Naturalis Biodiversity Center Section

Leiden, Netherlands

Naturalis Biodiversity Center Section

Leiden, Netherlands
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Hoekstra P.H.,Naturalis Biodiversity Center Section | Hoekstra P.H.,Wageningen University | Wieringa J.J.,Naturalis Biodiversity Center Section | Wieringa J.J.,Wageningen University | Chatrou L.W.,Wageningen University
PhytoKeys | Year: 2016

As part of an ongoing revision of the genus Monanthotaxis Baill. (Annonaceae), nine new species are described and one variety is reinstated to species rank. Two new species from West Africa (Monanthotaxis aquila P.H. Hoekstra, sp. nov. and Monanthotaxis atewensis P.H. Hoekstra, sp. nov.), four new species from Central Africa (Monanthotaxis couvreurii P.H. Hoekstra, sp. nov., Monanthotaxis latistamina P.H. Hoekstra, sp. nov., Monanthotaxis tripetala P.H. Hoekstra, sp. nov. and Monanthotaxis zenkeri P.H. Hoekstra, sp. nov.), one new species from Tanzania (Monanthotaxis filipes P.H. Hoekstra, sp. nov.), one new species from the area around Maputo (Monanthotaxis maputensis P.H. Hoekstra, sp. nov.), one new species from the Comoro Islands (Monanthotaxis komorensis P.H. Hoekstra, sp. nov.) and Monanthotaxis klainei (Engl.) Verdc. var. angustifolia (Boutique) Verdc. is raised to species level leading to the replacement name Monanthotaxis atopostema P.H. Hoekstra, nom. nov. (not Monanthotaxis angustifolia (Exell) Verdc.). Complete descriptions, comparisons with related species, ecological information and IUCN conservation assessments are given for the new species. Five species were classified as critical endangered, two species as endangered, one as vulnerable and one as least concern, warranting the need of further collecting and studying those species. © Paul H. Hoekstra et al.

Guo X.,University of Hong Kong | Hoekstra P.H.,Wageningen University | Hoekstra P.H.,Naturalis Biodiversity Center Section | Tang C.C.,University of Hong Kong | And 6 more authors.
Taxon | Year: 2017

Friesodielsia and the closely related genera Dasymaschalon, Desmos, Exellia, Gilbertiella and Monanthotaxis (Annonaceae subfamily Annonoideae tribe Uvarieae) are taxonomically problematic, with obscure generic delimitations and poorly known phylogenetic relationships. The present study addresses the polyphyletic status of Friesodielsia, using two nuclear and five chloroplast DNA regions to resolve this taxonomic confusion by circumscribing strictly monophyletic genera across the tribe. Bayesian, maximum likelihood and maximum parsimony analyses using a broad taxon sampling (101 taxa) reveal that Friesodielsia species form five robust and morphologically distinct clades. In order to ensure strict monophyly of genera, we restrict the generic name Friesodielsia to an exclusively Asian clade, and the African species that were formerly included in the genus are transferred to Afroguatteria, Monanthotaxis and Sphaerocoryne, necessitating ten new nomenclatural combinations. Schefferomitra, a monospecific genus from New Guinea, is shown to be congeneric with Asian Friesodielsia, and the nomenclatural implications of this are discussed. Two monospecific genera, Exellia and Gilbertiella, are furthermore synonymised with Monanthotaxis, necessitating two additional nomenclatural changes. New generic descriptions are provided for Dasymaschalon (ca. 27 species), Desmos (ca. 22 species), Friesodielsia (ca. 38 species) and Monanthotaxis (ca. 94 species) to reflect these revised circumscriptions. © International Association for Plant Taxonomy (IAPT) 2017.

A new species of the genus Dugesia from the Amatola Mountains in the Eastern Province of South Africa is described, including a karyological account and notes on its life cycle and reproductive modes. The new species differs from its congeners in a unique combination of morphological characters of the copulatory apparatus, in particular the central course of the ejaculatory duct with its terminal opening at the tip of the penis papilla, the elongated seminal vesicle, the asymmetrical openings of the oviducts into the bursal canal, and the openings of vasa deferentia at about halfway along the seminal vesicle. In addition, an overview is provided of all freshwater triclads reported from the African continent including karyological information and notes on reproductive modes. Copyright © 2012 · Magnolia Press.

Van Velzen R.,Wageningen University | Van Velzen R.,Naturalis Biodiversity Center section | Wahlert G.A.,University of Utah | Sosef M.S.M.,Wageningen University | And 2 more authors.
Systematic Botany | Year: 2015

Rinorea is a pantropical genus of shrubs and small trees within the family Violaceae. The genus is particularly diverse in Africa where species are ecologically important as they are often abundant or even dominant in particular forest types and act as larval host plants for highly specialized Cymothoe butterflies. Despite their importance, species identification of African Rinorea is difficult and a taxonomic revision is needed. Previous phylogenetic studies have suggested that neotropical taxa are sister to a palaeotropical clade, with multiple independent dispersals to Madagascar, but these were based on plastid data only. We therefore present an updated phylogeny of Rinorea with increased sampling of African taxa, using plastid as well as nuclear DNA sequences. Phylogenetic relationships inferred from nuclear DNA data were generally congruent with those based on evidence from plastid haplotypes from earlier studies. Our increased taxonomic sampling also revealed previously undiscovered African Rinorea clades, some of which warrant further taxonomic study. Ancestral state reconstructions refute previous hypotheses about the evolution of morphological characters traditionally used for Rinorea infrageneric classification. In addition, some widespread species may comprise species complexes. It is clear that African Rinorea require comprehensive taxonomic revision; our contribution to understanding Rinorea infrageneric relationships will facilitate this task. © 2015 by the American Society of Plant Taxonomists.

Liu H.-M.,Chinese Academy of Sciences | Jiang R.-H.,CAS Institute of Botany | Guo J.,Harbin Normal University | Hovenkamp P.,Naturalis Biodiversity Center section | And 5 more authors.
Taxon | Year: 2013

We inferred the classification of the Paleotropical climbing fern genus Arthropteris and its close relative Psammio-sorus, a monotypic genus endemic to Madagascar. The classification of these ferns has until now been poorly understood. To address this, we sampled more than half of the species diversity covering the whole range of the genus including the outlying occurrence at the Juan Fernández Islands. To reconstruct phylogenetic relationships, we obtained DNA sequences from up to six plastid genome regions, including coding and non-coding regions, for these two genera and representatives of all families of the eupolypod I clade, with an emphasis on the Tectariaceae. These data were analyzed using maximum parsimony, maximum likelihood, and Bayesian inference. We also obtained divergence time estimates. Three questions were addressed. (1) We established that Arthropteris and Psammiosorus form a well-supported clade representing a separate taxon based on their morphological distinctiveness, phylogenetic relationships, and separation since the Eocene from other accepted families of eupolypod ferns. (2) Psammiosorus was found to be nested within Arthropteris. (3) Our analyses supported recognition of a previously doubted species endemic to the karst regions of southern China and northern Vietnam. As a consequence of our results, we describe the new family Arthropteridaceae and introduce the new combination Arthropteris paucivenia for the Madagascan endemic previously treated under Psammiosorus.

Wieringa J.J.,Naturalis Biodiversity Center section | Wieringa J.J.,Wageningen University | Mackinder B.A.,Herbarium | Mackinder B.A.,Tropical Diversity Group | And 2 more authors.
Phytotaxa | Year: 2013

A new genus, Gabonius is described to accommodate a single species, Gabonius ngouniensis which was previously misplaced in Hymenostegia sensu lato. Gabonius ngouniensis is a widespread Gabonese endemic of evergreen forest. We assess G. ngouniensis as Least Concern (LC) according to IUCN criteria. A distribution map of Gabonius is presented, as is a table comparing the morphology of Gabonius, the closely related, possibly sister genus Micklethwaitia and Hymenostegia sensu stricto from which G. ngouniensis has been excluded. The previously unreported seedling morphology is discussed. © 2013 Magnolia Press.

Montesinos Tubee D.B.,Wageningen University | Montesinos Tubee D.B.,Naturalis Biodiversity Center section
Phytotaxa | Year: 2013

As part of the botanical and phytosociological characterisation of the Moqueguan flora, several Caryophyllaceae were studied. A specimen that was collected from the Ubinas district is named Paronychia ubinensis (Caryophyllaceae: Paronychioideae) and described as a new species. This species is compared with its closest relatives P. andina, P. mandoniana, P. muschleri, P. peruviana and P. weberbaueri from Southern Peru. © 2013 Magnolia Press.

van Valkenburg J.L.C.H.,National Reference Center | Duistermaat H.,Naturalis Biodiversity Center section | Boer E.,National Reference Center | Boer E.,Naturalis Biodiversity Center section
EPPO Bulletin | Year: 2013

For several years work has been ongoing to compile information to facilitate the identification of non-native plants that (potentially) pose a threat to the biodiversity of the ecozone comprising Northern Germany, the Netherlands, Belgium and North-Western France. Such identification information may also be used for species that are regulated by other countries and are likely to be present as contaminants in commercial exports originating from the Netherlands. This information system comprises a set of interactive image-driven identification keys for invasive plants at various growth stages for use in a range of different situations: seed contaminants in bird feed, weeds in bonsai plants, seedling identification, identification keys of invasive terrestrial plants and invasive aquatic plants. The advantage of image-driven identification keys using a multiple entry system lies in limiting misunderstandings in terminology and failure in identification, in the absence of certain characters, as is sometimes the case in dichotomous keys. The interactive keys are linked to the species information in the Q-bank database, including datasheets, worldwide distribution maps, specimen level information, barcodes of selected species, etc. This information is now available at © 2013 The Authors. Journal compilation © 2013 OEPP/EPPO.

Van Velzen R.,Wageningen University | Van Velzen R.,Naturalis Biodiversity Center section | Wieringa J.J.,Wageningen University | Wieringa J.J.,Naturalis Biodiversity Center section
Phytotaxa | Year: 2014

Rinorea calcicola, endemic to south-eastern Gabon, is described as a new species. Its most striking characteristic is the laminate fruit, a character so far only known for R. zenkeri. Rinorea calcicola has a limited distribution and appears to be restricted to limestone outcroppings. We have assessed it as endangered-EN B1ab(ii, iii, iv, v)-according to IUCN criteria. Morphological affinities of R. calcicola are discussed, and a key to R. zenkeri and the Gabonese species of Rinorea with textured fruits is given. The new species is one of many endemic species from the same region, and we recommend that a study of their distribution and ecology is undertaken to inform conservation planning. Because of the presence of so many narrow endemic species in the region, we suggest that the area be considered for protected status. © 2014 Magnolia Press.

van der Burgt X.M.,Herbarium | Mackinder B.A.,Herbarium | Wieringa J.J.,Naturalis Biodiversity Center section | Wieringa J.J.,Wageningen University | de la Estrella M.,University of Montréal
Kew Bulletin | Year: 2015

The Gilbertiodendron ogoouense species complex consists of 14 tree species. Eight species are here newly described and one is here reinstated: G. bambolense Burgt; G. breteleri Burgt; G. ebo Burgt & Mackinder; G. ecoukense (Pellegr.) Burgt; G. maximum Burgt & Wieringa; G. minkebense Burgt & Estrella; G. quinquejugum Burgt; G. scutatum Wieringa & Estrella and G. sulfureum Burgt. Five species in the complex were already recognised as accepted: G. brachystegioides (Harms) J. Léonard; G. klainei (Pierre ex Pellegr.) J. Léonard; G. newberyi Burgt; G. ngouniense (Pellegr.) J. Léonard and G. ogoouense (Pellegr.) J. Léonard. All 14 species are medium-sized or large trees of evergreen rain forest on well-drained or periodically inundated soil, at 0 – 900 m altitude. Each of the 14 species is distributed in one or more of the following Central African countries: Cameroon, Equatorial Guinea, Gabon, Congo (Brazzaville), Angola (Cabinda) and Congo (Kinshasa). Included are a key, a table comparing the main morphological characters, illustrations drawn to the same scale and distribution maps of all species. The conservation status of all species is assessed according to IUCN categories and criteria: G. maximum is classified as Critically Endangered, G. ebo and G. newberyi as Endangered, G. breteleri, G. klainei, G. minkebense, G. ngouniense and G. scutatum as Vulnerable, and the remaining six species as Least Concern. © 2015, The Board of Trustees of the Royal Botanic Gardens, Kew.

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