A new species of nanoplanktonic diatom: Thalassiosira catharinensis (Bacillariophyceae) from Southern of Brazil

• Published in: Phytotaxa
• Main Authors: GARCIA, MARINÊS, DUTRA, DÉBORA BÄRWALDT
• Format: Article in Journal/Newspaper
• Language: English
• Published: Phytotaxa 2016
• Subjects: Algae; New Thalassiosira taxon; Santa Marta Grande Cape; Scanning Electron Microscopy; South Atlantic Ocean
• Online Access: http://www.mapress.com/j/pt/article/view/phytotaxa.288.1.6; https://doi.org/10.11646/phytotaxa.288.1.6

Thalassiosira catharinensis is a new nanoplanktonic diatom 4.4–6.6 µm diameter. The diagnostic characteristics are the presence of fultoportulae and rimoportulae with short external tubes of the same diameter, rimoportula located at same level as fultoportulae, the presence of three satellite pores around marginal and central fultoportulae, and rimportula with small, shallow internal aperture. The new species is compared to similar taxa such as Thalassiosira laevis, T. mala, T. minima, T. profunda and T. pseudonana.