Wijnand Heitmans

Leiden University | LEI · Institute of Biology Leiden

We confirm the presence of the widespread hematopha- geous slug mite Riccardoella oudemansi new to the Canary Islands. The slug mite was discovered on two endemic gas- tropods: the semi-slug Insulivitrina solemi on La Palma and the true glass snail Retinella hierroensis on El Hierro. Evidence is provided that the mite can reproduce on both hosts. I...

Maintaining reptiles in captivity can give clues about their longevity. As expected, longevities in captivity have increased with the development of better care and husbandry; the first reports on reptiles life spans achieved in zoological gardens are shorter than those reported in more recent studies. Herein, we recount the remarkably 41 year life...

Dutch Chalcididae in collection or on photo?

A plot/cage experiment where a natural arthropod fauna in a pristine meadow was exposed to a range of 12 concentrations of an insecticide (chlorpyrifos) enabled us to calculate significant dose response regressions for over 60 taxa. This information was used to derive SSD’s (Species Sensitivity Distributions) for the major classes of arthropods (mi...

Tetrastichus brachyopae is reported as new to the Netherlands from De Kaaistoep, a nature reserve close to the city of Tilburg (province of Noord-Brabant) and not far from the Belgium border. This eulophid wasp is exclusively known as natural enemy of hoverflies of the genus Brachyopa. The hoverfly larvae develop in sap runs, mostly of various deci...

A chapter about the bee-genus Sphecodes written by Jeroen de Rond in the book about Apidae s.l. in the Netherlands (Peeters et al. 2012). You can download this book for free on https://www.bestuivers.nl/publicaties/de-nederlandse-bijen

THE DUTCH BEES (HYMENOPTERA: APIDAE S.L.) In the Netherlands, 358 species of bees have been recorded. The knowledge of their distribution and biology has greatly improved over recent years, thanks to hundreds of people who contributed their observations. This book attempts to present the accumulated knowledge on the Dutch bees in an attractive fash...

Overview of all Sphecodes species ever recorded from the Netherlands. A detailed description of habitus, distribution and biology is given for the genus and for each species (in Dutch language only).

This paper aims at modelling the spatial distribution of the cockroach species Capraiellus panzeri, Ectobius lapponicus, Ectobius pallidus and Ectobius sylvestris within the Netherlands and comparing the habitat preferences of these species. Maxent was used to calculate habitat suitability and to identify environmental variables underlying the diff...

Overview of the parasitoid wasp family Bethylidae in The Netherlands. A summary of the present knowledge is given on distribution, habitat, biology and taxonomy of the species found in this country since the end of the Nineteenth Century (Dutch language only).

The aculeate wasps and ants of the Netherlands The wasps en ants (Hymenoptera Aculeata excusive of the Apidae) constitute a significant portion of the Dutch fauna comprising in all some 469 species. This book gives a general account in the Dutch language of the current knowledge of the ecology, behaviour, evolutionary history, diversity, threats an...

THE ACULEATE WASPS AND ANTS OF THE NETHERLANDS The wasps en ants (Hymenoptera Aculeata excusive of the Apidae) constitute a significant portion of the Dutch fauna comprising in all some 469 species. This book gives a general account in the Dutch language of the current knowledge of the ecology, behaviour, evolutionary history, diversity, threats an...

Bethylid wasps are a medium sized family of parasitic Hymenoptera, with biological control potential, which have recently proved excellent model systems for testing evolutionary and life history theory. We report observations on a species of Laelius from The Netherlands. The species is morphologically indistinguishable from Laelius pedatus, previou...

Metoecus paradoxus in predominantly a parasitoid of Vespula vulgaris, but has a wide range of host species. Before 1966 there were only three records of this northern Palaearctic species from The Netherlands, but during the last three decades the beetle was present in ten of the twelve Dutch provinces. The beetle occurs in various rural and urban e...

The Palaearctic Rhipiphoridae of Western Europe are listed for The Netherlands and the surrounding countries. Triungulin larvae close to the species of Macrosiagon ferrugineum are reported as new to the Dutch fauna. The phoretic association with Nitela borealis (Sphecidae), Chrysis angustula and Trichrysis cyanea (Chrysididae) in nature has not bee...

The Palaearctic Rhipiphoridae of Western Europe are listed for The Netherlands and the surrounding countries. Triungulin larvae close to the species Macrosiagon ferrugineum are reported as new to the Dutch fauna. The phoretic association with Nitela borealis (Sphecidae), Chrysis angustula and Trichrysis cyanea (Chrysididae) in nature has not been r...

Rate of development and reproduction of Orius vicinus was measured on different sorts of animal prey and on Vicia fabae pollen. Several phytophagous and predacious mites proved to be good prey species for the predator, but some small insects, such as Typhlocyba sp. and Aphis pomi were less suitable. Reproduction on a diet of Vicia fabae pollen was...

Examination of recently collected material of the mailed catfish genus Lasiancistrus Regan, 1904, from French Guiana and Surinam revealed L. niger (Norman, 1926), and two new species: L. brevispinis and L. longispinis . The three species are described and figured. Lasiancistrus is compared with 13 other genera, forming the tribe Ancistrini of the s...

The chromosome numbers have been assessed for 31 bisexual species of 14 different genera of the Tetranychidae, bringing the total of karyotyped species in this family to 109. The taxonomic significance of karyotype information is discussed. A haploid number of n=5 occurs in Neotrichobia arizonensis, Eotetranychus fremonti and E. gambelii; of n=4 in...

The chromosome numbers and types of parthenogenesis have been assessed for 19 species of 6 different genera of the Tenuipalpidae. The modal number of n = 2 is found to occur in species of the genera Aegyptobia, Cenopalpus, Brevipalpus, Dolichotetranychus and Raoiella. The bisexual species examined exhibit haplo-diploidy (with n = 2 and 2n = 4) as a...