323,719 research outputs found
Bleijenberg, Mathys Jacob, [No Service Number]
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/372237Surname: BLEIJENBERG
Given Name(s) or Initials: MATHYS JACOB
Military Service Number or Last Known Location: No Service Number
Missing, Wounded and Prisoner of War Enquiry Card Index Number: 55387183157
Item: [2016.0049.04564] "Bleijenberg, Mathys Jacob, [No Service Number]
Sechelleptus variabilis VandenSpiegel & Golovatch 2007
No full textSechelleptus variabilis VandenSpiegel & Golovatch, 2007 Fig. 2 Material examined Holotype UNION OF THE COMOROS • ♂; Mohéli, Fomboni; 12°15′ S, 043°45′ E; 21 May 2003; dead wood; R. Jocqué and D. VandenSpiegel leg.; BE_RMCA_MYR.Dip.21733. New material FRANCE – Department of Mayotte (Comoros archipelago) • ♂; Mereni, back of mangrove; 19 Nov. 2019; hand collecting; D. VandenSpiegel and A. Mathys leg.; BE_RMCA_MYR.Dip.22878 • 1 ♂, 1 ♀; same collection data as for preceding; 21 Nov. 2019; BE_RMCA_MYR.Dip.22879 • 1 ♂; same collection data as for preceding; BE_RMCA_MYR.Dip.22983 • 1 ♂, 1 ♀; Mont Benara; 12°52′ S, 045°09′ E; 21 Nov. 2019; hand collecting & sieving, litter; D. VandenSpiegel and A. Mathys leg.; BE_ RMCA_MYR.Dip.22883 • 1 ♂; Mont Combani, 500 m before Lodge; 12°47′ S, 045°09′ E; 15 Nov. 2019; sieving; litter; D. VandenSpiegel and A. Mathys leg.; BE_RMCA_MYR.Dip.22930. Remarks In the original description of the species, the length unit given for the specimens’ sizes is wrong and should have been cm instead of mm. Correct measurements are: length ♂♂: 3.4–8.0 cm; ♀♀: 5.0– 7.0 cm; midbody width 0.34–0.5 cm and 0.3 – 0.5 cm, respectively. Taking this modification into account, the recently collected specimens agree with the description (VandenSpiegel & Golovatch 2007).Published as part of Vandenspiegel, Didier, Henrard, Arnaud & Mathys, Aurore, 2021, Sechelleptus arborivagus sp. nov., a new arboreal spirostreptid millipede (Diplopoda, Spirostreptidae) endemic to Mayotte Island (Comoros Archipelago), Indian Ocean, pp. 1-21 in European Journal of Taxonomy 755 (1) on pages 7-8, DOI: 10.5852/ejt.2021.755.1395, http://zenodo.org/record/496600
Sechelleptus arborivagus Vandenspiegel & Henrard & Mathys 2021, sp. nov.
No full text<i>Sechelleptus arborivagus</i> sp. nov. <p>urn:lsid:zoobank.org:act: 0F7B3368-17F8-4CAD-8B11-C34B564FE8DE</p> <p>Figs 3–8</p> Diagnosis <p> A medium-sized arboreal millipede with relatively long legs, particularly similar to <i>S. variabilis</i> by sharing the structure of the male first leg and rather simple gonopods with the metaplica widened and a little higher than proplica, the latter without lateral cone. The two species differ by the gonotelopodite being apically divided in two branches in <i>S. arborivagus</i> sp. nov. and simple in <i>S. variabilis.</i></p> Etymology <p>Referring to the ecology of the species, which has always been observed climbing trees.</p> Material examined <p> <b>Holotype</b></p> <p> FRANCE – <b>Department of Mayotte</b> (Comoros archipelago) • ♂; Mt. Tchaourembo; 12°52′14″ S, 045°08′44″ E; 540–550 m a.s.l.; 25 Nov. 2019; D. VandenSpiegel and A. Mathys leg.; on tree; by hand; GenBank accession numbers: MW168813 (COI), MW148622 (16S rRNA); BE_RMCA_MYR. Dip.22874.</p> <p> <b>Paratypes</b></p> <p> FRANCE – <b>Department of Mayotte</b> (Comoros archipelago) • 1 ♂, 1 ♀; same collection data as for holotype; GenBank accession numbers: MW168814 (COI), MW148623 (16S rRNA); BE_RMCA_ MYR.Dip.22875 • 9 ♀♀; same collection data as for holotype; GenBank accession numbers: MW168815 (COI), MW148624 (16S rRNA); BE_RMCA_MYR.Dip.22876.</p> Additional material <p> FRANCE – <b>Department of Mayotte</b> (Comoros archipelago) • 1 ♀; Mt. Benara; 12°52′ S, 045°11′ E; 23 Jan. 1999; R. Jocqué and G. De Smet leg.; forest; by hand; GenBank accession numbers: MW148621 (16S rRNA); BE_RMCA_MYR.Dip.17917.</p> Description <p> <b>Holotype</b></p> <p>With 57 body rings (plus telson, no apodous rings); ca 100 mm long, 7 mm wide.</p> <p>LIVE COLORATION (Fig. 3). Head, collum, antennae, telson, anal valves and legs uniformly light brownish to dark brownish. Metazonae light brown to red-brown. Posterior margin of metazonites dark brown.</p> <p>HEAD. Smooth. Each eye patch with circa 60 ommatidia arranged in seven horizontal rows (Fig. 4A), Labrum with three smoothly rounded teeth and a single row of 21 short labral setae (Fig. 4G). Clypeus with four supra-labral setae, two on each side (Fig. 4G). Antennae moderately long (Fig. 3), protruding back to ring 2. Relative length of antennomeres: 1>2>3=4=5>6. Terminal antennomere (disc) with four large sensory cones located together inside a membranous area. Each of antennomeres 5 and 6 apicolaterally with a field of narrow and long sensilla basiconica (Fig. 4B). Gnathochilarium, usual for spirostreptideans (Fig. 4D). Prementum (pm) smooth and straight, not depressed. Mentum (me) smooth. Lamellae linguales each with two strong apical setae, one equally strong seta behind these, plus, basally, an oblique line of four setae. Stipites with a basal longitudinal field of setae, lateral margin in distal half with a row of setae; one isolated, subapical, stout seta or sensillum; cardo small, kidney-shaped. Mandibles (Fig. 4E, F) with stipes devoid of differentiation. Odontomere (od) long, moveable. Sectile edge (se) of psectromere (ps) with four lobes; eight pectinate lamellae (pl). One wide molar furrow (mf).</p> <p>COLLUM. Smooth, ventrally with six longitudinal furrows, anteroventral angle 80–90°.</p> <p>BODY RINGS. Prozonae smooth. Metazonae with longitudinal striae ventrally from ca ⅔ ring length below ozopore. Ozopores located on metazonae, starting with ring 6, located close to, but not touching the suture between pro- and metazonae. Limbus simple (Fig. 4H). Defensive glands well-developed (Fig. 4I).</p> <p>TELSON. Preanal ring with a shallow submarginal depression. Anal valves smooth, without submarginal depression. Hypoproct, small, widely triangular.</p> <p>LEGS. Length 0.45–0.5 × body diameter, postfemoral and tibial pads (Fig. 4J) from third male leg-pair until beyond midbody, pads decreasing in size posteriorly; claw large, curved (Fig. 4K). First pair of male legs with a well-developed prefemoral process ending in an inward curved tip (Fig. 5A). Coxosternum with a laterobasal field of four strong setae on anterior side.</p> <p>GONOPODS (Figs 5B–E, 6). Sternum (st) triangular, not reaching as far distad as paracoxite (px). Metaplica (mp) higher than proplica, rounded apically (Fig. 5C; mp). Proplica with straight sides, in apical part with scattered short setae, ending apically in a more or less spiniform mesapical projection (Fig. 5C; mpp) and a well-developed, apicolateral, lamellose lobe (Fig. 6C; al); telopodite (Fig. 5B, E; tlp) long and slender, without a distinct demarcation between femoral and postfemoral parts, femorite with a small and pointed antetorsal process (Fig. 5E; ats), postfemorite spiralled, ribbon-shaped, broad and long, with a divided tip, the longer branch carrying the terminal opening of the solenomere (Fig. 5B; sl).</p> <p> <b>Paratypes</b></p> <p>Male similar to holotype.</p> <p>Female coloration as in male, but generally larger in size than male (up to 120 mm long 9 mm wide (58–61 body rings plus telson, no apodous rings). Vulvae located in membranous pouches attached to coxae 2 and 3 and to the inner lateral margin of ring 1, simple, consisting of two simple, subequallysized, moderately sclerotized valves, the aboral valve with an apical cluster of setae; ridge between valves covered with a lateral longitudinal operculum (Fig. 7).</p> Distribution <p>The species seems endemic to Mayotte (Fig. 8).</p> Affinities <p> On the basis of the gonopod structure having the telopodite with a spine arising well distad of the knee, a ribbon-shaped distal part, and a small free solenomerite arising just near the apex, the new species is manifestly a new member of the large genus <i>Sechelleptus</i>. Following the key published by Jeekel in 1999, <i>arborivagus</i> keys out close to <i>sulcicollis</i> and <i>macilentus</i>. Indeed the three species have a rather simple gonocoxite with a distally widened metaplica without a strong lateral cone but the new species do not show the small lateral uncus present on the metaplica of <i>sulcicolis</i> and possess a more or less spiniform mesapical projection on the proplica which is not present in <i>sulcicolis</i> neither in <i>macilentus</i>. By the overall shape of the male first leg and gonocoxite, the new species seems to be especially close to <i>S. variabilis</i>, also from the Comoros, but it differs strikingly by the structure of the gonotelopodite (in <i>S. variabilis</i> the gonotelopodite has a simple and pointed tip carrying the terminal opening of the seminal groove whereas in the new species the gonotelopodite has a divided tip, the longer branch carrying the terminal opening of the seminal groove) as well as by the larger body size and the longer and curved claws (Fig. 4K vs Fig. 2C). Other important differences concern the defensives glands, large in <i>S. arborivagus</i> sp. nov. (Fig. 4I) (vs inconspicuous in <i>S. variabilis</i> (Fig. 2A)), and the size of eyes: in the new specie the eyes are larger and include 60 ± 5 ommatidia (n = 10) arranged in 12 rows; whereas in <i>S. variabilis</i> the eyes, smaller, include 34 ± 3 (n = 10) ommatidia arranged in 9 rows.</p> Natural history <p> Most of the specimens belonging to the new species were collected on Mt Tchaourembo (see Fig. 8) in a forest fragment at 500–550 m a.s.l. All specimens were seen in trees and never in pairs, the males being rare (sex ratio> <b>1/6</b>). The species possesses enlarged ommatidia, relatively long legs with strongly curved tarsal claws, as well as a tendency for specimens to secrete extremely copiously from their defensive glands when irritated. Such modifications are considered by several authors as an adaptation to tree climbing and to arboreal life (Enghoff & Enghoff 1976; Hoffman & Howell 1983; VandenSpiegel 2001).</p> Discussion <p> Millipede systematics is mainly based on male gonopods because they use to be species-specific (Bond <i>et al</i>. 2003). However, studies based on DNA have demonstrated that molecular divergence in different millipede groups may not reflect divergence in morphology-based identifications and may hide considerable variation (Bond & Sierwald 2002; Bond <i>et al</i>. 2003; Adams <i>et al</i>. 2009; Mwabvu <i>et al</i>. 2013, 2015; Tinago <i>et al</i>. 2017). Although our relatively small taxon sampling, the phylogenetic analysis strongly recovers <i>Sechelleptus</i> as monophyletic and discriminates at least two or three different groups. Furthermore, the mean inter-specific distance values (14.9% for COI and 5.1% for 16S) were remarkably similar to previous studies that reported the presence of high genetic divergence among population of different spirostreptid species (Mwabvu <i>et al</i>. 2013, 2015), suggesting the existence of more than one species in those taxa. It is argued that high level of divergence between identified spirostreptid species may indicate that changes in genital morphology occur rather slowly relative to the high rate of substitution in mitochondrial sequences (especially for COI), and may underestimate species diversity. This also appears to be the case among the different forms of Mayottan <i>Sechelleptus</i>, which also share strongly similar gonopods. At the first glance, the new species of <i>Sechelleptus</i> seems to be a giant form of <i>S. variabilis.</i> However, although only subtle morphological differences are observed within the gonopods, the comparatively large body size and the behavior of <i>S. arborivagus</i> sp. nov. are remarkable. These observations finally corroborate our molecular analyses that clearly show sufficient genetic difference between the different <i>Sechelleptus</i> species collected on Mayotte (22.6% for COI and 6.6% for 16S between <i>S. arborivagus</i> sp. nov. and <i>S. variabilis</i>).</p> <p> The genetic analyses also suggest the presence of another different species, i.e., DU1, although its phylogenetic position remains unresolved. This unique specimen found at Mont Combani is a sub-adult female that could not allow a formal identification, but, judging from its general appearance, appears to be an intermediate from between the two <i>Sechelleptus</i> species collected on Mayotte. The genetic divergences, along with adaptations to arboreal life observed in the novel species, may indicate an “adaptive micro-radiation” on Mayotte Island or even the Comoros. However, the inclusion of more specimens, including adult males, in phylogenetic analyses is needed to test this hypothesis and evaluate the status of that putative new species.</p>Published as part of <i>Vandenspiegel, Didier, Henrard, Arnaud & Mathys, Aurore, 2021, Sechelleptus arborivagus sp. nov., a new arboreal spirostreptid millipede (Diplopoda, Spirostreptidae) endemic to Mayotte Island (Comoros Archipelago), Indian Ocean, pp. 1-21 in European Journal of Taxonomy 755 (1)</i> on pages 8-16, DOI: 10.5852/ejt.2021.755.1395, <a href="http://zenodo.org/record/4966001">http://zenodo.org/record/4966001</a>
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
R.A. Stucky, unter Mitarbeit von S. Stucky und mit Beiträgen von A. Loprieno, H.-P. Mathys und R. Wachter, Das Eschmun-Heiligtum von Sidon : Architektur und Inschriften, Antike Kunst Beiheft 19, Vereinigung der Freunde antiker Kunst, Bâle (2005)
No full textYon Jean-Baptiste. R.A. Stucky, unter Mitarbeit von S. Stucky und mit Beiträgen von A. Loprieno, H.-P. Mathys und R. Wachter, Das Eschmun-Heiligtum von Sidon : Architektur und Inschriften, Antike Kunst Beiheft 19, Vereinigung der Freunde antiker Kunst, Bâle (2005). In: Topoi, volume 16/2, 2009. pp. 589-598
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Cortical Coupling Reflects Bayesian Belief Updating in the Deployment of Spatial Attention
No full textThe deployment of visuospatial attention and the programming of saccades are governed by the inferred likelihood of events. In the present study, we combined computational modeling of psychophysical data with fMRI to characterize the computational and neural mechanisms underlying this flexible attentional control. Sixteen healthy human subjects performed a modified version of Posner's location-cueing paradigm in which the percentage of cue validity varied in time and the targets required saccadic responses. Trialwise estimates of the certainty (precision) of the prediction that the target would appear at the cued location were derived from a hierarchical Bayesian model fitted to individual trialwise saccadic response speeds. Trial-specific model parameters then entered analyses of fMRI data as parametric regressors. Moreover, dynamic causal modeling (DCM) was performed to identify the most likely functional architecture of the attentional reorienting network and its modulation by (Bayes-optimal) precision-dependent attention. While the frontal eye fields (FEFs), intraparietal sulcus, and temporoparietal junction (TPJ) of both hemispheres showed higher activity on invalid relative to valid trials, reorienting responses in right FEF, TPJ, and the putamen were significantly modulated by precision-dependent attention. Our DCM results suggested that the precision of predictability underlies the attentional modulation of the coupling of TPJ with FEF and the putamen. Our results shed new light on the computational architecture and neuronal network dynamics underlying the context-sensitive deployment of visuospatial attention.
SIGNIFICANCE STATEMENT:
Spatial attention and its neural correlates in the human brain have been studied extensively with the help of fMRI and cueing paradigms in which the location of targets is pre-cued on a trial-by-trial basis. One aspect that has so far been neglected concerns the question of how the brain forms attentional expectancies when no a priori probability information is available but needs to be inferred from observations. This study elucidates the computational and neural mechanisms under which probabilistic inference governs attentional deployment. Our results show that Bayesian belief updating explains changes in cortical connectivity; in that directional influences from the temporoparietal junction on the frontal eye fields and the putamen were modulated by (Bayes-optimal) updates
- …
