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Authority

(Lohmann) Jankowski (1976: 168)

Class

Litostomatea

 

Order

Cyclotrichida

Family

Mesodiniidae

Additional References

Kahl (1930: 127), Taylor et al. (1971: 392), Lindholm (1985: 7), Grain et al. (1982: 8), Perriss et al. (1993; 1995: 423); Laybourne-Parry & Perriss (1995); Gibson et al. (1997)

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Basionym

Halteria rubra Lohmann (1908: 303, pl. 17, fig. 39)

Synonyms

Mesodinium rubrum (Lohmann) Hamburger & Buddenbrock (1911: 26, non fig. 20)
Cyclotrichium meunieri Powers (1932: 75, fig. 1)

Description

In vivo 10–70 × 10–50 µm. Body barrel-shaped to obovoid, appearing to consist of 2 hemispherical portions, with a pre-equatorial furrow separating the broader anterior from the narrower and sometimes slightly tapering posterior portion; reddish due to cryptophycean endosymbionts, sometimes green or colourless (same species?). Cytostome absent; 6–8 distally bifurcated retractile processes on apex. About 30–50 bipartite kinety belt rows; pre-equatorial belt composed of anteriorly, laterally and posteriorly directed bundles of long and stiff cilia (bristles); equatorial belt composed of longitudinal rows of cilia which closely adjoin pellicle. Macronuclear nodules 2; micronuclei 1 or 2. Contractile vacuole lacking (?). Movement: jumping.

Distribution

Indian sector of the Southern Ocean (Archer et al., 1996b; Grey et al., 1997; Mayes et al., 1998); Ross Sea (Stoecker et al., 1993, 1995); Bellingshausen Sea (Klöser, 1990; Edwards et al., 1998); Atlantic sector of the Southern Ocean (Leakey et al., 1994; Klaas, 1997); Weddell Sea (Corliss & Snyder, 1986; Kivi & Kuosa, 1994); also found in brackish and saline lakes of the Vestfold Hills, East Antarctica (Perriss et al., 1993, 1995; Laybourn-Parry et al., 1995; Gibson et al., 1997); widespread, cosmopolitan.

Comments

Probably sometimes confused with other similarly sized, reddish ciliates (e.g. Rhabdoaskenasia; Petz, 1999).

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