 22–29 (25).</p> <p> <b>Etymology.</b> The specific name is as a noun in the genitive case, after Mrs Hannelore Segers, daughter of the second author of this paper.</p>Published as part of <i>Luo, Yongting & Segers, Hendrik, 2020, Eight new Lepadellidae (Rotifera, Monogononta) from the Congo bring to level endemism in Africa's rotifers, pp. 371-387 in Zootaxa 4731 (3)</i> on pages 374-376, DOI: 10.11646/zootaxa.4731.3.6, <a href="http://zenodo.org/record/3653632">http://zenodo.org/record/3653632</a>
Scientific thinking in kindergarten
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170681.pdf (Publisher’s version ) (Open Access)Radboud University, 07 juni 2017Promotores : Verhoeven, L.T.W., Segers, P.C.J.167 p
The role of linguistic diversity in early reading comprehension
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214843.pdf (Publisher’s version ) (Open Access)Radboud University, 14 januari 2020Promotores : Verhoeven, L.T.W., Segers, P.C.J.175 p
Lepadella yangambi Luo & Segers 2020, n. sp.
No full text<i>Lepadella yangambi</i> n. sp. <p>Figures 8 a–d, I-8</p> <p> <b>Type locality.</b> Yangambi primary forest, DR Congo, 11 June 2012 (Y27).</p> <p> <b>Material examined.</b> Holotype: One female specimen in permanent slide, deposited in RBINS (RIR.321); Paratypes: seven permanent slides containing one female specimen each, and three permanent slides containing two female specimens each, deposited in RBINS (RIR.322 to RIR.331); two permanent slides containing three female specimens each, CSB-UK; one permanent slide containing five female specimens, deposited in SHNU; numerous additional specimens in the sample from the type locality.</p> <p> <b>Differential diagnosis.</b> <i>Lepadella yangambi</i> <b>n. sp.</b> can be confused with <i>Lepadella bidentata</i> Voronkov, 1913 and <i>L. dactyliseta</i> (Stenroos, 1898). While the posterior spines are clearly set off from the lorica in <i>L. yangambi</i> <b>n. sp.</b> and formed as extensions of the lorica in the other taxa, the deeply invaginated dorsal head aperture margin and blunt sublongitudinal ridges on the dorsal lorica are unique to <i>L. yangambi</i> <b>n. sp.</b> Finally, the new species has a much higher lorica than <i>L. biloba</i> Hauer, 1958.</p> <p> <b>Differential diagnosis.</b> Parthenogenetic female (male unknown): Lorica elongate, elliptical, width about two thirds of length. Ventral lorica relatively flat, dorsally strongly domed, lorica less than twice as wide as high. Dorsal lorica ornamented by a pair of sublongitudinal, sublateral, blunt ridges starting near the head aperture, and running to near the openings of the dorsal antennas. Head aperture ventrally a deep U- or V-shaped sinus, dorsally semi-circular in anterior view, broadly U-shaped in ventral view, no collar. Lateral edges of lorica smooth, evenly curved, posterior edge convex. Apertures to the lateral antennas situated at the level of the first foot pseudosegment in contracted specimens, arranged symmetrically about medially from the longitudinal symmetry axis to the lateral margins of the lorica. Foot aperture elongate, broadest medially, lateral margins converging to both anteriorly and posteriorly. Foot with three distinct pseudosegments, the distal one slightly longer than the second, bearing a dorsal sensory groove near its basis. Two equal toes, these evenly tapering to distally.</p> <p> <b>Measurements</b> (n=10). Lorica length: 75–82 (77), lorica width: 58–75 (61), head aperture width: 23–28 (25), depth dorsally: 5–12 (7), ventrally: 15–20 (18), foot aperture width: 12–18 (14), length: 18–19 (18), toe length: 17–21 (19).</p> <p> <b>Etymology.</b> This specific name is a noun in apposition, derived from the name of its type locality, Yangambi primary forest.</p>Published as part of <i>Luo, Yongting & Segers, Hendrik, 2020, Eight new Lepadellidae (Rotifera, Monogononta) from the Congo bring to level endemism in Africa's rotifers, pp. 371-387 in Zootaxa 4731 (3)</i> on page 378, DOI: 10.11646/zootaxa.4731.3.6, <a href="http://zenodo.org/record/3653632">http://zenodo.org/record/3653632</a>
Children's digital text comprehension
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138657.pdf (Publisher’s version ) (Open Access)Radboud Universiteit Nijmegen, 16 maart 2015Promotor : Verhoeven, L.T.W. Co-promotor : Segers, P.C.J.171 p
Enhancing word reading fluency in beginning readers
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150852.pdf (Publisher’s version ) (Open Access)Radboud Universiteit Nijmegen, 18 januari 2016Promotor : Verhoeven, L.T.W. Co-promotor : Segers, P.C.J.143 p
Lepadella wilungulai Luo & Segers 2020
No full text<i>Lepadella wilungulai</i> n. sp <p>Figures 9 a–c, I-6</p> <p> <b>Type locality.</b> Lulu River near Basoko, DR Congo 21 May 2010 (KM27).</p> <p> <b>Material examined.</b> Holotype: one female specimen in permanent slide, deposited in RBINS (RIR.320).</p> <p> <b>Differential diagnosis.</b> The three exceptionally well-developed dorsal carinae of <i>L. wilungulai</i> <b>n. sp.</b> distinguish the species unequivocally from all congeners. The only species with which the animal might be compared is <i>L. donneri</i> Koste, 1972 which has very similar lateral carinae but which lacks the dorsal carina and which has a more rounded lorica. A third, unnamed Neotropical relative recorded by Koste & Böttger (1992) as “ <i>Lepadella quinquecostata</i> nov. forma?” and by José de Paggi (2001) as <i>L. quinquecostata</i> also has extraordinarily developed carinae, but this animal has five, less developed and differently situated carinae, is larger, and has a differently shaped lorica.</p> <p> <b>Differential diagnosis.</b> Parthenogenetic female (male unknown): Lorica elongate, roughly egg-shaped, width about two thirds of length. Ventral lorica nearly flat, dorsal domed, lorica about twice as wide as high. Head aperture ventrally a deep U-shaped sinus, dorsally semi-circular in anterior view, a broad U-shaped sinus in ventral view, with collar. Dorsal lorica with three longitudinal carinae: one median, and a pair of lateral carinas running from the anterior tips of the lorica to just anterior of the apertures to the dorsal antennas. Dorsal carina extremely high and narrow. Lateral edges of lorica smooth, evenly curved, posterior edge with a minute convex projection as extension of the dorsal carina. Apertures to the lateral antennas situated at the level of the anterior margin of the foot aperture, arranged symmetrically about medially from the middorsal carina to the lateral margin of the lorica. Foot aperture elongate, lateral margins nearly parallel. Foot with three distinct pseudosegments, the distal one about thrice as long as the second, bearing a dorsal sensory groove near its basis. A pair of equal-sized toes present, these almost parallel-sided proximally, more strongly tapering from about midway to distally.</p> <p> <b>Measurements</b> (n=1). Lorica length: 117, width: 86; Head aperture width: 24, head aperture depth dorsally: 8, ventrally: 19, Foot aperture width: 16, length: 30, toe length: 33.</p> <p> <b>Etymology.</b> The specific name is as a noun in the genitive case, dedicated to Dr Father Cosma Wilungula, Executive director of the Institut Congolais pour la Conservation de la Nature, in recognition of his contribution to nature conservation in the Democratic Republic of Congo.</p> <p> <b>Remark.</b> We acknowledge that describing and naming a new rotifer species based on a single specimen is a practice frowned upon, for good reasons, by numerous authorities including, e.g., Ruttner-Kolisko (1989) and Koste & Shiel (1989). However, the unique features of the holotype, the outstandingly easy diagnosis and the potential biogeographical relevance of the animal convince us to exceptionally proceed with the description and establishment of a new name for the single specimen discovered.</p>Published as part of <i>Luo, Yongting & Segers, Hendrik, 2020, Eight new Lepadellidae (Rotifera, Monogononta) from the Congo bring to level endemism in Africa's rotifers, pp. 371-387 in Zootaxa 4731 (3)</i> on page 377, DOI: 10.11646/zootaxa.4731.3.6, <a href="http://zenodo.org/record/3653632">http://zenodo.org/record/3653632</a>
Ptygura thalenoiensis Meksuwan, Pholpunthin & Segers, 2011, new species
No full text<i>Ptygura thalenoiensis</i> new species <p>(Figs 6–7)</p> <p> Synonym: <i>Ptygura</i> sp. near <i>linguata</i> Edmondson, 1939 <i>after</i> Segers <i>et al</i>., 2011 (Figs 9 –12)</p> <p> <b>Type material.</b> Holotype female (PSUZC-PK5PM001-01) was deposited in Princess Maha Chakri Sirindhorn Natural History Museum, Prince of Songkla University, Songkhla, Thailand; two paratype females deposited in RBINS, BRUSSELS, GI 31863 RIR 202-203.</p> <p> <b>Type locality.</b> Thale Noi Lake, Phatthalung province, Thailand: 7o 45’ 44’’ N to 7o 48’ 26’’ N and longitude 100o 7’ 31’’ E to 100o 11’ 12’’ E, June 2009 through April 2010.</p> <p> <b>Differential diagnosis.</b> The new species belongs to a group of congeners that are diagnosed by having elongate lateral antenna. Amongst those, <i>P. thalenoiensis</i> <b>n. sp.</b> is distinguished by the presence of a pair of apical hooks in addition to a tongue-shaped projection in between those, and of an autapomorphic ciliated projection in its mouth region.</p> <p> <b>Description.</b> Body well separated from the elongate, retractible foot, terminating in a medium to long peduncle. Corona elliptic, twice as wide as trunk; dorsal gap minute; corona supported by relatively strong rods. Buccal area with distinct short and cylindrical projection bearing a group of elongate cilia terminally. Neck region distinct, with two sharp dorsal hooks lateral to a tongue-shaped projection, this projection protruding beyond, but less rigid than the hooks. Lateral antenna long and slender. Tube gelatinous, containing fine perpendicular lines of material radiating from the inside of the tube. Fine layers radiated from inner sheath; light to medium brown; inner sheath obvious, quite parallel along tube to. Male unkown.</p> <p>Trophi nearly symmetrical, malleoramate. Unci left and right 17 teeth, these weakly differentiated into a proximal group containing 3 slightly stronger teeth and a distal group of weaker teeth (3–4 teeth); second tooth in the left group of proximal teeth small. Teeth in the distal group interdigitating with rami scleropilli (visible most in the left group). Fulcrum short, with a weakly developed basal plate.</p> <p> <b>Measurements.</b> Females total length ca. 700 µm. Trunk length ca. 150–230 µm, width ca. 40–50 µm. Foot length ca. 200–450 µm. Foot stalk length ca. 15–60 µm. Corona height ca. 90 µm, width ca. 140 µm, width/height ratio ca. 1.6. Lateral antenna length ca. 80 µm.</p> <p> <b>Etymology.</b> The species name <i>thalenoiensis</i> is an adjective, derived from the type locality of the species.</p> <p> <b>Distribution.</b> In addition to the type locality, the new species is known from Cambodia (sub. <i>Ptygura</i> cf. <i>linguata,</i> Segers <i>et al.,</i> 2011). Apparently, it is endemic to Southeast Asia.</p>Published as part of <i>Meksuwan, Phuripong, Pholpunthin, Pornsilp & Segers, Hendrik, 2011, Diversity of sessile rotifers (Gnesiotrocha, Monogononta, Rotifera) in Thale Noi Lake, Thailand, pp. 1-18 in Zootaxa 2997</i> on page 12, DOI: <a href="http://zenodo.org/record/207999">10.5281/zenodo.207999</a>
Responsiveness to intervention in children with dyslexia: A clinical approach
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208693.pdf (Publisher’s version ) (Open Access)Radboud University, 04 november 2019Promotores : Verhoeven, L.T.W., Segers, P.C.J.157 p
Rodelinghem (Pas-de-Calais). L'église
No full textSegers Bernard. Rodelinghem (Pas-de-Calais). L'église. In: Archéologie médiévale, tome 25, 1995. p. 259
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