43 research outputs found
Dorypetalum helenae Stoev & Enghoff, 2006, sp. n.
No full textDorypetalum helenae sp. n. Figs 2–14 Material examined Holotype: adult male; Turkey (European part), Edirne Province, Kuru Daġ Mts, SE Keşan, 350 m, Pinus / Quercus forest, 9.v. 1995, H. Enghoff, M. Frater, H. Read leg. (Zool. Mus. Copenh. Exp.) (Natural History Museum of Denmark — ZMUC) — Paratypes: 2 females, 1 juvenile, same locality, date and collectors as holotype (ZMUC). Etymology The species is named after the British myriapodologist Dr. Helen Read, a participant in the expedition to Turkey organized by the ZMUC, very likely the actual collector of the new species and author of several papers on millipede taxonomy. Description Length: adult male broken, exact length unknown, adult female: ca. 17 mm. Width of midbody pleurotergite (PT) of female paratype: 1.2 mm. Adults with 43 PTs; juvenile with 35 PTs. Body color (Fig. 2): generally browngrayyellowish; metazonites with dark, brownish, posterior band; prozonites greywhitish; dorsal crests usually darker, contrasting against a yellowish background; collum and next five PTs with medial dark band, forming something like an uninterrupted darker line extending from middle of collum to posterior end of PT 6 (Fig. 4); legs pale brownyellowish; antennae (excluding apical cones) and head dark brown. Front of head concave in males, convex in females, covered with slender, whitish setae: frontal margin brownish, sometimes with irregular lighter spots in the middle, labral zone yellowish, edge between the frontal and posterior side of head, stipes and cardo marbled yellowish — brown (Fig. 3). Ocellaria subtriangular, composed of 22 transparent ocelli arranged in 5 rows on a black background. Organs of Tömösváry larger than an ocellus, placed between anterior side of ocellar triangle and antennal pit, well separated from both. Antennae: moderately long, almost reaching the mid of PT 6 when folded backward; fifth antennomere with a posterior field of stout sensilla (Fig. 5); eight article comprised of 4 short, whitish cones. Male sixth and seventh PTs moderately enlarged, not as strongly as in some other callipodidans (e.g. Paracortina, Bollmania). Collum smooth, other anterior PTs with moderately developed almost flattened crests, crests getting more pronounced towards the body end. Four crests between the ozopores on seventh PT. Ozopores visible on all PTs from the 6 th backwards, except on the last two PTs, placed at the base of 3 rd crest. Chaetotaxy: Table 1. First and second legpairs markedly shorter, third slightly shorter than subsequent legs, all with tarsal claws, tarsi undivided, ventrally with a row of long setae instead of pads (Figs 6–8). Male legpairs 4–7 without tarsal claws, tarsi with a trace of division; pads poorly developed, concentrated on the posterior third (7 l. p.) or fourth (4– 6 l.p.) of tarsi. Prefemur of first male leg with a lateral outgrowth (j) on its posterior side (Fig. 6). Coxae of second leg pair with posterior gonopore (Fig. 7). Male third leg unmodified (Fig. 8). Prefemur of male 4 th leg heavily enlarged, with ventral outgrowth (h), coxa projected ventrally, its apical part pointed and curved cephalad (Fig. 9). Prefemur of male 5 th legpair moderately enlarged, subconcave ventrally (Fig. 10). Coxa of male 6 th leg dorsally expanded, femur incrassate (Fig. 11). Coxa of male 7 th leg with a long ventral protrusion (z), prefemur with a posterior thickening, femur slightly incrassate, tarsus elongated (Fig. 12). Coxal sacs present at least from 3 rd to 7 th leg pair, in subsequent legs either missing or not visible. Hypoproct tripartite, medial sclerite largest, trapezoidal, bearing two paramedian macrosetae. Paraprocts divided into larger ventral and smaller dorsal sclerites, each bearing a pair of macrosetae. Spinnerets thin and long, ending with a long macroseta. Anterior setae Posterior setae Collum a, d + a, d b, c, e + b, c, e 2 nd pleurotergite a, d, e a + a, d, e b, c + b, c 3 rd pleurotergite a, e + a, e b, c, d + b, c, d 4 th pleurotergite a + a b, c, d, e + b, c, d, e 5 th pleurotergite a + a b, c, d, e + b, c, d, e 6 th pleurotergite a, b, c, d, e + a, b, c, d, e 7 th pleurotergite a + a b, c, d, e, f + b, c, d, e, f 8 th pleurotergite a + a b, c, d, e, f + b, c, d, e, f a. Setae d and e are not in a truly anterior position, just about the mid distance between the anterior and posterior rows. The same holds true for seta e on the third PT. Male gonopods (Figs 13–14): telopodite (t) and prefemoral process (pf) as typical for the genus (see Hoffman & Lohmander (1964) for detailed description). Mesal coxal process (mp) long, erected, apically broadened, racketshaped, its apical part subdivided into a dorsal (d) and a ventral (v) lamina, t and pf ending close to them; tuft of long and stout setae (k) placed in a row at about midlength of the anterior side of mp; upper edge of larger lamina somewhat irregularly serrate, bearing a few tiny setae. Lateral coxal process (lp) S shaped, apically pointed, as high as 2 / 3 rd of the mesal coxal process, a small distal tooth (f) placed at about its midlength. The new species differs significantly from the other congeners in the shape of the mesal coxal process. Females: Second leg pair normal. All female legs with a tarsal claw. Remarks Regarding the shape of gonopods, D. helenae sp.n. is morphologically close to D. bulgaricum Strasser, 1973, both species being characterized by the cluster of spines lying directly on the anterior side of the mesal coxosternal process (see also the key below). However, it is well distinguished from the latter by the specific racketshape of the mesal process, and also by having the lateral process apically pointed, devoid of denticles. D. bulgaricum is unique among all congeners in having an extra pleurotergite, i.e. 44 vs. 43, but the significance of this character for species characterisation in Dorypetalidae is still uncertain. PLATE 1. Dorypetalum helenae sp. n., female paratype: Fig. 2: lateral view; Fig. 3: ventral view; Fig. 4: dorsal view. Being quite uniform with regard to the telopodite and prefemoral processes, the question whether the mesal and lateral processes of dorypetalid gonopods are of any importance to species distinction or their slightly different shape is due to an individual variation was brought up by Hoffman & Lohmander (1964). This issue was commented also by Strasser (1974) who stated “.... the question remains open whether we are dealing with different species or, as Hoffman suspects, with a single, geographically strongly variable species“ (our translation). We think that the new evidence at hand, and especially the quite unusual shape of the mesal process in D. helenae, show that these characters are of certain value and can be used for taxonomic purposes. Other taxonomically important characters for species’ separation can be observed in male pregonopodal legs. PLATE 2. Dorypetalum helenae sp. n., holotype: Fig. 5: antenna, lateral view; Figs 6–12: male legs 1–7, respectively, anterior views. Abbreviations, see text. Scale bar: 1 mm.Published as part of Stoev, Pavel & Enghoff, Henrik, 2006, A review of the millipede genus Dorypetalum Verhoeff, 1900 (Diplopoda: Callipodida: Dorypetalidae), pp. 29-43 in Zootaxa 1254 on pages 31-34, DOI: 10.5281/zenodo.17305
Angulifemur unidigitis Zhang 1997
No full textAngulifemur unidigitis Zhang, 1997 Angulifemur unidigitis Zhang, 1997, Thesis Compilation of Tianjin Natur. Hist. Mus., 14: 2, figs 2–15. Male HT (IZCAS) from Longbaopo Cave, Mengzi County, Yunnan, China. Paracortina (Altum) wangi Stoev, 2004, Zootaxa, 441: 2, figs 1–11. Male HT* (SOFM), Male PT (MNHN) from Wulichong Sinkhole Cave, Mengzi County, Yunnan, China. New synonym. Range: caves in Mengzi County, southern Yunnan, China. Remark: There is no doubt that A. unidigits Zhang, 1997 and Paracortina wangi Stoev, 2004 are conspecific. Both spe- cies were reported from the same cave system Long Bao Pao Dong – Wulichong Sinkhole situated in the karst plateau south of Mengzi. This obvious synonymy could have been avoided if the first author were aware of the paper of Zhang in the time of the description of P. w a n g i.Published as part of Stoev, Pavel, Sierwald, Petra & Billey, Amber, 2008, An annotated world catalogue of the millipede order Callipodida (Arthropoda: Diplopoda) *, pp. 1-50 in Zootaxa 1706 on page 17, DOI: 10.5281/zenodo.18090
PESI - a taxonomic backbone for Europe
No full textThis is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The attached file is the published version of the article.NHM Repositor
Estimating heavy-tail exponents through max self-similarity
No full textIn this paper, a novel approach to the problem of estimating the heavy-tail exponent α >; 0 of a distribution is proposed. It is based on the fact that block-maxima of size m scale at a rate m 1/α for independent, as well as for a number of dependent data. This scaling rate can be captured well by the max-spectrum plot of the data that leads to regression based estimators for α. Consistency and asymptotic normality of these estimators is established for independent data under mild conditions on the behavior of the tail of the distribution. The proposed estimators have an important computational advantage over existing methods; namely, they can be calculated and updated sequentially in an on-line fashion without having to store the entire data set. Practical issues on the automatic selection of tuning parameters for the estimators and corresponding confidence intervals are also addressed. Extensive numerical simulations show that the proposed method is competitive for both small and large sample sizes, robust to contaminants and continues to work under the presence of substantial amount of dependence. The proposed estimators are used to illustrate the close connection between long-range dependence and heavy tails over an Internet traffic trace.Manuscript received June 11, 2007; revised September 24, 2010; accepted September 24, 2010. Date of current version February 18, 2011. The work of S. A. Stoev and G. Michailidis was supported in part by NSF Grant DMS-0806094. The work of M. S. Taqqu was supported in part by NSF Grant DMS-0706786. (DMS-0806094 - NSF; DMS-0706786 - NSF)First author draf
Pseudo-random properties of a linear congruential generator investigated by b-adic diaphony
No full textEthmostigmus Pocock 1898
No full textGenus Ethmostigmus Pocock, 1898 Type-species. Scolopendra trigonopoda Leach, 1817 (by subsequent designation). Range. India: Tamil Nadu, Assam, Madras; W Nepal (Annapurna Reservation Area); Bhutan; Sri Lanka; China; Myanmar; Cambodia; Laos; Thailand; Vietnam; Singapore; Taiwan; Philippines; Peninsular Malaysia, Borneo Island (Sarawak); Indonesia: Java Island, Sulawesi Island, Maluku Islands, Raja Ampat Islands, West Papua; Papua New Guinea: Madang Province, Bismarck Archipelago; Australia: Northern Territory (Keep River National Park), Western Australia (McDermid Rock, Kimberley, Banjiwarn, Goldsworthy); Solomon Islands; Polynesia: Tahiti, Society Islands, Tuvalu Islands; Turkey (?); Africa: Algeria; Ethiopia; Sudan; Tanzania; Gambia (Bijilo Forest Park); Angola; Malawi; Congo; Zanzibar Archipelago; Fernando Po Island. Remarks. Ethmostigmus relictus was described by Chamberlin (1944b) from “«Luid[?]», Dutch New Guinea [West Papua Province]” on the basis of one specimen. According to the author the species is morphologically close to E. rubripes in the form of the “pseudopleural [=coxopleural] process” but differs from the latter “in having but two spines above [=dorsal] with these low and blunt, almost abortive. It differs also in lacking a tarsal spine [=spur] on the 20th pair of legs”. All these “differences” fall well within the intraspecific variability of E. r. rubripes, so this dubious form has not been included in the list of species. According to Bonato et al. (2016) E. relictus is known also from Java Island (Indonesia) but we were not able to find where this record comes from.Published as part of Schileyko, Arkady A. & Stoev, Pavel E., 2016, Scolopendromorpha of New Guinea and adjacent islands (Myriapoda, Chilopoda), pp. 247-280 in Zootaxa 4147 (3) on page 258, DOI: 10.11646/zootaxa.4147.3.3, http://zenodo.org/record/26484
Eigenmode Distortion Analysis for Motion Cueing Evaluation in Fixed-Wing Aircraft Simulators
No full textThe Eigenmode Distortion (EMD) analysis is a novel method for objective evaluation of simulator motion cueing fidelity, developed at Delft University of Technology. It expresses the distortions of the perceived motion cues in terms of the dynamic modes of a linear model of the vehicle and has been applied to assess rotorcraft simulations. This thesis presents the adaptation of EMD for fixed wing aircraft, including performing the analysis at the pilot station instead of the centre of gravity. The method is applied to a combined linear model of a Cessna Citation 500 aircraft and the Classical Washout Algorithm (CWA). EMD is compared to the current state-of-the-art objective method, the Objective Motion Cueing Test (OMCT), which does not consider the dynamics of the simulated vehicle in its analysis. The two methods show different results in their cueing fidelity assessment of four CWA configurations. An experiment with six pilots is performed in the SIMONA Research Simulator to test the capability of EMD and OMCT to predict the cueing fidelity as perceived by pilots. The subjects perform pairwise comparisons between the four CWA configurations by exciting the short period dynamics of the aircraft. Results indicate that preferences vary considerably between pilots, causing both EMD and OMCT to show poor, but similar, predictive capabilities.Aerospace Engineering | Control & Simulatio
Photoacoustic Imaging by Means of Sparsity Regularization
No full textThe intertwine of the optical and acoustic domains by the photoacoustic effect has given rise to the novel technique of photoacoustic imaging. As a relatively new field it faces many challenges from different character on the way to clinical applications. One of these challenges, which deteriorates image quality and sharpness, is noise. The usual answer to this undesired effect is averaging over multiple measurements. This has its cost however, prompting the search for other noise reduction methods. In this thesis, we assume our imaging domain to be sparse and apply sparsity regularization accordingly. By this, we attempt to reduce the noise artefacts and improve the overall signal-to-noise ratio. To accomplish this task, we first solve the photoacoustic wave equation in linear form and discretize the result to acquire a data model. Then, we construct an imaging procedure based on the adjoint operator. Finally, we apply the sparsity regularization procedure to both synthetic and experimental data. We report on improved signal-to-noise ratio and several interesting finds among which are the dependence of the regularization parameter on the noise power and a different optimality criterion for the parameter choice in photoacoustic imaging.Circuits and SystemsTelecommunicationsElectrical Engineering, Mathematics and Computer Scienc
Tachythereua hispanica Meinert 1886
No full textTachythereua hispanica (Meinert, 1886) Scutigera Hispanica Meinert, 1886 a: 105. Tachythereua maroccana Verhoeff, 1905 a: 12, 54, 56, figs 8–9 [type loc. Morocco: Tanger and Casablanca, two males, 16 females, one juvenile, syntypes, Nos 3866–3868, ZMB]. Tachythereua maroccana var. spinosa Ribaut, 1911: 419 [type loc. Morocco: BeniSnassen: Aïn Sfa, syntypes: two females, MNHN] New Synonym! Type locality: Spain: Sevilla. Lectotype: female (M. Würmli designated), No 13 / 689, ZMUC. Paralectotypes: two specimens (one female), ZMUC. Material examined: The MNHN houses specimens identified by H.W. Brolemann from Morocco (Kenitra), as well as the syntypes of T. marrocana var. spinosa from Aïn Sfa. New record: adult M & F, A. Oued Laouem, in front of Chaouem, 20.v. 1965, J.M. Betsch leg. General distribution: Morocco (Tanger; Casablanca; Aïn Sfa; Kenitra; Oued Ykem; Boulhaut; Haute Reraya, 1 250 m). Spain (Carratraca; Cordoba; Algeciras near Gibraltar; Carmona; Cinca de Pina; Sevilla). Unknown locality: A. Oued Laouem. Remarks: Meinert (1886 a) described Scutigera hispanica from Sevilla in Spain. Similarly to the fate of some other of his species (see also the remarks under T. microstoma), S. hispanica remained in complete oblivion for more than 115 years. Just recently, it appeared in the paper of Unsöld & Melzer (2003), but as Tachythereua hispanica, without further explanation for this taxonomic alteration. The monotypic genus Tachythereua includes only maroccana – the type specimens described by Verhoeff (1905 a) from Tanger and Casablanca in Morocco, and subsequently found in other regions of the country, as well as in southern Spain (Würmli, 1973). While studying the scutigeromorphs preserved in the ZMUC in NovemberDecember, 2001, the senior author (P.S.) examined the types of Scutigera hispanica Meinert, 1886 – 3 specimens: one adult female, lectotype, M. Würmli designated; and two paralectotypes (one female), labelled “ Scutigera hispanica Mein., Spanien spec. orig. 13 / 689 ” and second label “ Tachythereua hispanica (Meinert, 1886), M. Würmli det., 1974 ”. Undoubtedly, Marcus Würmli was the first to recognise the true identity of hispanica, although he never published his observations. Our reexamination of the lectotype also confirmed that hispanica is conspecific with Tachythereua maroccana, having priority over it by nineteen years. Perhaps Unsöld & Melzer (2003) found similar labels left by Würmli while studying the scutigeromorphs in the Zoologische Staatssammlung, München, in 1970 s. Tachythereua maroccana var. spinosa was distinguished from the type form solely on the presence of more tergal spines (Ribaut, 1911). This character alone could hardly justify the erection of a new variety or subspecies, that is why we propose the following new synonymy: Tachythereua hispanica (Meinert, 1886) = Tachythereua marrocana var. spinosa Ribaut, 1911 New Synonym.Published as part of Stoev, Pavel & Geoffroy, Jean-Jacques, 2004, An annotated catalogue of the scutigeromorph centipedes in the collection of the Muséum National d'Histoire Naturelle, Paris (France) (Chilopoda: Scutigeromorpha), pp. 1-12 in Zootaxa 635 on pages 4-5, DOI: 10.5281/zenodo.15801
