''Alexandrium tamarense'' is a species of

dinoflagellate The Dinoflagellates (), also called Dinophytes, are a monophyletic group of single-celled eukaryotes constituting the phylum Dinoflagellata and are usually considered protists. Dinoflagellates are mostly marine plankton, but they are also commo ...

s known to produce

saxitoxin Saxitoxin (STX) is a potent neurotoxin and the best-known paralytic shellfish toxin. Ingestion of saxitoxin by humans, usually by consumption of shellfish contaminated by toxic algal blooms, is responsible for the illness known as paralytic she ...

, a neurotoxin which causes the human illness clinically known as

paralytic shellfish poisoning Paralytic shellfish poisoning (PSP) is one of the four recognized syndromes of shellfish poisoning, which share some common features and are primarily associated with bivalve mollusks (such as mussels, clams, oysters and scallops). These shellfi ...

(PSP). Multiple species of

phytoplankton Phytoplankton () are the autotrophic (self-feeding) components of the plankton community and a key part of ocean and freshwater Aquatic ecosystem, ecosystems. The name comes from the Greek language, Greek words (), meaning 'plant', and (), mea ...

are known to produce saxitoxin, including at least 10 other species from the genus ''

Alexandrium Alexandreion (Greek), or Alexandrium (Latin), called Sartaba in the Mishna and Talmud and Qarn Sartaba in Arabic, was an ancient hilltop fortress constructed by the Hasmoneans between Scythopolis and Jerusalem on a pointy barren hill towering ...

''. Recent molecular work shows that this species belongs to the ''Alexandrium tamarense'' complex (Atama complex, including ''A. tamarense,'' '' Alexandrium fundyense,'' '' Alexandrium catenella'') and that none of the three original morphospecies designations forms monophyletic groups in the present small ribosomal subunit (SSU)–based and previous large ribsosomal subunit (LSU)–based

ribosomal RNA Ribosomal ribonucleic acid (rRNA) is a type of non-coding RNA which is the primary component of ribosomes, essential to all cells. rRNA is a ribozyme which carries out protein synthesis in ribosomes. Ribosomal RNA is transcribed from ribosomal ...

phylogenetic trees, i.e. these species designations are invalid. ''A. tamarense'' contains

polyunsaturated fatty acids In biochemistry and nutrition, a polyunsaturated fat is a fat that contains a polyunsaturated fatty acid (abbreviated PUFA), which is a subclass of fatty acid characterized by a backbone with two or more carbon–carbon double bonds. Some polyunsa ...

, including

docosahexaenoic acid Docosahexaenoic acid (DHA) is an omega−3 fatty acid that is an important component of the human brain, cerebral cortex, skin, and retina. It is given the fatty acid notation 22:6(''n''−3). It can be synthesized from alpha-linolenic acid or ...

References

Further reading