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	Provedor de dados Naturalis (4) Autor Koenemann, Stefan (4) Ham, Joris van der (1) Holsinger, John R. (1) Hou, Zhong-E (1) Iliffe, Thomas M. (1) Li, Shuqiang (1) Schram, Frederick R. (1) Mais... Palavra-chave Amphipoda (2) Biogeography (2) New species (2) Anchihaline caves (1) Bahamas (1) China (1) Cladistic analysis (1) Crustacea (1) Event pairs (1) Evolutionary history (1) Gammarus (1) Groundwater (1) Heterochrony (1) Neighbor joining (1) Ontogeny (1) Parsimony (1) Phylogenetic methodology (1) Phylogenetic reconstruction (1) Remipedia (1) Sequence data (1) Mais... Tipo do documento Article / Letter to the editor (4) Ano 2003 (1) 2002 (2) 2001 (1) País Netherlands (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Three new sympatric species of Remipedia (Crustacea) from Great Exuma Island, Bahamas Islands Naturalis Koenemann, Stefan; Iliffe, Thomas M.; Ham, Joris van der. Three new sympatric species of remipede crustaceans, Speleonectes tanumekes, Speleonectes parabenjamini and Speleonectes minnsi, are described from an anchihaline cave on Great Exuma Island in the central Bahamas. Speleonectes tanumekes is a comparatively long and slender species distinguished by the largest number of trunk segments found in remipedes to date. Speleonectes parabenjamini is morphologically closely related to Speleonectes benjamini, but differs from the latter species by several distinct autapomorphies. Speleonectes minnsi is characterized by comparatively robust maxillules. The occurrence of three sympatric species is a remarkable record for the Remipedia adding to a total of 10 sympatric taxa. We discuss the high diversity of remipedes in... Tipo: Article / Letter to the editor Palavras-chave: Crustacea; Remipedia; Speleonectidae; Speleonectes; New species; Bahamas; Anchihaline caves; Sympatry; Biogeography; Evolutionary history. Ano: 2003 URL: http://www.repository.naturalis.nl/record/534285 The limitations of ontogenetic data in phylogenetic analyses Naturalis Koenemann, Stefan; Schram, Frederick R.. The analysis of consecutive ontogenetic stages, or events, introduces a new class of data to phylogenetic systematics that are distinctly different from traditional morphological characters and molecular sequence data. Ontogenetic event sequences are distinguished by varying degrees of both a collective and linear type of dependence and, therefore, violate the criterion of character independence. We applied different methods of phylogenetic reconstruction to ontogenetic data including maximum parsimony and distance (cluster) analyses. Two different data sets were investigated: (1) four simulated ontogenies with defined phylogenies of six hypothetical taxa, and (2) a set of “real” data comprising sequences of 29 ontogenetic events from 11 vertebrate taxa.... Tipo: Article / Letter to the editor Palavras-chave: Ontogeny; Heterochrony; Event pairs; Vertebrate development; Sequence data; Phylogenetic methodology; Parsimony; Neighbor joining. Ano: 2002 URL: http://www.repository.naturalis.nl/record/534322 Systematics of the North American subterranean amphipod genus Bactrurus (Crangonyctidae) Naturalis Koenemann, Stefan; Holsinger, John R.. Bactrurus Hay is a relatively small generic group that inhabits caves and related groundwater habitats in parts of eastern and central USA. Two field trips, conducted in the spring of 1999, yielded important new locality records that give us a better knowledge of the distribution of the genus. The examination of fresh samples as well as older collection material has resulted in descriptions of four new species. Based on these descriptions and redescriptions of three previously known species, the taxonomy of the genus is revised. In addition, a phylogenetic analysis using morphological data is employed to examine the relationship of Bactrurus to 12 selected crangonyctid taxa, including its potential sister genus Stygobromus Cope. Five epigean and hypogean... Tipo: Article / Letter to the editor Palavras-chave: Biogeography; Vicariance; Phylogenetic reconstruction; Taxonomic revision; Cladistic analysis; Groundwater; Stygobiont; Amphipoda. Ano: 2001 URL: http://www.repository.naturalis.nl/record/504698 Gammarus emeiensis, a new species of amphipod crustacean from Sichuan Province, China Naturalis Hou, Zhong-E; Li, Shuqiang; Koenemann, Stefan. Specimens of a new species of gammarid Amphipoda, Gammarus emeiensis n. sp., were found on Emei Mt., Sichuan Province, China. A detailed description of this freshwater amphipod is given and differences to related species are discussed. Tipo: Article / Letter to the editor Palavras-chave: Amphipoda; Gammarus; New species; China. Ano: 2002 URL: http://www.repository.naturalis.nl/record/504855 Registros recuperados: 4 Primeira ... 1 ... Última

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