Tres dinoflagelados nuevos o interesantes de aguas brasileñas

Abstract

El autor describe dos nuevas especies: Protoperidinium steidingerae y Gonyaulax Rutnerae. La tercera especie que se incluye en el estúdio, Protoperidinium norpacenses Balech, es poco conocida y no se habia senalado en el Atlântico. Las tres fueron obtenidas en el litoral sudbrasileno. La descripcion actual de P. norpacense completa la primera y muestra ciertas diferencias con la correspondiente a material del Pacifico. Se discuten sus relaciones con P. heteracamtum Dangeard. P. steidingerae, fue ya descrita por Steidinger & Williams (1970) como P. oblongum. Se ubica próxima a P. venustum pero tiene vários caracteres muy peculiares: apical puntiagudo; placa 1' más corta que la epiteca; placas 1' y 3' que no alcanzan al ápice donde aparentemente faltan Po y Xy, por ultimo, que hay un amplio contacto ventral entre 2' y 4' . Gonyaulax kutnerae pertenece al "grupo tamarensis"; su tamaño, forma y teca débil la diferenciar, de las otras especies del grupo. La única que tiene cierto parecido con ella es G. brevisulcatum Dangeard que es casi nomen nandum. Recientemente Taylor describio como G. brevisulcatum unas tecas que difieren mucho de G. kutnerae y que parece ser una Peridiniella, no un Gonyaulax.

Distribution of Dinophysis species and their association with lipophilic phycotoxins in plankton from the Argentine Sea

“…The most widely distributed species was Dinophysis acuminata, which is in accordance with previous reports (Balech, 1988;Sar et al, 2010;Negri et al, 2013;Sunesen et al, 2014). This species was the dominant taxon of the genus during Expeditions 1 and 3 (austral autumn and spring, respectively) and exhibited the highest cell densities at the southern extent of the sampling area, in slope waters and in the San Jorge Gulf, where surface temperatures ranged between $8 and $13 8C.…”

“…This species was the dominant taxon of the genus during Expeditions 1 and 3 (austral autumn and spring, respectively) and exhibited the highest cell densities at the southern extent of the sampling area, in slope waters and in the San Jorge Gulf, where surface temperatures ranged between $8 and $13 8C. This distributional pattern coincides with the historical predominance of this species in sub-antarctic waters at temperatures lower than 14 8C (Balech, 1988). The higher cell densities found in the San Jorge Gulf may result from the specific hydrographic conditions present in this area, such as a strongly stratified water column known to favor dinoflagellate cell accumulations (Cloern et al, 2005;Jephson and Carlsson, 2009;Krock et al, 2015).…”

“…Historical records on the occurrence of Dinophysis in the Argentine Sea include a large contingent of around 30 species, with Dinophysis acuminata cited as the most common and widely distributed species (Balech, 1988). Among these species, D. acuminata, Dinophysis tripos, Dinophysis caudata and Dinophysis fortii are included in the IOC-UNESCO reference list of toxic microalgae (Zingone and Larsen, 2014) as putative or confirmed producers of DST.…”

Redescriptions of three tintinnid ciliates, Tintinnopsis tocantinensis, T. radix, and T. cylindrica (Ciliophora, Spirotrichea), from coastal waters off China

“…Tintinnopsis radix was subsequently reported on several occasions (e.g., Balech 1959;Dolan 1991;Durán 1953;Gold and Morales 1976;Kofoid and Campbell 1929;Marshall 1969;Paulmier 1995Paulmier , 1997Pierce and Turner 1994;Tregouboff 1957;Xu and Song 2005) and in all cases it is characterized by its lorica morphology. The lorica of the Chinese population matches the original description (Imhof 1886) (Balech 1959;Kofoid and Campbell 1929;Marshall 1969;Paulmier 1997 …”

“…Tintinnopsis cylindrica has been recently redescribed based on a German population, including details of its cell morphology (Agatha and Riedel-Lorjé 2006). Tintinnopsis tocantinensis and T. radix are known only from their lorica (Balech 1948(Balech , 1959Dolan 1991). The knowledge of their ciliary pattern and living morphology is still inadequate.…”