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| Registros recuperados: 14 | |
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| Schilthuizen, M.. |
| The Choleva agilis-group is revised. The three species are redescribed and their zoogeography is discussed. The phylogeny of the three species is hypothesized. Choleva jailensis Jeannel, 1923 and C. agilis clermonti van der Wiel, 1931 are new synonyms of C. agilis (Illiger, 1798). C. lederiana var. brevicollis Krogerus, 1926, is a new synonym of C. lederiana Reitter, 1901. The cavernicolous taxon gracilenta Szymczakowski, 1957, formerly regarded as a subspecies of C. lederiana, is transferred to C. septentrionis Jeannel, 1923. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Cholevidae; Choleva; Key; Phylogeny; Zoogeography; Variability; Europe; 42.75. |
| Ano: 1990 |
URL: http://www.repository.naturalis.nl/record/318021 |
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| Schilthuizen, M.; Welter-Schultes, F.W.; Wiese, V.. |
| On the basis of both detailed distributional field studies and morphological analyses, a revision of the polytypic species Albinaria hippolyti from Central and Eastern Crete is presented. True subspecies are distinguished from mere geographic varieties by the presence of narrow hybrid zones. Using this criterion, four adjoining subspecies are recognised: A. h. hippolyti (Boettger, 1878), A. h. aphrodite (Boettger, 1883), A. h. holtzi (Sturany, 1904) and A. h. harmonia subspec. nov. Additionally, two geographically isolated and conchologically distinctive forms are also treated as subspecies: A. h. arthuriana (Boettger, 1878) and A. h. asterousea subspec. nov. The geographical distribution and variability of each subspecies is described in detail. A. h.... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Gastropoda; Pulmonata; Clausiliidae; Albinaria hippolyti; Taxonomy; Hybrid zones; Variability; Zoogeography; 42.73. |
| Ano: 1993 |
URL: http://www.repository.naturalis.nl/record/318774 |
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| Schilthuizen, M.. |
| Since Solem’s provocative claim in the early 1980s that land snails in tropical forests are neither abundant nor diverse, at least 30 quantitative-ecological papers on tropical land snail communities have appeared. Jointly, these papers have shown that site diversity is, in fact, high in tropical forests; often more than 100 species have been recorded per site, which is somewhat more than normally found at sites in higher latitudes. At the same time, however, point diversities (which usually range between 10 and 30 species per quadrat) appear to be no different from the ones recorded for temperate localities, which suggests that the number of ways in which syntopic resource space can be subdivided among different land snail species has an upper limit that... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Mollusca; Gastropoda; Rain forests; Species-richness; Biodiversity; Species-abundance-distributions; 42.73. |
| Ano: 2011 |
URL: http://www.repository.naturalis.nl/record/366791 |
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I made use of the known dates of reclamation (and of afforestations) in the IJsselmeerpolders in The Netherlands to assess evolutionary adaptation in Cepaea nemoralis. At 12 localities (three in each polder), I sampled a total of 4390 adult individuals in paired open and shaded habitats, on average 233m apart, and scored these for genetic shell colour polymorphisms. The results show (highly) significant differentiation at most localities, although the genes involved differed per locality. Overall, though, populations in shaded habitats had evolved towards darker shells than those in adjacent open habitats, whereas a 'Cain & Sheppard' diagram (proportion yellow shells plotted against ‘effectively unbanded’ shells) failed to reveal a clear pattern. This might suggest that thermal selection is more important than visual selection in generating this pattern. Trait differentiation, regardless of whether they were plotted against polder age or habitat age, showed a linear increase of differentiation with time, corresponding to a mean rate of trait evolution of 15–31 kilodarwin. In conclusion, C. nemoralis is capable of rapid and considerable evolutionary differentiation over 1–25 snail generations, though equilibrium may be reached only at longer time scales
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Naturalis | |
| Schilthuizen, M.. |
| I made use of the known dates of reclamation (and of afforestations) in the IJsselmeerpolders in The Netherlands to assess evolutionary adaptation in Cepaea nemoralis. At 12 localities (three in each polder), I sampled a total of 4390 adult individuals in paired open and shaded habitats, on average 233m apart, and scored these for genetic shell colour polymorphisms. The results show (highly) significant differentiation at most localities, although the genes involved differed per locality. Overall, though, populations in shaded habitats had evolved towards darker shells than those in adjacent open habitats, whereas a 'Cain & Sheppard' diagram (proportion yellow shells plotted against ‘effectively unbanded’ shells) failed to reveal a clear pattern. This... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Predation; Crypsis; Contemporary evolution; Gastropoda; Mollusca; Adaptation; 42.73. |
| Ano: 2013 |
URL: http://www.repository.naturalis.nl/record/445782 |
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| Schilthuizen, M.; Gravendeel, B.. |
| Left-right asymmetry patterns in the body shapes of animals and plants have been a continuous source of interest among biologists. Recently, inroads have been made to developing a coherent research programme that makes use of the unique fact that chiral patterns may be studied (and generalities deduced) by comparisons across many unrelated groups, even across Kingdoms. The papers delivered at the symposium ‘Evolution of Chirality’ during the 2011 European congress of evolutionary biology (ESEB) provide examples of the various research programs that are currently developing within this field. The present paper provides a summary of the symposium, an introduction to this Special Issue of Contributions to Zoology, as well as suggestions for further... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Chirality; Development; Evolution; Evo-devo; 42.21. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/419170 |
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| Schilthuizen, M.; Perreau, M.. |
| This paper aims to fill some gaps in the taxonomic knowledge of the genus Ptomaphaginus for the Sunda region (in insular and peninsular Southeast Asia). We have refrained from a full regional revision. However, we present new distribution records for the following previously described species: Ptomaphaginus murphyi Szymczakowski, 1970 (Malaysia); P. rufus Jeannel, 1936 (Malaysia); P. tarsalis Szymczakowski, 1964 (Sumatra); P. aff. scaphaner Szymczakowski, 1972 (Malaysia, Java); P. sinuatus Schilthuizen, 1984 (Java); P. baliensis Perreau, 1995 (Sumatra). We also name 12 new species: P. anas spec. nov. (Malaysia); P. bryantioides spec. nov. (Borneo); P. caroli spec. nov. (Borneo), P. similipes spec. nov. (Borneo); P. kinabaluensis spec. nov. (Borneo); P.... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Cholevidae; Catopidae; Cholevinae; Genitalia; Speciation; Malaysia; Indonesia; Singapore; New species; 42.75. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/261779 |
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| Schilthuizen, M.. |
| Background: Many groups of land snails show great interspecific diversity in shell ornamentation, which may include spines on the shell and flanges on the aperture. Such structures have been explained as camouflage or defence, but the possibility that they might be under sexual selection has not previously been explored. Presentation of the hypothesis: The hypothesis that is presented consists of two parts. First, that shell ornamentation is the result of sexual selection. Second, that such sexual selection has caused the divergence in shell shape in different species. Testing the hypothesis: The first part of the hypothesis may be tested by searching for sexual dimorphism in shell ornamentation in gonochoristic snails, by searching for increased... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Mollusca; Land snails; Sexual selection; Shells; Diversity; 42.73. |
| Ano: 2003 |
URL: http://www.repository.naturalis.nl/record/224794 |
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| Schilthuizen, M.. |
| The great diversity in genital shape and function across and within the animal phyla hamper the identification of specific evolutionary trends that stretch beyond the limits of the group under study. Asymmetry might be a trait in genital morphology that could play a unifying role in the evolutionary biology of genitalia. Here, I review the current knowledge on the taxonomic distribution, phylogenetic patterns, genetics, development, and ecology of asymmetric (chiral) genitalia. Asymmetric genitalia (male as well as female) have evolved from bilaterally symmetric ones (and sometimes vice versa), innumerous times in most animal taxa with internal fertilisation, and especially in Platyhelminthes, Arthropoda, Nematoda, and Chordata. In groups with asymmetric... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Chirality; Development; Enantiomorphs; Morphology; Sexual selection; Symmetry; 42.73. |
| Ano: 2013 |
URL: http://www.repository.naturalis.nl/record/445874 |
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| Njunjić, I.; Perreau, M.; Hendriks, K.; Schilthuizen, M.; Deharveng, L.. |
| The subtribe Anthroherponina form an iconic group of obligate cave beetles, typical representatives of the Dinaric subterranean fauna, which is considered to be the richest in the world. Phylogenetic studies within this subtribe are scarce and based only on morphological characters, which, due to troglomorphic convergence, are frequently unreliable. Moreover, morphological stasis and morphological polymorphism make classification of taxa difficult. To test if characters that have traditionally been accepted as informative for Anthroherponina classification are indeed reliable, we evaluated the monophyly of the most speciesrich genus of this subtribe - Anthroherpon Reitter, 1889. Our study, based on a molecular phylogenetic analysis of fragments of the 18S,... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Coleoptera; Convergent evolution; Dinaric Mountains; Morphometrics; Troglobites. |
| Ano: 2016 |
URL: http://www.repository.naturalis.nl/record/614732 |
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| Schilthuizen, M.; Haase, M.; Koops, K.; Looijes, S.M.; Hendrikse, S.. |
| The Southeast-Asian tree snail subgenus Amphidromus s. str. (Gastropoda Pulmonata: Camaenidae) is unusual among all gastropods for its genetic antisymmetry: populations consist of stable mixtures of individuals with clockwise (dextral) and counterclockwise (sinistral) coiling directions. Although previous studies in A. inversus suggest that this genetic dimorphism is maintained by sexual selection, it cannot be ruled out that environmental factors also play a role. Adult shell shapes in A. inversus are known to show subtle differences between both coiling morphs, and it is known that in snails in general, shell shape is under environmental selection, thus creating the possibility that micro-niche use of both coiling morphs differs. In this paper, we first... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Dispersal; Gastropoda; Left-right-asymmetry; Mollusca; Niche-differentiation; Southeast-Asia; 42.73. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/419173 |
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| Registros recuperados: 14 | |
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