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Registros recuperados: 169
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The pattern of dermal-vertebral correlation in snakes and amphisbaenians Naturalis
Alexander, A.A.; Gans, C..
INTRODUCTION It has long been known that the arrangement of external scales retains a constant relation to the primary pattern of mesodermal segmentation. The ratio of the number of dermal scale rows or annuli to the number of vertebrae has, therefore, been considered to be of fundamental importance in squamate classification (Stehli, 1910; Camp, 1923). Yet the difficulty of determining it has fostered the presentation of hypotheses based on relatively few total counts; some such hypotheses have relied upon comparisons made by dissection along limited portions of the trunk. The general implication communicated by the many statements in the literature has been that the ratios are constant at the generic or familial level, that the ratios ordinarily...
Tipo: Article / Letter to the editor Palavras-chave: 42.82.
Ano: 1966 URL: http://www.repository.naturalis.nl/record/318394
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Morphological variation in two genetically distinct groups of the golden-striped salamander, Chioglossa lusitanica (Amphibia: Urodela) Naturalis
Alexandrino, J.; Ferrand, N.; Arntzen, J.W..
Morphometric and colour pattern variation in the endemic Iberian salamander Chioglossa lusitanica is concordant with the genetic differentiation of two groups of populations separated by the Mondego river in Portugal. Salamanders from the south have shorter digits than those from the north. Clinal variation with a south to north increase in limb, toe and finger length was found superimposed on this dichotomy, resulting in stepped clines for characters describing appendage size. Genetic variability was paralleled by colour pattern variability in the contact zone and in northern populations. To explain the observed parallels we invoke the neutral processes of vicariant isolation, admixture in a secondary contact zone, genetic drift in addition to selection...
Tipo: Article / Letter to the editor Palavras-chave: Amphibia; Chioglossa lusitanica; Clinal variation; Colour pattern; Golden-striped salamander; Morphometrics; 42.82.
Ano: 2005 URL: http://www.repository.naturalis.nl/record/209648
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Development, comparative morphology and cornification of reptilian claws in relation to claws evolution in tetrapods Naturalis
Alibardi, L..
The development of claws in different reptiles and their cornification are analyzed using histological, ultrastructural and autoradiographic methods. Claws develop at the tip of digits in relation to the growth of the terminal phalanx and appear as modified scales. The apical epidermis of digit becomes thickened and is associated with a mesenchymal condensation or a dense mesenchyme. The dorsal side of the digit becomes the unguis while the ventral side becomes the sub-unguis. The corneous layer in the unguis is thicker than in the sub-unguis and accumulates hard-keratin while corneocytes remain separated or partially fused. Bundles of hard-keratin tend to accumulate in parallel orientation with respect to the surface and are directed toward the claw tip....
Tipo: Article / Letter to the editor Palavras-chave: Autoradiography; Claws; Cornification; Histogenesis; Reptiles; Ultrastructure; 42.82.
Ano: 2009 URL: http://www.repository.naturalis.nl/record/304588
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Morphological re-evaluation of the parotoid glands of Bufo ictericus (Amphibia, Anura, Bufonidae) Naturalis
Almeida, P.G. de; Felsemburgh, F.A.; Azevedo, R.A.; Brito-Gitirana, L. de.
Multicellular glands in the amphibian integument represent a signifi cant evolutionary advance over those of fi shes. Bufonids have parotoid glands, symmetrically disposed in a post-orbital position. Their secretion may contribute to protection against predators and parasites. This study provides a re-evaluation of the morphology of the Bufo ictericus parotoid glands. The parotoid gland integument of the medial surface shows rounded depressions with small pores that connect with the duct openings of the larger granular glands. Under light microscopic evaluation the integument is constituted by typical epidermis, supported by dermis subdivided into a spongious dermis, a reticular dermis, and a compact dermis. The Eberth-Katschenko layer is...
Tipo: Article / Letter to the editor Palavras-chave: Morphology; Amphibian integument; Exocrine glands; Bufonid; 42.82; 42.62.
Ano: 2007 URL: http://www.repository.naturalis.nl/record/256117
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Lizards with northern affinities from the mountains of Oman Naturalis
Arnold, E.N..
Oman material of four lizard species is described and discussed ; it comprises specimens of a previously undescribed gecko, Phyllodactylus gallagheri, two lacertids — the poorly known Lacerta jayakari Boulenger, 1887, and L. cyanura, also described here for the first time, and a skink, Ablepharus pannonicus Lichtenstein, 1823. These species have no strong affinities with any members of the mainly Saharo-Sindian fauna now occupying much of Arabia but are closely related to forms occurring to the north of the peninsula. It is probable that they are relicts of a more temperate fauna which once entered more extensively into southeastern Arabia. As might be expected, all four species are absent from the desert areas of Oman and are confined to the disjunct...
Tipo: Article / Letter to the editor Palavras-chave: 42.82.
Ano: 1972 URL: http://www.repository.naturalis.nl/record/319250
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Drastic population size change in two populations of the Golden-striped salamander over a forty year period - are eucalypt plantations to blame? Naturalis
Arntzen, J.W..
Over the last half century the Iberian peninsula has seen the large scale planting of exotic gum trees (Eucalyptus sp.) therewith reducing space for native wildlife. An additional effect of the gum tree plantations may be the lowering of the water table in adjacent streams, to which amphibian species with a larval niche in the running sections of small streams would be especially susceptible. In northwestern Iberia that niche is occupied by the Golden-striped salamander, Chioglossa lusitanica. I here report on the demographic trends of two C. lusitanica populations over a forty year period, in two areas of one mountain range near Porto in northwestern Portugal. In both areas advantage was taken of the migration pattern of C. lusitanica to sites for...
Tipo: Article / Letter to the editor Palavras-chave: Amphibian decline; Chioglossa lusitanica; Demographic modelling; Gum tree; Iberia; Monoculture; Portugal; Urodela; Vortex; 42.82.
Ano: 2015 URL: http://www.repository.naturalis.nl/record/569285
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Vertebral number is highly evolvable in salamanders and newts (family Salamandridae) and variably associated with climatic parameters Naturalis
Arntzen, J.W.; Beukema, W.; Galis, F.; Ivanović, A..
In vertebrates, the relative proportion of the number of trunk and caudal vertebrae is an important determinant of body shape. While among amphibians frogs and toads show low variation in vertebrae numbers, in salamanders the numbers of trunk and caudal vertebrae vary widely, giving rise to phenotypes in the range from short-bodied and long-tailed to long-bodied and short-tailed. We analysed vertebral numbers in the family Salamandridae in a phylogenetic context and calculated the relationship between vertebral changes and changes in climate and other environmental parameters. A significant association was found between morphological change with precipitation and temperature. However, annual precipitation affected the two main groups of salamandrid...
Tipo: Article / Letter to the editor Palavras-chave: Ancestral character states; Body shape; Climatic niche; Comparative method; Phylogeny; Vertebral column; 42.82.
Ano: 2015 URL: http://www.repository.naturalis.nl/record/533923
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Additional results and discussion to the paper: Asymmetric viability of reciprocal-cross hybrids between crested and marbled newts (Triturus cristatus and T. marmoratus) Naturalis
Arntzen, J.W.; Jehle, R.; Bardakci, F.; Burke, T.; Wallis, G.P..
Hybridization between divergent lineages often results in reduced hybrid viability. Here we report findings from a series of independent molecular analyses over several seasons on four life stages of F1 hybrids between the newts Triturus cristatus and T. marmoratus. These two species form a bimodal hybrid zone of broad overlap in France, with F1 hybrids making up about 4% of the adult population. We demonstrate strong asymmetry in the direction of the cross, with one class (cristatus-mothered) making up about 90% of F1 hybrids. By analyzing embryos and hatchlings, we show that this asymmetry is not due to prezygotic effects, as both classes of hybrid embryos are present at similar frequencies, implicating differential selection on the two hybrid classes...
Tipo: Article / Letter to the editor Palavras-chave: Allozyme; Bateson–Dobzhansky–Muller incompatibility; Cytonuclear incompatibility; Hybridization; Microsatellite; MtDNA; Postzygotic isolation asymmetry; Triturus; 42.82.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/289893
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Morphological and genetic differentiation of Bufo toads: two cryptic species in Western Europe (Anura, Bufonidae) Naturalis
Arntzen, J.W.; McAtear, J.; Recuero, E.; Ziermann, J.M.; Ohler, A.; Alphen, J. van; Martínez-Solano, I..
The Common toad Bufo bufo sensu lato is a widespread, morphologically conserved taxon. Recent studies have uncovered deep genetic differentiation between population groups, highlighting the need to revise the current taxonomy of the group and recognize additional species. Here we investigate patterns of variation in molecular (a mitochondrial DNA restriction enzyme assay and sequence data for two nuclear DNA fragments totalling 979 bp) and 17 morphological variables in Northern France where two of these groups meet (B. bufo sensu stricto and B. spinosus), in order to delineate their contact zone and uncover characters that would allow discrimination of the two taxa. Mitochondrial DNA data show an abrupt transition from areas where B. bufo is present to...
Tipo: Article / Letter to the editor Palavras-chave: Bufo bufo; Bufo spinosus; Common toad; Contact zone; France; Mitochondrial DNA; Morphometrics; Nuclear DNA; 42.82.
Ano: 2013 URL: http://www.repository.naturalis.nl/record/475530
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How complex is the Bufo bufo species group? Naturalis
Arntzen, J.W.; Recuero, E.; Canestrelli, D.; Martínez-Solano, I..
Species delineation remains one of the most challenging tasks in the study of biodiversity, mostly owing to the application of different species concepts, which results in contrasting taxonomic arrangements. This has important practical consequences, since species are basic units in fields like ecology and conservation biology. We here review molecular genetic evidence relevant to the systematics of toads in the Bufo bufo species group (Anura, Bufonidae). Two studies recently published in this journal (Recuero et al., MPE 62: 71–86 and Garci´a-Porta et al., MPE 63: 113–130) addressed this issue but reached opposing conclusions on the taxonomy of the group (four versus two species). In particular, allozyme data in the latter paper were interpreted as...
Tipo: Article / Letter to the editor Palavras-chave: Bufo bufo; Bufo spinosus; Molecular systematics; Bufo verrucosissimus; Phylogeny; Allozymes; 42.82.
Ano: 2013 URL: http://www.repository.naturalis.nl/record/470065
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The phylogeny of crested newts (Triturus cristatus superspecies): nuclear and mitochondrial genetic characters suggest a hard polytomy, in line with the paleogeography of the centre of origin Naturalis
Arntzen, J.W.; Themudo, G. Espregueira; Wielstra, B..
Newts of the genus Triturus (Amphibia, Caudata, Salamandridae) are distributed across Europe and adjacent Asia. In spite of its prominence as a model system for evolutionary research, the phylogeny of Triturus has remained incompletely solved. Our aim was to rectify this situation, to which we employed nuclear encoded proteins (40 loci) and mitochondrial DNA-sequence data (mtDNA, 642 bp of the ND4 gene). We sampled up to four populations per species covering large parts of their ranges. Allozyme and mtDNA data were analyzed separately with parsimony, distance, likelihood and Bayesian methods of phylogenetic inference. Existing knowledge on taxonomic relationships was confirmed, including the monophyly of the genus and the groups of crested newts (four...
Tipo: Article / Letter to the editor Palavras-chave: Allozymes; Historical biogeography; Mitochondrial DNA-sequences; Triturus macedonicus; Triturus marmoratus; Vicariance; 42.82.
Ano: 2007 URL: http://www.repository.naturalis.nl/record/262648
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Triadobatrachus massinoti, the earliest known lissamphibian (Vertebrata: Tetrapoda) re-examined by μCT scan, and the evolution of trunk length in batrachians Naturalis
Ascarrunz, E.; Rage , J.-C.; Legreneur, P.; Laurin, M..
Triadobatrachus massinoti is a batrachian known from a single fossil from the Early Triassic of Madagascar that presents a combination of apomorphic salientian and plesiomorphic batrachian characters. Herein we offer a revised description of the specimen based on X-ray micro-tomography data. We report previously unknown caudal vertebrae, possible mentomeckelians, and hidden parts of other structures. We also confirm the presence of a ventrolateral ledge on the opisthotic, and we rectify some previous interpretations. There are no cervical ribs and the jaw may have had an angular. The presacral region is composed of 15 vertebrae with a unique atlas-axis complex instead of 14 vertebrae with a bipartite atlas. The configuration of the pelvic girdle is not...
Tipo: Article / Letter to the editor Palavras-chave: Anura; Caudopelvic apparatus; CT scan; Salientia; Triassic; Trunk evolution; 42.82.
Ano: 2016 URL: http://www.repository.naturalis.nl/record/610011
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Lizards of Brazilian Amazonia (Reptilia: Squamata) Naturalis
Avila-Pires, T.C.S..
Eighty-nine species of lizards, six of which polytypic (forming a total of 97 taxa), are presently known from Brazilian Amazonia. This number includes six species and one subspecies described as new to science in this paper: Stenocercus fimbriatus, Lepidoblepharis hoogmoedi, Leposoma osvaldoi, L. snethlageae, Tretioscincus oriximinensis, Tupinambis longilineus, and Anolis nitens tandai. Stenocercus dumerilii is resurrected from the synonymy of S. tricristatus. Bachia cophias is considered a junior synonym of B. flavescens. B. peruana is a new record from Brazil. Anolis nitens has priority over A. chrysolepis. The Amazonian Tupinambis is shown to be T. teguixin (of which T. nigropunctatus is a junior synonym). The name T. merianae should be used for T....
Tipo: Article / Letter to the editor Palavras-chave: Reptilia; Squamata; Lizards; Amazonia; Brazil; Zoogeography; Key.; 42.82.
Ano: 1995 URL: http://www.repository.naturalis.nl/record/317788
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On two new species of Pseudogonatodes Ruthven, 1915 (Reptilia: Squamata: Gekkonidae), with remarks on the distribution of some other sphaerodactyl lizards Naturalis
Avila-Pires, T.C.S.; Hoogmoed, M.S..
Two new species of Pseudogonatodes Ruthven, 1915, are described, one from the Rio Juruá Basin, in the state of Acre, Brazil (Amazonian rainforest), the other from Rancho Grande, in the state Aragua, Venezuela (cloud forest). Both have granular dorsals and relatively numerous fourth toe lamellae, of which the third (from tip to base of toe) is not distinctly larger than the two distal ones. The species from the Rio Juruá is small, with dark belly, and recognised, among other characteristics, by its tall, conical to flat-conical dorsals. That from Rancho Grande is relatively large, with low number of ventrals, and mental with a straight or convex posterior segment medially, among other distinctive characteristics. Some remarks on the geographic distribution...
Tipo: Article / Letter to the editor Palavras-chave: Coleodactylus; Gonatodes; Lepidoblepharis; Pseudogonatodes; Reptilia; Squamata; Lizards; New species; New record; Brazil; Venezuela; Geographic distribution; Amazonian rainforest; Cloud forest.; 42.82.
Ano: 1999 URL: http://www.repository.naturalis.nl/record/215261
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The Taxinomic Status of Hemidactylus Nigriventris (Reptilia: Saura: Gekkonidaea) Naturalis
Bastinck, J..
Hemidactylus nigriventris Van Lidth de Jeude, 1905, known only from the holotype from Sintang, Borneo, is shown to be conspecific with H.frenatus Duméril & Bibron, 1836.
Tipo: Article / Letter to the editor Palavras-chave: Gekkonidae; Hemidactylus; Osteology; Taxonomy; 42.82.
Ano: 1985 URL: http://www.repository.naturalis.nl/record/317966
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The Anatomy of Natrix vittata (L.) Naturalis
Bergman, R.A.M..
MATERIAL AND PROBLEM For the investigation of the anatomical pattern of Natrix vittata, the same material was used as for the description of the life of this snake. A preliminary question was whether both groups from Surabaia and from Tjimahi may be used for statistical treatment as a single unit or if they represent different varieties. The animals are easily recognisable and there is no outward sign which would indicate a difference between the group from the eastern coastal plains and the one from the western hills although the distance between both localities is about 800 km. The range of the body length is for both groups the same, for adult males in Surabaia 341-441 and in Tjimahi 346-457, and for females 392-560 and 395-555. In none of the other...
Tipo: Article / Letter to the editor Palavras-chave: 42.82.
Ano: 1950 URL: http://www.repository.naturalis.nl/record/318227
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The anatomy of Xenopeltis unicolor Naturalis
Bergman, R.A.M..
General aspect. Xenopeltis unicolor Reinwardt is a burrowing snake, living in South East Asia and in Indonesia. It is easily recognisable even at first sight, both by its peculiar colouring and by the shape of the head, which shows a dorso-ventrally flattened snout, with a curiously rounded frontal margin. Haas (1930) is right in stating that there is probably no other snake with such a remarkable 'physiognomy'. In its way of moving around it seems not to lift the head before going on, but rather to shove it sideways to right and left and then proceed on its way. The scales are very flat and make a completely smooth covering for the animal, this being considered another adaptation to the burrowing life. The name Xenopeltis, however, does not refer to this...
Tipo: Article / Letter to the editor Palavras-chave: 42.82.
Ano: 1955 URL: http://www.repository.naturalis.nl/record/319012
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The Life of Natrix vittata (L.) Naturalis
Bergman, R.A.M..
GENERAL CHARACTER Natrix vittata, the striped swimmer, is a harmless little snake, about half a meter long and as thin as a little finger, living in Java on coastal plains and in the hills up to 1200 m above see level. In a given area she will be very common but in adjacent regions, which to us may present exactly the same character of humidity, altitude, temperature, vegetation, etc., there will be only very occasionally a Natrix vittata among the catch (de Haas, 1941a). Even in the field she is easily recognisable, as she will lift her head high enough to show the curious design of her ventral shields. If there is an opportunity for examining the snake more closely, the twin small white spots on the head shields will identify her. The colour of the body...
Tipo: Article / Letter to the editor Palavras-chave: 42.82.
Ano: 1950 URL: http://www.repository.naturalis.nl/record/319075
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DNA barcoding, phylogeny and systematics of Golden-backed frogs (Hylarana, Ranidae) of the Western Ghats-Sri Lanka biodiversity hotspot, with the description of seven new species Naturalis
Biju, S.D.; Garg, S.; Mahony, S.; Wijayathilaka, N.; Senevirathne, G.; Meegaskumbura, M..
A systematic revision of the genus Hylarana in the Western Ghats-Sri Lanka biodiversity hotspot is presented. Species delineation in Hylarana is complicated due to a lack of distinct colour differences or striking morphological characters, leading to potential misidentification. We conducted extensive surveys throughout the Western Ghats-Sri Lanka biodiversity hotspot and performed multiple gene (16S, COI and Cytb) barcoding using 103 samples collected from cultivated land and natural habitats. Genetic distance comparisons and Neighbor Joining trees indicated the presence of at least 14 candidate species in the region, supported by taxa groupings for all three genetic markers. Utilising a combination of molecular and morphological data, we describe seven...
Tipo: Article / Letter to the editor Palavras-chave: Amphibia; Cryptic species; Endemism; Integrative taxonomy; Lectotypification; Multiple gene barcoding; Neotypification; Taxonomic revision; 42.82; 42.64.
Ano: 2014 URL: http://www.repository.naturalis.nl/record/506456
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Checklist of the living monitor lizards of the world (family Varanidae) Naturalis
Böhme, W..
Tipo: Article / Letter to the editor Palavras-chave: Checklist; Varanus; Recent taxa; Geographical distribution; 42.82.
Ano: 2003 URL: http://www.repository.naturalis.nl/record/220215
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