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| Sluys, Ronald; Kawakatsu, Masaharu. |
| An account is given of 13 species of freshwater planarians from the family Dugesiidae, based on samples from new localities in New Zealand and Australia; these include four newly described and one problematic species. In the case of three species, the material described represents the second series of specimens available since the material used in the original descriptions of these species, as a result of which our understanding of the morphology of the animals can be expanded. In other cases, the new material also contributed to a more detailed understanding of the anatomy of the species. The study concludes with detailed distribution maps for the species examined, including not only the new distributional records described in the paper but also... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Platyhelminthes; Dugesiidae; Australia; New Zealand; Taxonomy; Biogeography. |
| Ano: 2001 |
URL: http://www.repository.naturalis.nl/record/504748 |
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| Sluys, Ronald. |
| Many of the lower metazoans reach adulthood via complex developmental stages. Each of these stages is described with a specialized terminology, which is different for every major group of organisms. Biologists with a proper training in biodiversity may have learned about these complex issues during their undergraduate days, but many of us do no longer encounter the intricacies of lower metazoan development in later stages of our careers. We may be familiar with the ontogenetic stages in the group on which we specialize, but only a few will have practical knowledge and an overview of the larval stages in such groups as crustaceans, echinoderms, polychaetes, sipunculans, molluscs, flatworms, bryozans, and nemertines. Donald Williamson certainly belongs to... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Ontogeny; Larvae; Evolutionary theory; Parallelism; Homology. |
| Ano: 1992 |
URL: http://www.repository.naturalis.nl/record/504508 |
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| Sluys, Ronald. |
| The breeding distribution of the Bearded Tit Panurus biarmicus is not disjunct but continuous from western Europe to Manchuria (fig. 4). Colour variation allows for the partition in a group of light populations, a group of dark populations, and an extra dark population (fig. 5). The range of the dark group is disjunct. With respect to the amount of streaking on head and back of females, three groups could be distinguished (fig. 6). The so-called “variable group” coincides with the dark colour group, except for Greece and the Caucasus, and the “not variable group” coincides with the light colour group. The marking of individual mantle feathers in females shows no essential differences between populations. The marking of the outermost tail-feather shows... |
| Tipo: Article / Letter to the editor |
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| Ano: 1983 |
URL: http://www.repository.naturalis.nl/record/504483 |
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| Sluys, Ronald. |
| 1. A phylogenetic hypothesis for the triclads is presented and the characters on which it is based are discussed. 2. The sister group of the Tricladida is formed by the Bothrioplanida, and together the two taxa share a sistergroup relationship with the Proseriata. 3. The monophyletic status of the suborder Tricladida is supported by several derived features (Fig. 1., characters 9—12), including a unique embryological development and the presence of a marginal adhesive zone. 4. It is postulated that the Maricola is the primitive sister group of the Terricola and the Paludicola together and that the Paludicola represents the most advanced group within the Tricladida. Characters supporting these hypotheses are discussed (Fig. 1, characters 14-16, and 20-22,... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Plathyhelminthes; Tricladida; Phylogeny. |
| Ano: 1989 |
URL: http://www.repository.naturalis.nl/record/504601 |
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| Sluys, Ronald. |
| SLUYS, R., 1992. Synopsis of the freshwater triclads of the Caribbean (Platyhelminthes, Tricladida, Paludicola). Studies Nat. Hist. Caribbean Region 71, Amsterdam, 1992: 1-23. An account is given of the five species of freshwater triclads which are known from the Caribbean region, including taxonomic descriptions, karyological, ecological, and biogeographic information, supplemented with remarks on observations of previous workers and comparisons with similar species. Records of unidentified specimens are summarized. Caribbean freshwater planarians belong to the genus Girardia; the phylogenetic relationships within this genus remain to be resolved. It is argued that present distributional patterns in Caribbean Girardia’s may be the result of vicariance... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Girardia; Biogeography.; Phylogeny; Caribbean; Taxonomy; Tricladida; Platyhelminthes; Paludicola. |
| Ano: 1992 |
URL: http://www.repository.naturalis.nl/record/503170 |
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| Sluys, Ronald. |
| A new species of marine triclad, Ectoplana undata n. sp., ectoparasitic on the horseshoe crab Tachypleus gigas, is described. Cocoons of triclads were found on T. gigas as well as on the horseshoe crab Carcinoscorpius rotundicauda; since from the latter species no triclads were collected, it remains unknown whether these cocoons are those of E. undata or of another species. The genus Ectoplana, though poorly defined, is here retained, for stated reasons, pending a revision of the Procerodidae. |
| Tipo: Article / Letter to the editor |
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| Ano: 1983 |
URL: http://www.repository.naturalis.nl/record/504617 |
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