dcsimg

Distribution

provided by World Register of Marine Species
A cold-water species, so far restricted to the Northern hemisphere
license
cc-by-4.0
copyright
WoRMS Editorial Board
bibliographic citation
Harðardóttir S, Pančić P, Tammilehto A, Nielsen TG, Krock B, Møller EF, Lundholm N. (2015). Dangerous relations in the arctic marine food web – interactions between domoic acid producing Pseudo-nitzschia diatoms and Calanus copepodites. <em>Marine Drugs.</em> 13, 3809-3835. Hasle G.R., Lundholm N., 2005. Pseudo-nitzschia seriata f. obtusa (Bacillariophyceae) raised in rank based on morphological, phylogenetic and distributional data. Phycologia 44:608-619. Hasle G.R., Lundholm N., 2005. Pseudo-nitzschia seriata f. obtusa (Bacillariophyceae) raised in rank based on morphological, phylogenetic and distributional data. Phycologia 44:608-619.
contributor
Lundholm, Nina, N.
contributor
Lundholm, Nina, N.

Identification

provided by World Register of Marine Species
requires electron microscopy. The main characteristics of P. obtusa are the asymmetric valve and the 2 rows of poroids. P. obtusa is phylogenetically and morphologically closely related to P. seriata and P. australis, two other species with asymmetric valves. The main differences are the number of poroid rows in the striae, poroid density, and valve width. P. obtusa: 2 rows - 6-8 poroids/µm - 2.9-5.0µm P. seriata:: (2)-4 rows - 6-9 poroids/µm - 4.6-8.0µm P. australis:: 2 rows - 4-5 poroids/µm - 6.5-8.0µm Verified sequences of ITS rDNA (ITS1, 5.8S, ITS2) are: P. obtusa (DQ062667); P. seriata (DQ062663); P. australis (DQ062661)
license
cc-by-4.0
copyright
WoRMS Editorial Board
bibliographic citation
Harðardóttir S, Pančić P, Tammilehto A, Nielsen TG, Krock B, Møller EF, Lundholm N. (2015). Dangerous relations in the arctic marine food web – interactions between domoic acid producing Pseudo-nitzschia diatoms and Calanus copepodites. <em>Marine Drugs.</em> 13, 3809-3835. Hasle G.R., Lundholm N., 2005. Pseudo-nitzschia seriata f. obtusa (Bacillariophyceae) raised in rank based on morphological, phylogenetic and distributional data. Phycologia 44:608-619. Hasle G.R., Lundholm N., 2005. Pseudo-nitzschia seriata f. obtusa (Bacillariophyceae) raised in rank based on morphological, phylogenetic and distributional data. Phycologia 44:608-619.
contributor
Lundholm, Nina, N.
contributor
Lundholm, Nina, N.