Browsing by Author "Norris, James N."
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- Got Talent: Peyssonnelia globally showcases its skillsPublication . Gabriel, Daniela; Krayesky, David; Norris, James N.; Schmidt, William E.; Schils, Tom; Fredericq, SuzanneABSTRACT: The crust forming genus Peyssonnelia Decaisne is a taxon of great ecological importance, with some species involved in the establishment of rhodoliths. Comparative morphological and molecular analyses demonstrate a greater diversity of peyssonnelioid species than was previously reported. In chloroplast-encoded rbcL-based trees, species referred to as Peyssonnelia in the literature do not group together, but are scattered among other genera that were not currently placed in the Peyssonneliaceae. Two recently reported genera for the Gulf of Mexico, “ Polystrata” and Metapeyssonnelia, were excluded from the family, and together with a third clade are nested inside the Rhizophyllidaceae of the Dumontiaceae-complex. The Rhizophyllidaceae is newly reported for the Gulf of Mexico, with six species. The number of distinct species of Peyssonneliaceae now present in the Gulf of Mexico has increased from 6 to 21. On the other hand, the number of Peyssonnelia reported for the Azores was reduced from five to one species. Some species placed in Cruoriella and Cruoriopsis actually belong in the Peyssonneliaceae. New combinations are being proposed to accommodate known and new species in Cruoriella, and in two formerly monotypic genera, Sonderophycus and Riquetophycus. The Peyssonneliaceae forms a monophyletic assemblage that could not be maintained in the Gigartinales and thus a new order was constituted, Peyssonneliales, unrelated to the cluster of families centred around the Halymeniaceae of the Halymeniales, or the Gigartinaceae of the Gigartinales.
- New Deepwater Species Of Red Algae Growing In Rhodolith Beds In The NW Gulf Of MexicoPublication . Fredericq, Suzanne; Arakaki, Natalia; Ehrenhaus, Constanza; Norris, James N.; Richards, Joseph; Gabriel, Daniela; Sauvage, Thomas; Gurgel, Carlos Frederico Deluqui; Kittle III, Ronald Paul; Krayesky, Sherry; Schmidt, William E.This talk will focus on recently collected new species of marine red algae growing on the surface of rhodoliths at 56-85m depth in the northwestern Gulf of Mexico.
- New insights in the systematics of Peyssonnelia and the Peyssonneliaceae (Rhodophyta), with emphasis on taxa from the Gulf of Mexico and PanamaPublication . Krayesky, David; Norris, James N.; Gabrielson, Paul W.; Gabriel, Daniela; Fredericq, SuzanneABSTRACT: "Peyssonnelia Decaisne comprises a worldwide group of non-calcified or calcified, crust-forming red algae of great ecological significance, with some species involved in the establishment of rhodoliths. Of the eight genera currently recognized in the family, Peyssonnelia, is widely viewed to contain the largest number of species. The number of distinct species of Peyssonneliaceae present in the Gulf of Mexico has increased from 6 to 21. Comparative morphology, chloroplast-encoded rbcL and nuclear LSU rDNA sequence data suggest that species of Peyssonnelia do not occur in the Gulf of Mexico, and that previously reported Peyssonnelia species for the region actually belong to other genera of the Peyssonneliales." (a) University of Louisiana at Lafayette (b) Smithsonian Institution (c) University of North Carolina
- New records of marine red algae from the AzoresPublication . Fredericq, Suzanne; Serrão, Ester; Norris, James N.Registaram-se dez novas ocorrências de algas marinhas vermelhas betónicas subtidais para os Açores: Scinaia turgida, Crypronemia lomation, Grateloupia sp., Acrosymphyton purpuriferum, Predaea feldmannii, Nemastoma confusa, Schimmelmannia ornata, Corynomorpha prismática, Hypnea arbuscula e Chrysymenia bullosa. A distribuição de qualquer destas espécies está referida predominantemente para o Atlântico oriental tropical (Oeste de África) ou para o Mediterrâneo.
- The Renouxia files: the richness is out there!Publication . Gabriel, Daniela; Norris, James N.; Schmidt, William E.; Harris, D. J.; Fredericq, SuzanneABSTRACT: In 1989, a gelatinous red alga was reported for the Caribbean, to which no species name, genus, order or even family could be assigned. Renouxia antillana was finally described in 1995 and accomodated in a new order and family (Rhodogorgonales, Rhodogorgonaceae) along with Rhodogorgon ramosissima described six years earlier based on material from reefs in Belize. For more than 20 years, the genus has remained monotypic, with rare reports in the Caribbean and in the Indo-Pacific (from Malaysia to French Polynesia). Recent collections in Egypt resulted in the first record of Renouxia in the Red Sea. DNA sequence analyses indicate that the specimens belong to a new species. The cox1 pairwise distance among the Red Sea specimens is 0.0-0.2%, while the distance between these and the generitype is 7.5 -7.7%. This interspecific nucleotide diversity is as high as the diversity between R. antillana and Rhodenigma contortum (7.2-7.5%), the third species in the family. RbcL pairwise distances are also high (6.7% within Renouxia, and 9.1-9.6% between Renouxia and Rhodenigma), indicating the possibility that the new species belongs to a new genus. Morphological and anatomical studies are underway to formally describe the new taxon.
- To be or not to be: Will the real Chrysymenia (Rhodymeniaceae, Rhodophyta) please stand up?Publication . Schmidt, William E.; Arakaki, Natalia; Gurgel, Carlos Frederico Deluqui; Gabriel, Daniela; Norris, James N.; Ballantine, David; Fredericq, SuzanneABSTRACT: The genera in the Rhodymeniaceae that have a hollow thallus lacking diaphragms comprise Chrysymenia J. Agardh (including Gloiosaccion Harvey), Botryocladia (Agardh) Kylin and Irvinea Guiry. Chrysymenia has traditionally been defined by a lack of internal rhizoids and with the only solid portion of the thallus limited to the stipe, and Botryocladia is characterized by the presence of larger, solid axes.