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Nebela ansata

Nebela ansata, photomicrograph: Robert K. Booth

 

Nebela ansata Leidy, 1879

 

Diagnosis: Shell compressed, elongated pyriform, with two lateral tubular, horn-like, projections at the base of the neck, extending nearly parallel with the shell for about one third of the body; fundus rounded and smooth; pseudostome with a chitinoid lip.

 

Dimensions: Leidy 216-260 µm; Heger et al (2011): 220-270µm

 

Ecology: in Sphagnum-dominated peatlands in the north-eastern part of North America.

 

Remarks: This easy recognizable, even for non-specialists, and remarkable species has a very limited distribution range in the temperate part of eastern North America. Joseph Leidy found this €˜remarkable€™-looking shelled protozoan while making microscopical investigations of samples from Sphagnum, collected from cedar swamps near Absecom and Malaga, Gloucester County in New Jersey, USA. Since these initial investigations, only four publications have reported finding this species, at a site near the original Leidy locality (Stokes, 1882; Hoogenraad & de Groot, 1952) and at a site near Lanoraie, in southern Quebec (Fantham & Porter,1945). Recently it has been rediscovered in New Jersey and Nova Scotia (Heger et al, 2011).

 

Literature: Heger, T. J., Booth, R. K., Sullivan, M. E., Wilkinson, D. M., Warner, B. G., Asada, T., Mazei, Y., Meisterfeld, R. and Mitchell, E. A. D.: Rediscovery of Nebela ansata (Amoebozoa: Arcellinida) in eastern North America: biogeographical implications – Journal of Biogeography 38, issue 10, 1897-1906, 2011.

 

Nebela ansata-like

This specimen was collected from the Sima-Moor in Tirol, Austria (2012). It shows two faint lateral projections, comparable with those in Nebela ansata, shell length 178 µm.

Nebela ansata

Nebela ansata, from Leidy, 1879

Nebela ansata

Nebela ansata, from Leidy, 1879

 

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