Eurytemora

Eurytemora
Eurytemora affinis
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Copepoda
Order:	Calanoida
Family:	Temoridae
Genus:	Eurytemora Giesbrecht, 1881 [1]
Type species
Eurytemora affinis
Synonyms [1]
TemorellaClaus, 1881

Eurytemora is a genus of copepods in the family Temoridae. ^[1]

Directional selection is one type of natural selection where individuals with characteristics at one end of a continuum are favored, hence increasingly shifting the overall mean of that trait within the population. For example, in the copepod Eurytemora affinis, the populations that had invaded freshwater environments experienced directional selection for improved osmoregulatory ability, such that individuals were able to cope better with lowered levels of salinity and therefore survive and reproduce more successfully.

Species

The World Register of Marine Species lists the following species: ^[1]

• Eurytemora affinis (Poppe, 1880)
• Eurytemora americana Williams, 1906
• Eurytemora arctica Wilson M.S. & Tash, 1966
• Eurytemora asymmetrica Smirnov, 1935
• Eurytemora bilobata Akatova, 1949
• Eurytemora brodskyi Kos, 1993
• Eurytemora canadensis Marsh, 1920
• Eurytemora carolleeae Alekseev & Souissi, 2011
• Eurytemora caspica Sukhikh & Alekseev, 2013
• Eurytemora clausii (Hoek, 1876)
• Eurytemora composita Keiser, 1929
• Eurytemora foveola Johnson M.W., 1961
• Eurytemora gracilicauda Akatova, 1949
• Eurytemora gracilis (Sars G.O., 1898)
• Eurytemora grimmi (Sars G.O., 1897)
• Eurytemora herdmani Thompson I.C. & Scott A., 1897 in Thompson, Scott & Herdman, 1897
• Eurytemora kurenkovi Borutsky, 1961
• Eurytemora lacinulata (Fischer, 1853)
• Eurytemora lacustris (Poppe, 1887)
• Eurytemora minor Behning, 1938
• Eurytemora pacifica Sato, 1913
• Eurytemora raboti Richard, 1897
• Eurytemora richingsi Heron & Damkaer, 1976
• Eurytemora velox (Lilljeborg, 1853)
• Eurytemora wolterecki Mann, 1940
• Eurytemora yukonensis Wilson M.S., 1953

References

1. Lee, Catherine E., and John D. McPhail. "Directional Selection and Rapid Adaptation in Eurytemora affinis." Journal of Evolutionary Biology, vol. 17, no. 6, 2004, pp. 1270–1277.

Czajka, Frank, et al. "Rapid Evolution of Salinity Tolerance in the Invasive Copepod Eurytemora affinis." Evolutionary Applications, vol. 6, no. 3, 2013, pp. 368–377.