Chaetoceros decipiens

• Main Authors: Li, Yang, Boonprakob, Atchaneey, Gaonkar, Chetan C., Kooistra, Wiebe H. C. F., Lange, Carina B., Hernández-Becerril, David, Chen, Zuoyi, Moestrup, Øjvind, Lundholm, Nina
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2017
• Subjects: Biodiversity; Taxonomy; Chromista; Ochrophyta; Bacillariophyceae; Chaetocerotales; Chaetocerotaceae; Chaetoceros; Chaetoceros decipiens; Norwegian Sea; Greenland; Evensen; Davis Strait; Denmark Strait; North Atlantic
• Online Access: https://doi.org/10.5281/zenodo.12630662; http://treatment.plazi.org/id/E87C87F4837BFFFBFDE67DA3A8D0FE3E

Chaetoceros decipiens and C . lorenzianus The problems of identifying species in section Dicladia have focused mainly on C . decipiens and C . lorenzianus being morphologically similar with overlapping distribution. Nine of our strains of C . decipiens originated from Greenland, Denmark Strait, Norwegian Sea and Denmark, overlapping with the original localities of C . decipiens in the North Atlantic and the Davis Strait [7] and agreeing with the description of C . decipiens in having flat chains with small oval apertures and densely striated setae in the same plane ([7], our Fig 20E and 20F). Fusion of the sibling setae was very common in some of the chains (Fig 1C and 1D), but absent in others (Fig 1E and 1F); as in Cleve’s original illustration (Fig 20F). Fusing setae were observed both in C . decipiens and in the type material of C . lorenzianus (Fig 16A and 16B) In the original description of C . decipiens , the striation of the setae was mentioned to be 20– 25 in 25 μm, i.e. ca. 1 per μm, while fewer were present in the coarser C . lorenzianus [7]. In our cold-water material, which was otherwise typical of C . decipiens , striation of the setae was sometimes visible under LM (Fig 2A) and sometimes not (Fig 2B), and with a poroid density 19.9± 6.7 in 10 μm, higher than in the original description by Cleve [7]. In C . decipiens and C . elegans , the mantle had the same ornamentation as the valve face, both being perforated by poroids (Figs 3D and 5G, respectively). Such poroids were not observed on the valve and mantle of the remaining species (Figs 8F, 9C, 12C, 12D and 14H), and these species seemed to be perforated by much smaller pores. Okuno [36] stated that the valve face of C . lorenzianus lacks distinct poroids or holes, while these are distinct in C . decipiens , a view supported by Evensen & Hasle [21]. In the present study, no strains similar to C . lorenzianus were established. Permanent slides of the type material of C . lorenzianus were obtained from Vienna and observed in the LM (Table 1). ...