2,804 research outputs found
Bettelheim (C.) - L'Inde indépendante.
No full textLeduc Gaston. Bettelheim (C.) - L'Inde indépendante.. In: Revue économique, volume 16, n°4, 1965. pp. 665-666
Fig. 3. Trefusialaimus idrisi Leduc, 2013 in Halanonchus scintillatulus sp. nov. from New Zealand and a review of the suborder Trefusiina (Nematoda: Enoplida)
No full textFig. 3. Trefusialaimus idrisi Leduc, 2013, ♀ (NIWA139242). A. Anterior body region. B. Cephalic region. C. Posterior body region. D. Reproductive system. Scale bars: A = 50 μm; B = 20 μm; C = 90 μm; D = 125 μm.Published as part of Leduc, Daniel, Zhao, Zeng Qi & Sinniger, Frederic, 2020, Halanonchus scintillatulus sp. nov. from New Zealand and a review of the suborder Trefusiina (Nematoda: Enoplida), pp. 1-45 in European Journal of Taxonomy 661 on page 20, DOI: 10.5852/ejt.2020.661, http://zenodo.org/record/388884
Weststrats (C.) - Portrait of a modem mixed economy : New Zealand.
No full textLeduc Gaston. Weststrats (C.) - Portrait of a modem mixed economy : New Zealand.. In: Revue économique, volume 13, n°1, 1962. pp. 151-152
Trefusialaimus idrisi Leduc 2013, sp. nov.
No full text<i>Trefusialaimus idrisi</i> sp. nov. <p>Figs 3-4; Table 1</p> <p>urn:lsid:zoobank.org:act: 56BD1B40-542A-4FE2-BB84-F8FC7C5C2667</p> Diagnosis and relationships <p> <i>Trefusialaimus idrisi</i> sp. nov. is characterised by relatively short body length, presence of numerous golden inclusions in the chords, cephalic setae 0.65-0.80 cbd long, spicules 2.3 abd long, 4 pairs of pericloacal papillae, and long, gradually tapering tail.</p> <p> Until now, only two <i>Trefusialaimus</i> had been described, viz., <i>T. magnus</i> (Filipjev, 1946) and <i>T. monorchis</i> Riemann, 1974. <i>Trefusialaimus idrisi</i> sp. nov. is similar to <i>T. magnus</i> in the shape of the copulatory apparatus and tail, but can be differentiated from the latter by the shorter body length (4540 <i>vs.</i> 7700 <b>M</b> m), lower value of c (7 <i>vs.</i> 21), longer cephalic setae (0.65-0.80 <i>vs.</i> 0.4 cbd), longer spicules (2.3 <i>vs.</i> 1.7 abd), and longer tail (38 <i>vs.</i> 11 abd). <i>T. idrisi</i> sp. nov. can easily be differentiated from <i>T. monorchis</i> by the markedly longer cephalic setae (0.65-0.80 <i>vs.</i> 0.26 cbd), absence of pre- and post-cloacal papillae (present in <i>T. monorchis</i>), and tail shape (gradually tapering <i>vs.</i> conico-cylindrical).</p> Etymology <p>The species is named after Idris Matai Kljucanin Brun, the author’s godson.</p> Material examined <p> <b>Holotype</b></p> <p>♂, collected on 20 Feb. 2011 (NIWA cruise TAN1103, station 69), central Chatham Rise (43.331° S, 178.288° E), water depth 350 m, sediment depth 1-5 cm, mean grain size 55-59 µm, %sand 55-57%, particle sorting (geometric) 4.1-4.3 (NIWA 88349).</p> <p> <b>Paratype</b></p> <p>1 juvenile, same data as holotype (NIWA 88350).</p> Description <p> <b>Male</b></p> <p> Body cylindrical, slender, tapering slightly towards anterior extremity (Fig. 4D), with slight golden colouration due to the presence of numerous round, <i>ca.</i> 1 µm diameter, golden inclusions in the chords (i.e., longitudinal thickenings of the hypodermis protruding internally between the sectors of the longitudinal muscles; Chitwood & Chitwood 1974) (Fig. 4E). Cuticle smooth, thin, <i>ca.</i> 0.7-0.9 µm thick, except in head region (anterior to cephalic setae) where it is slightly thicker, 1.0- 1.6 µm. Head rounded, slightly set-off from body due to thickened cuticle, with three lips, each bearing two small, conical inner labial papillae 1.0- 1.5 µm long (Fig. 3B). Six outer labial setae and four cephalic setae in one circle, double-jointed; cephalic setae slightly longer than outer labial setae (0.75-0.80 cbd <i>vs.</i> 0.65 cbd). Sub-cephalic and somatic setae absent. Amphid pocket-shaped with oval aperture, <i>ca.</i> 6 µm wide by 2 µm high (Fig. 3A). Buccal cavity funnel-shaped, without teeth. Pharynx cylindrical, slightly swollen at posterior extremity, completely surrounds buccal cavity. Pharyngeal lumen lightly but distinctly cuticularised at anterior extremity (Figs 3B, 4B). Nerve ring situated at <i>ca.</i> 50% of pharynx length. Secretory-excretory system not observed. Cardia small.</p> <p> Reproductive system monorchic with single outstretched testis, <i>ca.</i> 1960 µm long. Position of testis relative to intestine difficult to ascertain. Elongated sperm cells, ca 3-5 µm wide by 13-16 µm long, with central rod and nucleus at one extremity (Fig. 3G); vas deferens <i>ca.</i> 520 µm long, without muscular ejaculatory duct. Paired, equal spicules, 2.3 abd long, slightly bent near distal one third, with broad proximal end and narrow pointed distal end; velum present (Fig. 3D). Gubernaculum with two pairs of narrow, pointed lateral crurae (Fig. 3E). Four pairs of small, conical peri-cloacal papillae (Fig. 3F). Precloacal supplements absent. Tail long, <i>ca.</i> 14% of total body length, narrow, gradually tapering, without setae (Fig. 3H).</p> <p> <b>Juvenile</b></p> <p> Similar to male, but with shorter and narrower body, shorter cephalic setae (Figs 3C, 4B), and smaller amphid. Numerous sperm cells are present throughout the pseudocoelom from <i>ca.</i> 90 µm posterior to pharynx to <i>ca.</i> 200 µm anterior to anus (Fig. 4C). Genital and copulatory (i.e., cloacal or vulval) primordia not observed.</p> Discussion <p> The presence of sperm cells in the pseudocoelom of the juvenile <i>Trefusialaimus idrisi</i> sp. nov. specimen is unusual. Some nematode species, such as <i>Oncholaimus oxyuris</i>, can transfer sperm through traumatic insemination (Coomans <i>et al</i>. 1988), a process whereby the male injects sperm directly into the body of a female (or potentially even a male or juvenile) by piercing the cuticle with the spicules. The presence of sperm cells in the juvenile specimen could be explained if a similar process occured in <i>T. idrisi</i> sp. nov. The existence of such a reproductive strategy, however, is highly conjectural because no <i>Trefusialaimus</i> females have ever been observed and (to my knowledge) traumatic insemination has not been described in the suborder Trefusiina.</p> <p> <i>Trefusialaimus idrisi</i> sp. nov. was rare at the study site, with only four specimens (the two type specimens and two juveniles in poor condition, each from a different subcore) recorded out of the 4412 individuals that were identified by Leduc & Pilditch (2013). All individuals were found in the surface (0-1 cm) sediment layer (D. Leduc, unpublished data). A single juvenile specimen (out of 4550 specimens identified from 30 locations on the New Zealand continental margin) was recorded from a site on the northern flank of Chatham Rise at a depth of 1000 m (178.500° E, 44.333° S; silt/clay content 95%) (Leduc <i>et al</i>. 2012a; D. Leduc unpublished data).</p>Published as part of <i>Leduc, Daniel, 2013, Two new free-living nematode species (Trefusiina: Trefusiidae) from the Chatham Rise crest, Southwest Pacific Ocean, pp. 1-13 in European Journal of Taxonomy 55</i> on pages 8-12, DOI: 10.5852/ejt.2013.55, <a href="http://zenodo.org/record/3822945">http://zenodo.org/record/3822945</a>
Figure 4. Trefusialaimus idrisi Leduc, 2013 in Halanonchus scintillatulus sp. nov. from New Zealand and a review of the suborder Trefusiina (Nematoda: Enoplida)
No full textFigure 4. Trefusialaimus idrisi Leduc, 2013, ♀ (NIWA139242), light micrographs. A. Optical crosssection of cephalic region showing buccal cavity, lips and pharynx. B. Surface view of cephalic region showing outer labial setae and amphid. C. Mid-body region showing intestine and sperm cells in pseudocoelom (arrows). Scale bars: A–B = 15 μm; C = 22 μm.Published as part of Leduc, Daniel, Zhao, Zeng Qi & Sinniger, Frederic, 2020, Halanonchus scintillatulus sp. nov. from New Zealand and a review of the suborder Trefusiina (Nematoda: Enoplida), pp. 1-45 in European Journal of Taxonomy 661 on page 21, DOI: 10.5852/ejt.2020.661, http://zenodo.org/record/388884
Une nouvelle synthèse : C. Mossé, La femme dans la grèce antique.
No full textLeduc Claudine. Une nouvelle synthèse : C. Mossé, La femme dans la grèce antique.. In: Dialogues d'histoire ancienne, vol. 10, 1984. pp. 447-448
Bruno Groppo et C. Riccamboni , La Gauche et «56» en Italie et en France, 1987
No full textLeduc Victor. Bruno Groppo et C. Riccamboni , La Gauche et «56» en Italie et en France, 1987. In: Raison présente, n°87, 3e trimestre 1988. Actualité du rationalisme. pp. 163-164
Mudwigglus Leduc 2013
No full textKey to species of Mudwigglus Leduc, 2013 See Table 2 for additional diagnostic characters. 1. Gubernaculum apophysis absent...................................................................................................... 2 – Gubernaculum apophysis present..................................................................................................... 3 2. Amphid length/width ratio 3.5; spicules 23–25 µm long.............. M. macramphidium Leduc, 2013 – Amphid length/width ratio 2.2; spicules 15 µm long............................ M. micramphidium sp. nov. 3. Tail conoid with clavate tip; c’-ratio> 3........................................................................................... 4 – Tail cylindrical with bluntly rounded tip; c’-ratio <3...................................................................... 5 4. Males with one precloacal setae and two tubular supplements.................. M. plebeius Leduc, 2013 – Males with one or two precloacal setae, tubular supplements absent............................................................................................................................................... M. minutus (Vitiello, 1972) comb. nov. 5. Body longer than 0.7 mm; spicules 31–37 µm; vagina oblique.............. M. patumuka Leduc, 2013 – Body shorter than 0.4 mm; spicules 16–23 µm; vagina perpendicular.............................................................................................................................................. M. nellyae (Vincx & Gourbault, 1992)Published as part of Holovachov, Oleksandr, 2017, Belgopeltula belgica (Vincx & Gourbault, 1992) gen. et comb. nov. and Mudwigglus micramphidium sp. nov. from the west coast of Sweden, and reappraisal of the genus Pseudaraeolaimus Chitwood, 1951 (Nematoda: Araeolaimida: Diplopeltidae), pp. 1-21 in European Journal of Taxonomy 383 on page 12, DOI: 10.5852/ejt.2017.383, http://zenodo.org/record/383980
Cervonema kaikouraensis Leduc 2012, sp. nov.
No full textCervonema kaikouraensis sp. nov. urn:lsid:zoobank.org:act: 00FCA18B-AB7B-4464-8DBC-A75F17F3BC72 Figs 2-4, Table 1 Etymology This species is named after the type locality. Material examined Holotype Ƌ, collected 5 May 2010, Kaikoura Canyon axis (1061 m water depth), 42.5081°S, 173.6325°E (NIC 84440). Paratypes 2 ♀♀, same data as holotype (NIC 84441). Description Males Body cylindrical, tapering towards both extremities. Cuticle faintly striated, no lateral differentiation. Somatic setae very short and sparse, 1-2 μm long, except in pre-cloacal region, 4 μm long. Head not setoff by constriction. Six inner labial papillae, six jointed outer labial setae, and four cephalic setae, not jointed. Amphideal fovea spiral, 5.5 turns, at 1.7 head diameters from anterior. Golden-coloured granular material in lateral, ventral, and dorsal chords, forming two continuous bands (Fig. 4D). Small buccal cavity, cup-shaped. Pharynx gradually widening posteriorly into an elongated bulb. Dorsal pharyngeal gland nucleus conspicuous. Cardia short. Nerve ring near middle of pharynx length. Secretory-excretory pore situated just posteriorly to nerve ring. Cellular body of ventral gland small, at level of cardia. Intestine wall with numerous granules, orange-brown in anterior portion, colourless in posterior portion. Reproductive system diorchic, opposed, outstretched.Anterior testis to left of intestine, posterior testis to right of intestine. Anterior testis with relatively large elongated sperm cells (up to 5 μm wide and 20 μm long), without nuclei (Fig. 2C). Posterior testis with smaller, globular sperm cells (4-6 μm diameter) with lenticular nuclei situated peripherally (Fig. 2D). Spicules paired, equal, narrow, straight, 0.9 abd long, with small capitulum. Rectal gland present. Five, possibly six tubular pre-cloacal supplements, difficult to observe, one pre-cloacal seta. Tail conico-cylindrical, with several caudal setae, 2-5 μm long, and three short terminal setae. Three caudal glands and well-developed spinneret (Fig. 4C). Females Similar to males, but with slightly larger maximum body diameter, amphideal fovea smaller, 4.5 turns. Reproductive system didelphic, opposed, with anterior branch to left of intestine and posterior branch to right of intestine. Terminal (i.e., distal) portion of anterior ovary bent in one paratype specimen (Fig. 4A), but not other paratype specimen; germinal portion of posterior ovary bent in both paratypes. Both types of sperm observed in uterus and spermathecae. Vulva at body median. Granular vaginal glands present, pars proximalis vaginae surrounded by constrictor muscle. Diagnosis and relationships Cervonema kaikouraensis sp. nov. is characterised by body length 1636 μm, amphid with 5.5 turns situated 1.7 head diameter from anterior end, jointed outer labial setae, equal in length to cephalic setae, anterior testis with large elongated sperm cells without nuclei, posterior testis with smaller nucleated sperm cells, 5 small pre-cloacal supplements, straight spicules 32 μm in length, and tail 5.5 abd. C. kaikouraensis sp. nov. can be differentiated from all other species of the genus, except C. allometricum Wieser, 1954 and C. pseudodeltensis Barnes et al., 2012 by the presence of jointed outer labial setae. The presence of jointed outer labial setae in C. allometricum was not described in the original description of Wieser (1954) but was later noted by Lorenzen (1981). C. kaikouraensis sp. nov. can be distinguished from C. allometricum and C. pseudodeltensis by the absence of gubernaculum and gubernacular apophyses (gubernaculum with conspicuous posterior apophyses present in C. allometricum and C. pseudodeltensis). The presence of jointed outer labial setae may have been overlooked in previous descriptions and may not be a reliable trait to use for differentiating between all species of Cervonema. C. kaikouraensis sp. nov. can further be differentiated from most other species of the genus (except C. deltensis Hope & Zhang, 1995 and C. papillatum Jensen, 1988 by the presence of sperm dimorphism. C. kaikouraensis sp. nov. differs from C. deltensis in body length (1636 vs. 1201 - 1237), length of cephalic setae (6 vs. 3-5 μm), amphideal fovea turns (5.5 vs. 3-5), position of amphid (1.7 vs. 1.4 hd from anterior), and absence of gubernaculum (plate-like gubernaculum in C. deltensis). C. kaikouraensis sp. nov. differs from C. papillatum in body length (1636 vs. 1140 - 1230), and by the absence of a weakly cuticularised cap surrounding the spicules proximally. The presence or absence of sperm dimorphism was not noted in the descriptions of C. brevicauda Gourbault, 1980 and C. jenseni Gourbault, 1980, but these species differ most notably from C. kaikouraensis sp. nov. in the presence of a gubernaculum (absent in C. kaikouraensis sp. nov.). C. brevicauda also has a shorter body length (800- 1090 vs. 1636), shorter cephalic setae (3 vs. 6 μm), and shorter spicules (0.6 vs. 0.9 abd) than C. kaikouraensis sp. nov. C. jenseni can also be differentiated from C. kakouraensis sp. nov. by the greater number of amphid turns (7 vs. 5.5) and absence of supplements (5 in C. kaikouraensis sp. nov.). Remarks The presence of bent ovaries, as observed in C. kaikouraensis sp. nov., is unusual for the family Comesomatidae. The ovaries, however, are bent only in the terminal portion. Because the ovaries in both female specimens are quite large and occupy most of the available space in the pseudocoel (Fig. 3D), this trait is considered to be a secondary feature resulting from lack of space, rather than true reflexed ovaries.Published as part of Leduc, Daniel, 2012, Deep-sea nematodes (Comesomatidae) from the Southwest Pacific Ocean: five new species and three new species records, pp. 1-42 in European Journal of Taxonomy 24 on pages 7-10, DOI: 10.5852/ejt.2012.24, http://zenodo.org/record/385834
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