Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/87152
Type: Artigo
Title: The gametogenic cycle and life history of Nicolea uspiana (Polychaeta: Terebellidae) on the south-east coast of Brazil
Author: Garraffoni André Rinaldo Senna
Yokoyama, Leonardo Querobim
Amaral, Antônia Cecília Zacagnini
Abstract: The gametogenic cycle and life history of Nicolea uspiana (Nogueira, 2003) (Polychaeta: Terebellidae) was studied by taking monthly samples over a 13 month period. Each month, 10 females were sorted; 50 oocytes were removed from the coelom of each specimen, and the maximum diameter was determined. Additionally, 10 males were sorted and 100 gametes were randomly selected from each specimen to evaluate their shape and maturation stage. This species is gonochoric and exhibits slight external sexual dimorphism (in the shape of the nephridial papillae). The sex-ratio of N. uspiana was 2.4 male for each female. The initial gametic stages of both sexes are produced in special structures called nephromixia. Oogenesis is extra-ovarian, and the germ cells are clumped and surrounded by follicle cells. These cells are ovulated into the coelomic fluid, and yolk synthesis occurs in this cavity. The maximum diameter of oocytes measured, 225 m, showed that these eggs fall into the size-range for lecithotrophy. Furthermore, N. uspiana is an iteroparous species, as the mature individuals can breed several times during their lifetime. Male gonads release germ cells early in development, and sperm maturation also occurs in the coelomic fluid. The male gametes consist of flattened plaques of germ cells attached on their anterior part by a cytophore assuming a rosette-like appearance. Following maturation of the male cells, the spermatids produce arrays of stiffly vibratile tails, assuming a morula shape. The reproductive patterns and life history of the terebellids are also discussed. Copyright © Marine Biological Association of the United Kingdom 2014.
The gametogenic cycle and life history of Nicolea uspiana (Nogueira, 2003) (Polychaeta: Terebellidae) was studied by taking monthly samples over a 13 month period. Each month, 10 females were sorted
50 oocytes were removed from the coelom of each speci
Subject: Poliqueta
Células germinativas
Oogenese
Espermatogênese
Country: Reino Unido
Editor: Cambridge University Press
Citation: Journal Of The Marine Biological Association Of The United Kingdom. Cambridge University Press, v. 94, n. 5, p. 925 - 933, 2014.
Rights: fechado
fechado
Identifier DOI: 10.1017/S0025315414000149
Address: https://www.cambridge.org/core/journals/journal-of-the-marine-biological-association-of-the-united-kingdom/article/gametogenic-cycle-and-life-history-of-nicolea-uspiana-polychaeta-terebellidae-on-the-southeast-coast-of-brazil/E6C4C6BBED7C76D9AF238E714EEDF
Date Issue: 2014
Appears in Collections:IB - Artigos e Outros Documentos

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