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Scientific classification
Domain: Eukaryota
(unranked): SAR
(unranked): Rhizaria
Phylum: Retaria
Subphylum: Radiozoa
Class: Sticholonchea
Order: Taxopodida
Genus: Sticholonche
Binomial name
Sticholonche zanclea
Hertwig, 1877

Sticholonche is a genus of radiolarians with a single species, S. zanclea, found in open oceans at depths of 99–510 metres. It is generally considered a heliozoan, placed in its own order, called the Taxopodida. However it has also been classified as an unusual radiolarian, and this has gained support from genetic studies, which place it near the Acantharea.

Sticholonche are usually around 200 μm, though this varies considerably, and have a bilaterally symmetric shape, somewhat flattened and widened at the front. The axopods are arranged into distinct rows, six of which lie in a dorsal groove and are rigid, and the rest of which are mobile. These are used primarily for buoyancy, rather than feeding. They also have fourteen groups of prominent spines, and many smaller spicules, although there is no central capsule as in true radiolarians.


Further reading[edit]

Eskinazi-Sant'Anna, EM (August 2006). "Sticholonche zanclea (Protozoa, Actinopoda) in fecal pellets of copepods and Euphausia sp. in Brazilian coastal waters.". Brazilian journal of biology = Revista brasleira de biologia. 66 (3): 839–47. doi:10.1590/S1519-69842006000500009. PMID 17119831. Retrieved 6 February 2015.