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  • crystal structure
  • evolution
  • kinetics
  • morphology
  • 2000-2004  (271)
  • 1990-1994  (1.207)
  • 1
    Publikationsdatum: 2015-05-08
    Beschreibung: The Tenasserim lutung Trachypithecus barbei was previously known from museum specimens and field observations only. We discovered a zoo specimen and present the first confirmed evidence for the continued existence of the species since 1967. We describe the cranial pelage and coloration characteristics of this species which were previously unknown. We present first molecular evidence for recognizing T. barbei as a distinct species and for assessing its phylogenetic affinities relative to other members of the genus Trachypithecus. We document the taxonomic history of T. barbei and present a distribution map based on a compilation of all known locality records.
    Schlagwort(e): Trachypithecus barbei ; taxonomy ; systematics ; evolution ; genetics
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: Article / Letter to the editor
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    In:  Contributions to Zoology (1383-4517) vol.71 (2002) nr.1/3 p.9
    Publikationsdatum: 2015-05-08
    Beschreibung: Investigations of amphipod embryonic development have a long tradition. However, many aspects of amphipod embryology are still controversial. These concern, among others, the nature of the cleavage, the origin of the germ disc, and the mode of gastrulation. On the other hand, amphipods show the same characteristic type of invariant cell division pattern in the germ band as other malacostracans. Since amphipods seem to undergo a stereotyped pattern of early cleavage they are highly interesting for our understanding of the evolution of arthropod development. In this paper, we describe the cleavage pattern of the amphipod crustacean Orchestia cavimana from the zygote to gastrulation and the formation of the germ disc using direct observation, scanning electron microscopy, histology, video recording, and lineage tracing with a vital dye. The early development follows the mode of a total, radial, unequal cleavage with a determinate stereotyped pattern. A small transient blastocoel is formed. The 8-cell stage is characterised by 4 micromeres and 4 macromeres. One quadrant is smaller than the others. There are two kinds of eggs that show a mirror handed image. The 16-cell stage is the last regular stage after which the blastomeres divide highly asynchronously. The germ disc is formed by the descendants of the macromeres and some micromere derivatives. The other micromeres constitute the extra-embryonic region. Migration of macromere descendants is involved in germ disc formation accompanied by the extrusion of the yolk. During this process some vitellophages are formed. The gastrulation sensu stricto is initiated by the micromere derivatives of the smallest quadrant at the anterior of the forming germ disc. A true blastopore occurs which involves an invagination and the immigration of cells. Our data help to correct erroneous interpretations of former students of amphipod development. We can show that many chaiacters of amphipod embryonic development are apomorphic supporting amphipod monophyly. With the present investigation we contribute to a complete understanding of the embryonic cell lineage of amphipods from the egg to segment formation and organogenesis.
    Schlagwort(e): cell lineage ; cell migration ; Arthropoda ; phylogeny ; evolution
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: Article / Letter to the editor
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    In:  Beaufortia (0067-4745) vol.51 (2001) nr.6 p.103
    Publikationsdatum: 2015-06-03
    Beschreibung: A detailed and amended description of the external morphology of the male of the troglobitic species Neobisium cavernarum (L. Koch 1873) from the cave Grotte d’Aubert, Ariège, France is presented. Taxonomic interrelationships with Neobisium simoni (L. Koch 1873) are also considered.
    Schlagwort(e): Pseudoscorpiones ; Neobisiidae ; Neobisium cavernarum ; morphology ; caves ; France
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: Article / Letter to the editor
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    In:  Bijdragen tot de dierkunde vol. 64 no. 1, pp. 33-53
    Publikationsdatum: 2024-01-12
    Beschreibung: A morphologically distinct cavernicolous salamander Proteus anguinus from southeastern Slovenia (Bela Krajina) is described as P. a. parkelj ssp. n. It differs from P. a. anguinus in a dark pigmentation, fully developed eyes, a skull with broader and shorter bones and fewer teeth, a voluminous jaw musculature that gives the head a bulky appearance, a proportionally longer trunk with a higher number of vertebrae, shorter extremities, and a shorter tail. Most of these traits are considered to be plesiomorphic character states. An allozyme analysis over 40 loci has shown the new dark pigmented taxon to be genetically similar to a white and troglomorphic neighbouring population from Sti\xc4\x8dna (DNei = 0.23). Both populations in turn are genetically dissimilar to a geographically more distant population from Postojna (DNei = 0.49). The observed level of genetic differentiation suggests that western and southeastern Slovenian populations form separate lineages since the uppermost Miocene but conservatively hitherto only a single species is recognised. The new taxon is only known from a small area and may be rare. P. a. parkelj now under strict legal protection, is threatened by industrial pollution.
    Schlagwort(e): Urodela ; Proteus ; taxonomy ; morphology ; allozyme analysis ; ecology ; distribution
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 2024-02-01
    Beschreibung: The morphology of 25 species of the family Eudendriidae was studied, with special regard to their reproductive organs, using techniques of SEM and optical microscopy. Whenever possible a re-analysis of the diagnostic characters of these species was carried out. Furthermore, several synonymies were confirmed or discussed and remarks on taxonomical details are presented. A developmental (ontogenetical) series is proposed for the reproductive differentiation, and its usefulness for phylogenetic analysis is considered.
    Schlagwort(e): Hydrozoa ; Eudendriidae ; Eudendrium ; Myrionema ; systematics ; morphology ; SEM ; optical microscopy
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Publikationsdatum: 2024-01-12
    Beschreibung: Two species of Roncus L. Koch, 1873 (Neobisiidae), new to science (R. ciobanmos n. sp. and R. dragobete n. sp.), and one species of Neobisium Chamberlin, 1930 [N. (N). biharicum Beier, 1939], collected in the Movile Cave, southern Dobrogea, Romania, have been described, diagnostic characters illustrated, and their geographic distribution analyzed. In addition, the description of Chthonius (Chthonius) monicae Boghean, 1989 (Chthoniidae), otherwise known only from two females, has been amended. The possible relationships of these species are discussed in view of the importance of some diagnostic characters and of the evolution of their cave habitat.
    Schlagwort(e): Cave fauna ; taxonomy ; biogeography ; evolution ; pseudoscorpions ; Chthoniidae ; Neobisiidae ; Chthonius ; Roncus ; Neobisium ; new species
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Publikationsdatum: 2024-01-12
    Beschreibung: Some short remarks are made on taxonomic problems in the genus Echinogammarus and a description is given of a new species from mountain streams in Algeria, characterized by a onesegmented exopodite in uropod 3.
    Schlagwort(e): Taxonomy ; morphology ; Echinogammarus ; Algeria ; Amphipoda
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    In:  Zoologische Verhandelingen vol. 258 no. 1, pp. 1-95
    Publikationsdatum: 2024-01-12
    Beschreibung: A phylogenetic analysis of the subfamilies of the family Braconidae Nees, 1812 is presented. The analysis employing 96 phylogenetically informative characters was performed using the computerized parsimony programmes PAUP and Hennig86. The cladograms obtained show that the Braconidae can be divided into three major groups of subfamilies. These are a lineage comprising the mainly ectoparasitic cyclostomes and relatives, and two advanced endoparasitic groups, both apparently derived from somewhere near the endoparasitic cyclostome subfamily Rogadinae Foerster, 1862 sensu stricto. As a result of the phylogenetic analysis subfamily rank is given to the Exothecinae Foerster, 1862 (including the Hormiini Foerster, 1862), the Rhyssalinae Foerster, 1862 (including the Pambolini Marshall, 1885), the Charmontinae van Achterberg, 1979, and the Microtypinae Sz\xc3\xa9pligeti, 1908. The tribes Meteorini Cresson, 1887 and Muesebeckiini Mason, 1969 are retained as tribes because this analysis did not provide conclusive arguments to separate these groups from the Euphorinae Foerster, 1862 sensu stricto and the Ichneutinae Foerster, 1862 sensu stricto, respectively. The limits of the subfamily Rogadinae Foerster, 1862 are narrowed to include only endoparasitic taxa.
    Schlagwort(e): phylogeny ; Braconidae ; subfamilies ; morphology ; ovipositor-shape ; metasomal glands ; biology.
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Publikationsdatum: 2024-01-12
    Beschreibung: Originally described by L\xc3\xb6ffler in 1962 as a variety of Mesocyclops longisetus, M. araucanus was found to have autapomorphies of its own to deserve specific rank. For a long time the identification of these two species were mixed up. Here, M. araucanus female is redescribed and the male described for the first time. A comparison is made with M. longisetus, whose male is also described for the first time. Detailed comparison between these two species shows that the following traits on specimens of both sexes can be used to separate the species: length/width ratio of caudal rami, ratio of terminal caudal setae, and length/width ratio of last segment of endopod of leg 4. Additional diagnostic characters for each sex are given. The geographic distributions of these two species do not overlap.
    Schlagwort(e): Copepoda ; Cyclopoida ; Mesocyclops ; South America ; morphology
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Publikationsdatum: 2024-01-12
    Beschreibung: A detailed and amended description of the external morphology of the male of the troglobitic species Neobisium cavernarum (L. Koch 1873) from the cave Grotte d\xe2\x80\x99Aubert, Ari\xc3\xa8ge, France is presented. Taxonomic interrelationships with Neobisium simoni (L. Koch 1873) are also considered.
    Schlagwort(e): Pseudoscorpiones ; Neobisiidae ; Neobisium cavernarum ; morphology ; caves ; France
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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