Carchesium Ehrenberg, 1830 (ref. ID; 2014)
Class Oligohymenophora: Subclass Peritricha: Order Peritrichida: Suborder Sessilina (ref. ID; 2014)
Family Vorticellidae Kent (ref. ID; 1248)

[ref. ID; 2014]
Colonial. Inverted bell-shaped zooids borne upon the ends of a branched stalk which contracts in a spiral fashion. Contraction of the stalk is by means of a discontinuous myoneme, which can cause the side branches of the colony to contract independently of each other. Peristome with lip as in Epistylis. Carchesium was first described by Ehrenberg (1830) and the genus is most easily mistaken for the other contractile colonial peritrichs Pseudocarchesium and Zoothamnium. However, in both of these genera the stalks contract in a zigzag fashion, not spirally. In Pseudocarchesium the myoneme is also discontinuous but in Zoothamnium the myoneme is continuous throughout the colony.
Quote; Colin R. Curds, Michael A. Gates and David McL. Roberts "British and other freshwater ciliated protozoa Part II Ciliophora: Oligohymenophora and Polyhymenophora" Cambridge University Press, 1983 (ref. ID; 2014)

Carchesium granulatum Kellicott, 1887 (ref. ID; 1620) reported year? (ref. ID; 1618)
Description; Two contractile vacuoles anterior; on Cambarus and aquatic plants. (ref. ID; 1618)
Measurements; About 100 um long. (ref. ID; 1618)
Carchesium polypinum Linnaeus, 1758 (ref. ID; 1219, 1557, 1620, 1896, 2245, 2573, 3292) reported year? (ref. ID; 1618), Linne (ref. ID; 3343, 5462) or (Linnaeus, 1758) Ehrenberg, 1830 (ref. ID; 4610) reported author and year? (ref. ID; 191, 3113, 7114)
Syn; Carchesium corymbosum Penard, 1922 (ref. ID; 4610); Sertularia polypina Linnaeus, 1758 (ref. ID; 4610)
Description; Body bell-shaped, very often more or less bent; peristome outwardly extended; 1 long band-like macronucleus extends along the longitudinal axis of the cell; 1 contractile vacuole near the buccal cavity; sessile; colonial; young solitary individuals of C. polypinum resemble mature stages of the non-colonial Vorticella convallaria, which may occur in the same habitats. (ref. ID; 1219)
[Sessile zooids]: Sessile zooids were bell-shaped, and contracted forms were cylindrical, 80-110 um long. Stalks were branched with a regular dichotomous pattern and were up to 1 mm long. (ref. ID; 3113)
[Microgamonts]: Microgamonts were spherical (25-30 um diameter), had an irregular and apparently non-directional pattern of swimming, and could generally be found near colonies. (ref. ID; 3113)
[Telotrochs]: Telotrochs were cylindrical with an oral-aboral axis of 50-90 um, and had a directional swimming pattern. (ref. ID; 3113)
Molecular analysis. (ref. ID; 7114)
Measurements; Individuals 80-140 um, colonies up to 3 mm; main stalk up to 1 mm long and 20 um in diameter. (ref. ID; 1219)
100-125 um long. (ref. ID; 1618)
Length of cells 60 um. (ref. ID; 3343)