Fine structure, taxonomy, and systematics of the centric diatom Fryxelliella gen. nov. (Eupodiscaceae, Bacillariophyta) having a new valve structure, the circumferential marginal tube, with descriptions of F. floridana sp. nov. and F. inconspicua (Rattray) comb. nov.

Prasad, A. K. S. K.; Riddle, Kimberly A.; Livingston, RJ

doi:10.2216/i0031-8884-36-4-305.1

Cited by 12 publications

(18 citation statements)

References 5 publications

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“…The mantle and cingulum of Fryxelliella floridana showed structures not previously recorded (Prasad et al, 1997). Two silica strips separated by a sulcus were observed on the mantle edge, resembling the ornamentations found in Cerataulus (Round et al, 1990).…”

Section: Discussionsupporting

confidence: 53%

“…In the latter, there is only one single silica strip, but it also possesses granular plates, as in F. floridana. Prasad et al (1997) also observed the silica strip bearing granules, but not the smooth strip, perhaps because their Figs. 34 and 35 masked it due to the valve positioning in the stub.…”

Section: Discussionmentioning

confidence: 96%

“…Prasad & Nienow (1988) and Prasad et al (1997) commented that these external openings were flushed with the valve surface and could not be viewed, or they did not exist. The location of the external opening of the rimoportulae is interesting from a phylogenetic viewpoint.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, Prasad et al (1997) established the genus Fryxelliella Prasad, which is distinguished from other related genera by the presence of a circumferential marginal tube, loculate areolae with a circular pattern of external cribra, a variable number of ocelli, and rimoportulae bearing an external tube, opening to the inner side by means of a labiate fissure. Two species were placed in the genus: F. floridana Prasad and F. inconspicua (Rattray) Prasad (= Eupodiscus inconspicuous Rattray).…”

Section: Introductionmentioning

confidence: 99%

“…Two species were placed in the genus: F. floridana Prasad and F. inconspicua (Rattray) Prasad (= Eupodiscus inconspicuous Rattray). Although the genus Fryxelliella is closely related to Eupodiscus, Prasad et al (1997) considered the occurrence of a marginal tube to be a diagnostic character, absent in other diatom taxa.…”

Section: Introductionmentioning

confidence: 99%

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New observations on frustule morphology of Eupodiscus radiatus Bailey and Fryxelliella floridana Prasad

Fernandes

2003

Braz. J. Biol.

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A study of the diatoms Eupodiscus radiatus Bailey and Fryxelliella floridana Prasad, mainly focussing on the mantle and cingulum, provided new morphological information. In E. radiatus dendritic structures and two types of a palisade-like structure fixed to silica rings were found on the lower valve mantle. Cingulum presented 1-3 bands with areolae arranged in decussate rows. Furthermore, the pars interior of the valvocopula is fimbriate; and the external openings of the rimoportulae are located along the rim of the scalloped extension. The valvocopula of F. floridana is open and its copula is ligulate. Both bands possess poroid areolae similar in size to the cribral pores on the valve face. The genus Eupodiscus is compared to Fryxelliella, based on material sampled in estuaries of Southern Brazil.Key words: Eupodiscus, Fryxelliella, taxonomy, diatom, Bacillariophyta, Southern Brazil. RESUMO Observações inéditas sobre a morfologia das frústulas de Eupodiscus radiatusBailey e Fryxelliella floridana Prasad Um estudo morfológico sob microscopia eletrônica das diatomáceas Eupodiscus radiatus e Fryxelliella floridana (Triceratiaceae) foi realizado, enfocando principalmente o manto e o cíngulo. Ornamentações não registradas previamente são descritas. Em E. radiatus, estruturas dendríticas semelhantes a estrelas foram encontradas sobre o manto, logo abaixo das ondulações marginais. Dois tipos de paliçada silicosa provida de grânulos e fixada a anéis silicosos também foram observados, todo o conjunto envolvendo o manto. O cíngulo é provido de 1-3 bandas com aréolas ordenadas perpendicularmente ao eixo pervalvar, tendo "fimbrias" nas bordas superiores da valvocópula (pars interior) e encaixadas na parte interna da extremidade do manto. A abertura externa da rimopórtula localiza-se nas margens das ondulações do manto. F. floridana possui duas faixas silicosas no manto e um cíngulo ligulado com aréolas semelhantes às da superfície valvar. Adicionalmente, o gênero Eupodiscus é comparado à Fryxelliella a partir de observações de frústulas de F. floridana e E. radiatus coletadas em estuários do sul do Brasil.Palavras-chave: Eupodiscus, Fryxelliella, taxonomia, diatomácea, estuário, sul do Brasil.

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Section: Discussionsupporting

confidence: 53%

Section: Discussionmentioning

confidence: 96%