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Hofheim am Taunus, Germany

Metzeltin D.,Am Stegskreuz 3b | Tremarin P.I.,Federal University of Parana
Iheringia - Serie Botanica | Year: 2011

The study of periphytic material sampling in the Atlantic Rainforest of Southeast Brazil revealed the occurrence of a new species, Eunotia fuhrmannii sp. nov., found in humid rocks associated to Sphagnum L. The taxon has strongly dorsiventral valve with a median ridge, rounded to cuneate-obtuse apex, prominent polar nodules, spaced striae in the middle, and shortened at the junction of valve face with the mantle. E. fuhrmannii distinguished from similar species, as E. prolongata var. simplex Hustedt e E. brinkmannii Metzeltin & Lange-Bertalot, mainly by the shape of valve ends, density of striae, position of polar nodules and shape of terminal raphe fissures. Source


Gong Z.,CAS Nanjing Institute of Geography and Limnology | Metzeltin D.,Am Stegskreuz 3b | Li Y.,CAS Nanjing Institute of Geography and Limnology | Edlund M.B.,St. Croix Research
Phytotaxa | Year: 2015

Three new freshwater diatoms are described from China’s Yunnan Plateau region in sediments from Lakes Fuxian, Erhai, and Lugu. Navicula craticuloides, nov. sp., N. gongii, nov. sp. and N. yunnanensis, nov. sp. were identified from light and scanning electron micrographs. The main features of N. craticuloides are its valve outline with rounded ends, a narrowlateral raphe, hooked terminal fissures, a linear axial area, a rectangular central area, and wavy striae towards the margins. The main features of N. gongii are narrowly lanceolate valves with long-protracted ends, a lateral raphe, a slightly curved axial area, and a rhombic or transversely expanded central area. The main features of N. yunnanensis are lanceolate valves with triundulate margins and cuneate ends and a lateral raphe. The new species have so far been found mainly in surficial sediment. ©2015 Magnolia Press Source


Li Y.,CAS Nanjing Institute of Geography and Limnology | Kociolek J.P.,University of Colorado at Boulder | Metzeltin D.,Am Stegskreuz 3b
Diatom Research | Year: 2010

This paper describes two new Gomphonema species from the southern Sichuan Province, China, and shows their valve morphology using light and scanning electron microscopy. The two species, Gomphonema sichuanensis sp. nov. and G. heilongtanensis sp. nov., were found in Lake Dashuicao and Lake Heilongtan. Main features of G. sichuanensis are clavate valves, broadly rounded headpole, narrowly rounded footpole, narrow axial area, indistinct central area, undulate and distinctly lateral raphe, clearly separated stigma from stria, and slightly radiate striae. Main features of G. heilongtanesis are clavate valves with wedge-shaped, acutely rounded headpole and narrowly rounded footpole, narrow axial area, small rounded central area, and parallel striae in the valve center becoming slightly radiate towards the apices. Despite a long history of research on freshwater diatoms in China, there is still much work to do to document the flora of this large and geographically complex country. Source


Li Y.,CAS Nanjing Institute of Geography and Limnology | Li Y.,Natural History Museum in London | Williams D.M.,Natural History Museum in London | Metzeltin D.,Am Stegskreuz 3b | And 2 more authors.
Journal of Phycology | Year: 2010

Tibetiella pulchra Y. L. Li, D. M. Williams et Metzeltin is described from River Nujiang. Its main features are heteropolar valves, which are linear with capitate ends; narrow sternum, expanding at its center; 2-5 rimoportulae at each apex; uniseriate striae; two short projections arising on the surface above each apical pore plate; and an ocellulimbus, extending from the edge of the valve margin to the edge of the valve surface. Of these characters, it is defined by the 2-5 rimoportulae at each apex. T. pulchra was common to abundant on rocks in the samples examined herein. © 2009 Phycological Society of America. Source


Gong Z.,CAS Nanjing Institute of Geography and Limnology | Li Y.,CAS Nanjing Institute of Geography and Limnology | Metzeltin D.,Am Stegskreuz 3b | Lange-Bertalot H.,Goethe University Frankfurt | Lange-Bertalot H.,Senckenberg Institute
Phytotaxa | Year: 2013

This paper describes five new Cymbella, one new Cymbopleura and one new Placoneis species from the late Pleistocene of the Jianghan Plain in China, based on light-and scanning electron microscopy of valve morphology. The characteristic morphological features of the seven new species differ from known established taxa by valve shape, both the central portion and apices, length/breadth ratio, shape of the central area and presence or absence of stigmata. All six cymbelloid taxa are as yet found only in fossil deposits of the Jianghan Plain. The Placoneis species, however is apparently conspecific with an extant population observed in Northern Myanmar (Burma, Southeast Asia). © 2013 Magnolia Press. Source

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