Morfologia e distribuição de três diatomáceas arrafídeas (Fragilariophyceae) de águas costeiras marinhas da Argentina.
Palavras-chave:
diatomáceas arrafídeas, Pravifusus, Pseudohimantidium, PteroncolaResumo
O objetivo deste estudo está focado em análises morfológicas, taxonômicas e de distribuição de espécies de três gêneros de diatomáceas pertencentes à Classe Fragilariophyceae, Subclasse Fragilariophycidae. O material foi coletado em águas costeiras marinhas das províncias de Buenos Aires e Río Negro (Argentina) e analisados por meio de microscopia óptica e eletrônica de varredura. Pravifusus inane (Giffen) Garcia e Pteroncola inane (Giffen) Round foram encontradas na coluna d’água, enquanto Pseudohimantidium pacificum Hustedt & Krasske, foi registrada como epizoica em copépodos planctônicos. Os três gêneros são citados pela primeira vez para a Argentina e Pteroncola inane pela primeira vez para o Oceano Atlântico Sul Ocidental. A distribuição de Pravifusus inane e Pseudohimantidium pacificum é estendida para ao sul do Oceano Atlântico Sul Ocidental e a distribuição de Pteroncola inane é estendida para o
Oceano Atlântico Sul Ocidental. A Ordem Protoraphidales Round foi validada fornecendo
uma caracterização taxonômica, bem como indicando o gênero tipo.
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