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Gassmann D.,National Center for Biodiversity Naturalis
International Journal of Odonatology | Year: 2011

Pseudagrion lorenzi sp. nov. is described from New Britain island, Papua New Guinea. Male and female characters are illustrated by means of scanning electron microscopy.A differential diagnosis with Pseuda-grion civicum Lieftinck, 1932 from New Guinea and Pseudagrion incisurum Lieftinck, 1949 from the Solomon Archipelago is provided. The female of P. incisurum is described for the first time. © 2011 Worldwide Dragonfly Association. Source

Kustatscher E.,Naturmuseum Sudtirol | Van Konijnenburg-Van Cittert J.H.A.,National Center for Biodiversity Naturalis | Van Konijnenburg-Van Cittert J.H.A.,Netherlands and Laboratory of Palaeobotany and Palynology
Neues Jahrbuch fur Geologie und Palaontologie - Abhandlungen | Year: 2011

This is the third modern day paper on the Middle Triassic flora from Thale to be published, dealing with the ferns. Two species belong to the genus Asterotheca; Asterotheca merianii (BRONGNIART) STUR is one of the most common elements in the flora, while Asterotheca thalensis n. sp. is rarer in the assemblage. Both species yielded in situ round, pseudomonolete granulate spores. Danaeopsis marantacea (PRESL in STERNBERG) SCHIMPER is the most common fern in the Thale flora; for the first time in situ spores from this species are described. Rhacophyllum crispatum (MÜNSTER in STERNBERG) n. comb, might be the aphleboid structure belonging to Danaeopsis marantacea. Todites gaillardotii (BRONGNIART) n. comb, is here described for the first time from the Erfurt Rormation (Ladinian) of Germany. Moreover, its in situ spores are documented as well. Neuropteridium grandifolium (SCHIMPER et MOUGEOT) COMPTER is just a rare element in this flora. Clathropteris meniscioides BRONGNIART and Phlebopteris sp. from Thale are earliest representatives of these genera known so far; all three species are represented only by sterile frond fragments. Cladophlebis remota (PRESL) VAN KONIJNENBURG-VAN CITTERT et al. is relatively rare, while Cladophlebis leuthardtii LEONARDI is very rare in this flora; fertile frond fragments are still missing for both species. Ror the first time Sphenopteris schoenleiniana (BRONGNIART) PRESL in STERNBERG is represented by sterile and fertile material in the Germanic Basin. Sphenopteris vel Cladophlebis sp. A might be shade leaves of Sphenopteris schoenleiniana. Chiropteris lacerata (QUENSTEDT) RÜHLE VON LILIENSTERN is a very rare element in this flora and only represented by sterile frond fragments, in contrast to Symopteris rumpfii (SCHENK) KUSTATSCHER et al. The latter yielded in situ spores (round, trilete, smooth). ©2011 E. Schwelzerbart'sche Verlagsbuchhandlung, Stuttgart, Germany. Source

Wheeler E.A.,North Carolina State University | Jae Lee S.,Korea forest Research Institute | Baas P.,National Center for Biodiversity Naturalis
IAWA Journal | Year: 2010

Wood anatomical data for all three extant genera of the Altingiaceae and 23 of the 27 extant genera of the Hamamelidaceae were compiled in an effort to find features distinctive to genera, tribes, or subfamilies within these families. All genera studied have diffuse porous wood (except Corylopsis which tends to be semi-ring porous), vessels are predominantly solitary and narrow (< 100 (μm, usually <50 μm) and angular in outline, vessel elements are long (>800 μm) with scalariform perforation plates with average bar numbers of 9-44, intervessel pits are mainly scalariform to opposite, vessel-ray parenchyma pits are scalariform with slightly reduced borders and usually are in the square to upright marginal ray parenchyma cells, rays are heterocellular and narrow, usually 1-3-seriate. Although the wood anatomy of both families is relatively homogeneous, it is possible to key out many genera using a combination of qualitative (presence/absence and location of helical thickenings in vessel elements and fibers, crystal occurrence, axial parenchyma abundance, degree of ray heterogeneity) and quantitative features (number of bars per perforation plate and ray width). Helical thickenings are present throughout the vessel elements in three genera (Loropetalum, Altingia, Semiliquidambar) and are restricted to the vessel element tails in two genera (Corylopsis, Liquidambar). Loropetalum has helical thickenings in ground tissue fibers as well. Axial parenchyma abundance varies from scarce to relatively abundant diffuse to diffuse-in-aggregates. One clade of the tribe Fothergilleae (Distylium, Distyliopsis, Sycopsis, Shaniodendron, Parrotia, Parrotiopsis) has more abundant axial parenchyma and is characterized by narrow, usually interrupted bands of apotracheal parenchyma. Nearly exclusively uniseriate rays occur in some species of Hamamelis and in Exbucklandia, Chunia, Dicoryphe, and Fothergilla. These data on extant Altingiaceae and Hamamelidaceae not only provide information relevant for systematic, phylogenetic and ecological wood anatomy and wood identification, but also give context for reviewing the fossil woods assigned to them. A new combination is proposed for the Miocene Liquidambar hisauchii (Watari) Suzuki & Watari from Japan: Altingia hisauchii (Watari) Wheeler, Baas & Lee. Source

Donovan S.K.,National Center for Biodiversity Naturalis | Lewis D.N.,Natural History Museum in London
Proceedings of the Yorkshire Geological Society | Year: 2010

Fossil crinoids are common in the Much Wenlock Limestone Formation of the type area in Shropshire, yet remain poorly known because of their fragmentary preservation. Calceocrinid disparids are recognized from Wenlock Edge for the first time on the basis of distinctive brachial ossicles. More proximal brachials have a broad, U-shaped adoral groove and an axial canal; distal ossicles have a narrower, V-shaped adoral groove and no axial canal. What remains surprising is that the most distinctive element of the calceocrinid endoskeleton, the fused basal circlet, remains unknown from Wenlock Edge. A crinoid pluricolumnal displaying an irregular line of three pits that show a progressive increase in size was infested while the crinoid was alive; this is indicated by the swollen column and deformities of columnals. Such infestations are rare in the British Silurian. The pits may have been made by a single infesting organism which migrated up or down the column in response to the influence of gravity. © 2010 Yorkshire Geological Society. Source

Donovan S.K.,National Center for Biodiversity Naturalis | Ewin T.A.M.,Natural History Museum in London
Proceedings of the Yorkshire Geological Society | Year: 2010

A small collection of well-preserved crinoid attachment structures from the Upper Devonian Pilton Formation of north Devon indicates the presence of two distinct species. Sostronocrinus mundus (Whidborne) lived attached to an unlithified sedimentary substrate by the vertical insertion of a robust, terminal rhizoidal holdfast abetted by robust, unbranched radices oriented laterally or curved distally. There was a strong differentiation of morphology between the radicular attachment and the more proximal column, which lacked radices. Eumorphocrinus porteri (Whidborne) attached to a similar substrate by an irregularly heteromorphic, tapering radicular runner bearing branched radices that promoted permanent attachment close to the sediment surface. These radices were probably developed on at least part of the more proximal column. The highest columnals of the dististele do not bear radices and, therefore, are not nodals. The dististele was previously unknown in both of these species. © 2010 Yorkshire Geological Society. Source

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