Daphnia pulex Leydig, 1860

Dartnall, Herbert J. G. & Hollwedel, Werner, 2007, A limnological reconnaissance of the Falkland Islands; with particular reference to the waterfleas (Arthropoda: Anomopoda), Journal of Natural History 41 (21 - 24), pp. 1259-1300 : 1271-1272

publication ID	https://doi.org/10.1080/00222930701401010
persistent identifier	https://treatment.plazi.org/id/03DCB256-FFFF-FFD7-FE3C-2A8FDDF7FB9A
treatment provided by	Felipe (2021-08-20 19:33:56, last updated by Plazi 2023-11-04 05:10:48)
scientific name	Daphnia pulex Leydig, 1860
status

Treatment

Daphnia pulex Leydig, 1860 View in CoL

Although Ekman (1905) emphasized the similarities between the specimens he found on the Falkland Islands with Daphnia obtusa from Tierra del Fuego by Vávra (1900), our specimens are definitely D. pulex , not D. obtusa .

Female: 1.42–1.65 mm, valves broad and oval, dorsal and ventral margin with denticles, inner ventral margin without setae, shell spine short or absent, all juveniles with spines; ventral margin of head concave; antennulae do not reach tip of rostrum. Post-abdominal claw with a pecten of eight to nine denticles.

Juvenile male: 0.62–0.95 mm; anterior ventral margin with long spines; rostrum short; antennulae nearly as long as flagellum, not on a curved projection. Second abdominal projection relatively short, not reaching the root of abdominal setae; dorsal margin of postabdomen straight as in D. obtusa . Daphnia pulex was reported from the Falkland Islands by both Smith and Sayers (1971) and Brooks et al. (2005). According to Benzie (2005) the occurrence of D. pulex in South America is doubtful, suggesting our specimens may belong to a different species. This needs clarification.

References

Benzie JAH. 2005. The genus Daphnia (including Daphniopsis) (Anomopoda: Daphniidae). Ghent: Kenobi Productions; Leiden: Backhuys Publishers, 376 p. (Guides to the identification of the microinvertebrates of the continental waters of the world; 21).

Brooks S, Boxshall G, Kattel G, Flower R. 2005. Aquatic invertebrates collected from inland waters of the Falkland Islands 2001 [online]. www. geog. ucl. ac. uk / ecrc / fibril / inverts. htm.

Ekman S. 1905. Cladoceren und Copepoden aus antarktischen und subantarktischen Binnengewassern, gesammelt von der schwedischen antarktischen Expedition 1901 - 1903. Wissenschaftliche Ergebnisse der Schwedischen Sudpolarexpedition 1901 - 1903 5: 1 - 40.

Smith WA, Sayers RL. 1971. Entomostraca (with a resume on all Entomostraca recorded from the Antarctic and sub-Antarctic islands). In: Van Zinderen Bakker EM, Winterbottom JM, Dyer RA, editors. Marion and Prince Edward Islands. Report on the South African biological and geological expedition. Cape Town: A. A. Balkema. p 361 - 372.

Vavra W. 1900. Susswasser-Cladoceren. Ergebnisse Hamburger Magalhaensische Sammelreise 5: 1 - 25.