Van Hasselt Research Articles

Canons and Networks. 19th-Century Danish Art in Paris

Collections of Danish Golden-Age art are quite rare outside of Scandinavia, especially when it comes to those developed in accordance with a well-thought-out strategy established through the international cooperation of scholars. An important exception is the large group of Danish drawings, oil sketches, and artists’ correspondence found in the Fondation Custodia – Collection Frits Lugt in Paris, gathered by art historian and longtime museum director Carlos van Hasselt (1929–2009). As director, van Hasselt provided an interesting model of collecting, as his pursuit was not motivated by a particular investment strategy. His collection may, in a sense, be viewed as the material result of a network, one which he established and which brought together Danish researchers and museologists, as well as international art dealers. The aim of this article is therefore to investigate how a network may inform and help determine a particular collection practice, to trace how van Hasselt became an agent of the Danish art establishment, and to provide a critical overview of this collection, which became a satellite representation of the canon of 19th-century Danish art in Paris. Analysis of Carlos van Hasselt’s archive will provide critical reflections on the ways in which the collection was built and developed, and how it may serve as an example of the international dissemination of canons.

Almost half of the Gymnura van Hasselt, 1823 species are unknown: Phylogeographic inference as scissors for cutting the hidden Gordian knot and clarify their conservation status

AbstractGymnurid rays are found in tropical, subtropical, and temperate regions around the world, where they are associated with sandy or muddy bottoms in coastal areas, being easily distinguished from other rays by the width of the disc. In recent years, the systematics of this family have been revised extensively. However, there has been no comprehensive molecular review of the family based on an adequate sample of species and localities, which may have obscured the presence of distinct evolutionary lineages. The present study was based on samples of 12 of the 13 valid species of the genus Gymnura, which were used for a multilocus reconstruction of the evolutionary history of the family Gymnuridae. Our results indicate the existence of several cryptic gymnurid lineages, within the species Gymnura micrura, Gymnura lessae, Gymnura altavela, and Gymnura poecilura. Also, we indicate that only half of the species that compose the genus are known, as well their conservation status. The analyses also indicate that the gymnurids originated during the Paleocene, with events of dispersal and vicariance occurring through the formation of oceanographic barriers, and species diversification peaking during the Oligocene and Miocene. The results of the present study reinforce the need for a comprehensive revision of the systematics of the family, in particular, the widely distributed species that are considered valid taxa, but may, in fact, represent different cryptic species. The inadequate classification of this cryptic diversity may have negative implications for the development of effective conservation measures.

Reproduction in Sepia aculeata Van Hasselt, 1835 along the Andhra Pradesh coast, off the western Bay of Bengal

Sepia aculeata Van Hasselt, 1835 is a commercially important cuttlefish in Indian seaswith limited studies on its biology from the Indo-Pacific region. This study, observed thereproductive biology of S. aculeata from samples landed by the trawl fishery operating offthe coast of north Andhra Pradesh, off the western Bay of Bengal. A total of 3511 sampleswere studied, of which 2241 were females having dorsal mantle length (DML) ranging from8.7 to 21.4 cm and weight from 78 to 901 g and 1260 were male specimens of DML rangingfrom 7.9 to 21.9 cm and weight from 54 to 738 g. Females dominated the landings with a sexratio of 1.78. The length at first maturity was estimated at 14.3 and 12.6 cm DML for femalesand males, respectively. Both sexes spawned throughout the year with two significant peaksfrom July to October and from December to February with minor intermittent peaks. Theabsolute fecundity ranged from 330±1.44 x 102 eggs, with a relative fecundity of 75±8.94 x102 eggs 100 g-1 body weight. The results of this study may be used as inputs in assessingthe stock of S. aculeata in the study region. Keywords:Cephalopods, Needle cuttlefish, Size at firstmaturity, Spawning season, Trawl fisheries

Description of Stolephorus horizon n. sp. from Fiji and Tonga, and redescription of Stolephorus scitulus (Fowler, 1911) (Teleostei: Clupeiformes: Engraulidae)

The new anchovy Stolephorus horizon n. sp., described on the basis of 34 specimens collected from Fiji and Tonga, has been previously confused with Stolephorus indicus (van Hasselt, 1823) or Stolephorus scitulus (Fowler, 1911). However, the new species differs from both of the latter in having the pectoral fin without melanophores, and a unique range of gill rakers. A redescription of S. scitulus and an identification key of species previously identified as S. indicus are also provided.

Pristine and Fullerene between Hasselmann and Van Hasselt

It was about K3C60 organic superconductors related to a region found in Belgie at least funding & cash case denoted in mathematics dealt with economical realms, instead of econophysics. We also dealt with fusion also discussed in pure mathematics of tensor & Connes fusion as well as µ-catalyzed fusion. Accompany the ‘the most economical covering of space by sphere’ [the so-called “thinnest covering”] and thus they mainly arrange in a superlattice, - due to the thick organic shell, the orientational ordering of nanocrystals within this type of superlattice is low, therefore this type of crystal is not a monocrystal.

Relationships of growth increments of internal shells and age through entire life cycles in three cultured neritic cephalopods (Mollusca: Cephalopoda) with re-evaluation as application for age determination

Relationships between growth increments of internal shell and age was studied in three neritic decapod cephalopods cultured in laboratory through their entire life cycles. The studied cephalopods were the nektic Sepioteuthis lessoniana d’Orbigny, 1826, Sepia pharaonis Ehrenberg, 1831 and Sepiella inermis Van Hasselt, 1835. Most of the relationship models are in cubic parabolic, except when numbers of increments were estimated from age in S. pharaonis. Differences of numbers of increments from the real age were higher in the pelagic S. lessoniana when compared to the benthic sepiids. The differences were higher in juvenile stages (< 60 days after hatching) than adult stages (> 60 days) in the three species. The increment rate is close to the “one day one increment” assumption. The differences of numbers of increments from the ages and the rate of increment apposition revealed the transition point of the life cycle from 60 days of age, corresponding to the sexual maturity or adult stages. Numbers of increments with higher accuracy are reevaluated to be reliable for age determination at least for the neritic species in the tropical zone, where environmental conditions are more stable, regarding the life styles and stages in life cycles of each species.

Ontogenetic systematic characterisation of an endemic frog Rhacophorus malabaricus Jerdon, 1870 (Anura: Rhacophoridae) from Western Ghats, Kerala, India

In the present study, the complete description of the development and metamorphosis of an endemic frog Rhacophorus malabaricus, Jerdon, 1870, is documented in its natural habitat from the Southern part of Western Ghats (Peppara Wildlife Sanctuary, India). A brief illustration of each Gosner stage (fertilized egg to metamorphosed froglet) is given based on the direct monitoring and characterisation of morphological and morphometric variations. The identity of the tadpoles was confirmed by gene sequencing. Fertilisation and early development (cleavage, blastulation gastrulation and neurulation) take place inside the foam at 21.4 ± 0.1°C. The motile stage begins at 3rd day, after hatching and then eventually dropping into the water body. Hind limbs start differentiation first on the 15th day. The larva attains maximum size (TL 48.70 ± 0.22 mm) at Gosner stages 42. The morphometric measurements are significantly correlated with Gosner stages especially from 26 to 39. Oral disc features are described with LTRF of 7(3-7)/3 and KRF of 2:5+5/3. The morphological and morphometrical data of R. malabaricus larva is compared with other known Rhacophorus Kuhl & Van Hasselt, 1822 members. The present study shows that the relative lengths of TL, SVL, BH and TAL with stages are significant morphometric characters for taxonomy. Morphological features (limb bud development, pigmentation, oral disc features, etc.) are potentially useful characters for tadpole based anuran taxonomy at stage 26 or later.

Review: Slavery, Rijksmuseum, Amsterdam

Review| February 01 2022 Review: Slavery, Rijksmuseum, Amsterdam Slavery, Rijksmuseum, Amsterdam, the Netherlands. Valika Smeulders, Head of the Department of History; Eveline Sint Nicolaas, Senior Curator of History; Maria Holtrop, Curator of History; Stephanie Archangel, Junior Curator of History. May 18, 2021–August 29, 2021. https://www.rijksmuseum.nl/nl/stories/tentoonstellingen/slavernij Laura van Hasselt, Laura van Hasselt University of Amsterdam Search for other works by this author on: This Site PubMed Google Scholar Paul Knevel Paul Knevel University of Amsterdam Search for other works by this author on: This Site PubMed Google Scholar The Public Historian (2022) 44 (1): 106–111. https://doi.org/10.1525/tph.2022.44.1.106 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation Laura van Hasselt, Paul Knevel; Review: Slavery, Rijksmuseum, Amsterdam. The Public Historian 1 February 2022; 44 (1): 106–111. doi: https://doi.org/10.1525/tph.2022.44.1.106 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentThe Public Historian Search The first impression upon entering the exhibition Slavery in the Amsterdam Rijksmuseum is one of solemnity. The exhibition itself starts with an emotional bang, at least for those who wear headphones: ringing bells from former plantations and nursery rhymes and songs uttering protest against exploitation and lawlessness seem to set the tone. In reality, however, they function as prelude to a series of more traditional, aesthetically pleasing exhibition rooms. The visitors—mostly white—behave accordingly: in silence they look at the exhibited objects, meanwhile focusing on the recommended accompanying audio tour. This solemn silence not only reveals much about the exhibition style of the Rijksmuseum, but almost seems indicative of the way the Dutch treat their contested pasts. Slavery as a topic came rather late to Dutch public history. For a long time, slavery has been seen by many as a purely historical subject, something from a past long gone. In recent... You do not currently have access to this content.

Jan Lucasz. van Hasselt: A Dutch Painter in Safavid Isfahan

In February 1617, Jan Lucasz. van Hasselt arrived in Persia accompanying Pietro Della Valle (1586–1652), a Roman noble. Sometime between 1618 and 1621 Van Hasselt entered the service of Shah ʿAbbas I (r. 1588–1629), for whom he worked as a painter until the death of the shah. Later, during the reign of Shah Safi I (r. 1629–42) and until 1654 he tried to establish himself as a commercial agent for Persia. The present paper examines the career of this Dutch painter in Persia and the Netherlands. Meanwhile the artworks that may be attributed to him will be discussed.

Reproductive characters of hampala fish (hampala macrolepidota kuhl & Van Hasselt, 1823), correlation with body length

Hampala macrolepidota Kuhl & van Hasselt, 1823, known as Hampala barb or Hampala (Java), have habitat in rivers, lakes and reservoirs. Hampala barb is a member of Cyprinid family, that has an economical value, but it has not been cultivated, its entirely catch from their natural habitat. To anticipate the over need excessive exploitation of domestication efforts. The success of these efforts require a lot of information, one of which is the character of reproduction. This study aims to determine the analysis of multiple characters that include the reproduction of fish trough Gonado Somatic Index (GSI), and fecundity correlated with total length. The research method is survey, fish samples obtained every month, with a simple random sampling technique. The data are carried out by statistical analysis of the correlation between Somatic Gonado Index fund fecundity, with the total length. The results showed that the correlation between IGS male with a body length were positively correlated (r = 0.602), as well as on the female were positively correlated (r = 0.696). Fecundity ranged from 39240-256080 eggs, between fecundity with total length were positively correlated (r = 0.729).

Additional information on the Giant Himalayan Horned Frog, &lt;i&gt;Megophrys periosa&lt;/i&gt; Mahony, Kamei, Teeling &amp; Biju, 2018 (Anura: Megophryidae)

In the last decade, there has been a major revision in the cryptic species complexes of the genus Megophrys Kuhl &amp; Van Hasselt (and earlier Xenophrys), resulting in reports of many new species and new records from Arunachal Pradesh, India. Here we report additional information on the morphological variations of the recently described species Megophrys periosa Mahony, Kamei, Teeling, and Biju, 2018 (Anura: Megophryidae) from the surroundings of the type locality. The species was confirmed by generating the 16S rRNA sequences and comparing them with that of M. robusta Boulenger, 1908, a sympatric species with similar morphological characters. A preliminary phylogenetic tree has been made and discussed. Besides updating the altitudinal range for the species, a remark on the type locality is also made.

Pathways to drug prevalence estimation: synthesizing three comments on triangulation.

Pathways to drug prevalence estimation: synthesizing three comments on triangulation.

Molecular systematic investigation of Philippine puddle frogs (Anura: Dicroglossidae: Occidozyga Kuhl and Van Hasselt, 1822) reveals new candidate species and a novel pattern of species dyads

Focusing on the phylogenetic relationships of puddle frog populations spanning the biogeographic interface between Sundaland (Borneo) and the Philippines, we demonstrate, for the first time, a widespread geographic pattern involving the existence of multiple divergent and co-distributed (sympatric) evolutionary lineages, most of which are not each other’s closest relatives, and all of which we interpret as probable distinct species. This pattern of co-occurrence in the form of pairs of ecologically distinct puddle frog forms (dyads), prevails throughout northern Borneo, Palawan, Tawi-Tawi, the Sulu Archipelago, and western Mindanao (Zamboanga). Previously obscured by outdated taxonomy and logistical, legal, and security obstacles to field-based natural history studies, this pattern has remained hidden from biogeographers and amphibian biologists by an uncontested proposal that Philippine Occidozyga laevis is a single, “widespread,” and “highly variable” species. In this paper we use an integrative synthesis of new genetic data, organismal phenotypic data, historical literature reports, and ecological observations to elucidate an interesting and potentially widespread pattern of puddle frog species coexistence at the Sundaland–Philippine biogeographic interface. Calling attention to this pattern opens promising possibilities for future research aimed at understanding the scope of this dyads pattern, and whether it extends to the more northern reaches of the Philippines. On either side of Huxley’s and Wallace’s lines, data suggest that the majority of puddle frog dyads at a given locality are not each other’s closest relatives (are more distantly related, or non-monophyletic) and, thus, assembled ecologically, likely coexisting now as a result of their ecological tendencies toward distinct microhabitats (warmer stagnant pools in open areas, versus cool, flowing streams enclosed in forest). If these pairs of species types are determined to be the geographic norm among the more isolated, central, and northern, Philippine faunas, an obvious question will be whether they have evolved into dual ecological forms, possibly in response to ecological opportunity and/or reduced competition. KEYWORDS: biogeography, taxonomy, microhabitat, cryptic species

Taxonomic status of nominal species of the anchovy genus Stolephorus previously regarded as synonyms of Stolephorus commersonnii Lacepède 1803 and Stolephorus indicus (van Hasselt 1823), and descriptions of three new species (Clupeiformes: Engraulidae)

Examination of the original descriptions and available type specimens of nominal species previously regarded as synonyms of Stolephorus indicus (van Hasselt 1823) and Stolephorus commersonnii Lacepede 1803, plus a large number of non-type specimens representing an extensive geographic range, confirmed the validity of Stolephorus balinensis (Bleeker 1849), S. commersonnii, S. indicus, Stolephorus rex Jordan and Seale 1926, and Stolephorus scitulus (Fowler 1911), in addition to three new species, Stolephorus belaerius sp. nov., Stolephorus mercurius sp. nov., and Stolephorus zephyrus sp. nov. Diagnoses and detailed color descriptions are given for all of the valid species, with neotype designations for S. balinensis, S. commersonnii, and S. indicus, and clarification of their taxonomic history. Two mitochondrial markers (cytochrome b and cytochrome oxidase I genes) enabled the reconstruction of the phylogenetic relationships of five of the species examined morphologically, the genetic distinctiveness of each being indicated by at least 2.4% mean p-distance divergence from the others in the mitochondrial cytochrome oxidase I gene.

Description of a new horned toad of Megophrys Kuhl & Van Hasselt, 1822 (Amphibia, Megophryidae) from Zhejiang Province, China.

A new species of the Asian horned toad genus Megophrys is described from Zhejiang Province, China, based on multiple data. Molecular phylogenetic analyses based on mitochondrial DNA indicated the new species as an independent clade deeply clustered into the Megophrys clade. The new species is identified from its congeners by a combination of the following characters: body size small (SVL 28.4–32.4 mm in males); vomerine teeth absent; tongue not notched behind; tympanum distinctly visible, oval; a small horn-like tubercle present at the edge of each upper eyelid; two metacarpal tubercles distinctly visible in hand; toes without webbing; heels overlapped when thighs are positioned at right angles to the body; tibiotarsal articulation reaching the level to middle of eye when leg stretched forward; an internal single subgular vocal sac in male; in breeding male, the nuptial pads present on the dorsal base of the first two fingers.

Multiple data revealed two new species of the Asian horned toad Megophrys Kuhl & Van Hasselt, 1822 (Anura, Megophryidae) from the eastern corner of the Himalayas.

Multiple disciplines can help to discover cryptic species and resolve taxonomic confusions. The Asian horned toad genus Megophryssensu lato as a diverse group was proposed to contain dozens of cryptic species. Based on molecular phylogenetics, morphology, osteology, and bioacoustics data, the species profiles of Megophrys toads in the eastern corner of Himalayas in Medog County, Tibet Autonomous Region, China was investigated. The results indicated that this small area harbored at least four Megophrys species, i.e., M. medogensis, M. pachyproctus, Megophrys zhouisp. nov., and Megophrys yeaesp. nov., the latter two being described in this study. Additionally, the mitochondrial DNA trees nested the low-middle-elevation and high-elevation groups of M. medogensis into a monophyletic group, being in discordance with the paraphyletic relationship between them revealed in the nuclear DNA trees. The findings highlighted the underestimated biodiversity in Himalayas, and further indicated that the Megophrys toads here have been probably experienced complicated evolutionary history, for example, introgression between clades or incomplete lineage sorting and niche divergences in microhabitats. Anyway, it is urgent for us to explore the problems because these toads are suffering from increasing threats from human activities and climatic changes.

Description of a new horned toad of Megophrys Kuhl & Van Hasselt, 1822 (Anura, Megophryidae) from southwest China.

A new species of the genus Megophrys is described from Guizhou Province, China. Molecular phylogenetic analyses supported the new species as an independent clade nested into the Megophrys. The new species could be distinguished from its congeners by a combination of the following characters: body size moderate (SVL 49.3–58.2 mm in males); vomerine ridges present distinctly, vomerine teeth present; tongue feebly notched behind; tympanum distinctly visible, oval; two metacarpal tubercles in hand; toes with one-third webbing and wide lateral fringes; heels overlapped when thighs are positioned at right angles to the body; tibiotarsal articulation reaching the level between tympanum and eye when leg stretched forward; an internal single subgular vocal sac present in male; in breeding male, the nuptial pads with large and sparse black nuptial spines present on the dorsal bases of the first two fingers.

On the Plakobranchidae (Gastropoda, Sacoglossa) from soft sediment habitats of Koh Tao, Gulf of Thailand, with descriptions of two new species.

Research in recent years have provided rapid advances in biogeographic and taxonomic documentation of sea slugs around the world. However, efforts are lacking in surveying most coastlines and habitats in South-East Asia. Recent studies from the Gulf of Thailand have indicated that a wealth of unexplored sea slug diversity and ecology may be gained from an investigation of soft sediment habitats beyond the reef slopes. Additionally, the waters of Koh Tao have been found to host regionally high levels of sea slug diversity with several species awaiting taxonomic clarification. In this work the initial findings of an expanded survey effort from the waters around Koh Tao are provided, with the identity of two soft sediment-associated sacoglossan species in the family Plakobranchidae being investigated. By integrating morphological and molecular analyses, the species Plakobranchus noctisstellatussp. nov. and Elysia aowthaisp. nov. are described and species complexes surrounding Plakobranchus ocellatus van Hasselt, 1824 and Elysia japonica Eliot, 1913 are discussed. The topics of morphological variability and the cryptic species problem are also discussed.

An Iranian Youth in an Album from Zwolle

In the family scrapbook compiled by Gesina ter Borch (1633-1690), there is a remarkable drawing of an Iranian youth. Art-historical and scientific research has revealed that although the drawing has areas of later overpainting, there is an original Safavid miniature from the sixteen-fifties or sixties underneath them. It is likely that Gesina herself was responsible for these overpaints, when she mounted the badly damaged miniature in her album at some time between 1660 and 1680. Interestingly, aside from the blackened background and the colourful feather and sashes she added, she attempted to follow the original Iranian style in her restorations. The original was made in the sixteen-fifties or sixties by a painter of the Isfahan School, who probably took his inspiration from an older composition by the famous court artist, Riza Abbasi. The article goes on to show that Riza Abbasi’s work was known in the Dutch Republic before then. In 1623 the junior merchant Niclaes Hem travelled to Iran. He was a member of a Dutch East India Company delegation seeking to negotiate a trade agreement with the Shah. Hem acquired a series of drawings by or after Riza Abbasi while he was in Isfahan. He was probably helped in this acquisition by his fellow countryman, Jan van Hasselt. A number of the original miniatures that Hem took back to the Republic were published as woodcuts in Johannes de Laet’s Persia (1634).

A description of the tadpole of Megophrys "Brachytarsophrys" intermedia (Smith, 1921).

Megophrys Kuhl and Van Hasselt are an Asian radiation of terrestrial frogs which are usually associated with montane forest (Mahony et al. 2017). The Annam horned frog (Megophrys intermedia) is reported from montane evergreen forest in Vietnam and Lao People's Democratic Republic (Stuart 2005; Hendrix et al. 2008; Nguyen et al. 2009; Tran 2013; Orlov et al. 2015; IUCN 2017; Mahony et al. 2017). The IUCN Red List assessment for the species reports an elevational range of 782-1500 m asl (IUCN 2017) although the type locality was reported to be above 1500 m asl (Smith 1921), and Tran (2013) collected a specimen at 1515 m asl. Megophrys intermedia is assessed as Least Concern (IUCN 2017) and little is known about the reproductive behaviour and life history of the species. In Lam Dong Province (Vietnam), male M. intermedia call in March (Tran 2013); on the Langbian Plateau (Vietnam), male specimens are reported to call by day and by night from March to May and specimens called from within deep crevices between boulders in streams (Smith 1921); in Xe Kong Province (Laos), males call or guard egg clutches that are laid in water in July (Stuart 2005).