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Authority

(Müller) Foissner, Blatterer, Berger & Kohmann (1991: 240, figs 1–14)

Class

Spirotrichea

Order

Urostylida

Family

Urostylidae

Additional References

Petz et al. (1995: 166)

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Basionym

Richoda pullaster Müller (1773: 81)

Synonyms

Holosticha diademata (Rees) Kahl sensu Song & Wilbert (2002: 53)
For additional synonyms, see Foissner et al. (1991).

Description

In vivo 50–100 × 20–35 µm. Body elongate-ellipsoidal, dorsoventrally flattened. Cirri: 3 frontal, 1 buccal, 2 frontoterminal, 6–8 transverse. Midventral row of 10 or 11 cirral pairs extending to transverse cirri. Marginal cirral rows 1 right, 1 left, the latter obliquely bent at anterior end. Dorsal kineties 4 or 5. Adoral membranelles 10–28 (anteriorly, 3–8 membranelles slightly separate). Macronuclear nodules 2; micronuclei 2. Contractile vacuole distinctly subequatorial. Movement: crawling slowly, sometimes jerking back and forth, resting for long periods.

Distribution

Ross Sea, in the region 65.28°–74.03°S and 134.85°–165.42°W, in sea-ice (Petz, unpublished data); Atlantic sector of the Southern Ocean (Song & Wilbert, 2002); Weddell Sea (Petz et al., 1995); widespread in freshwater (Foissner et al., 1991), probably cosmopolitan.

Comments

Often confused with H. diademata (Rees) Kahl, which has the contractile vacuole in mid-body (Foissner et al., 1991).

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