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Authority

(Müller) Stein (1859a: 129, pl. 4, figs 1–5)

Class

Spirotrichea

Order

Euplotida

Family

Uronychiidae

Additional References

Kent (1882: 797), Kahl (1932: 627), Borror (1963: 128), Curds & Wu (1983: 220), Hill (1990: 100), Petz et al. (1995: 173)

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Basionym

Trichoda transfuga Müller (1776: 7, pl. 9, fig. 4)

Synonyms

Uronychia antarctica Valbonesi & Luporini (1990a: 365, figs 1–6)
Uronychia binucleata Young (1922: 360, figs 4–6)
Uronychia uncinata Taylor (1928: 3, fig. 1)

Description

In vivo usually 80–110 × 50–65 µm. Body ±rectangular, indented in area of transverse and left-marginal cirri, with spur-like protrusions anteriorly and posteriorly, dorsoventrally flattened. Cirri very prominent: 6 frontoventral, 4 or 5 transverse, 3 left-marginal, 3 caudal. Dorsal kineties 6. Adoral zone of membranelles bipartite, with 11 anterior and 5 posterior membranelles. Undulating membrane almost surrounding a very large oral area. Macronuclear nodules 2, elongate-ellipsoidal; micronucleus 1. Contractile vacuole 1. Movement: usually jumping and swimming very fast, sometimes slowly and wobbly, resting in-between.

Distribution

Ross Sea, in the region 66.00°–74.70°S and 164.10°E–134.85°W, in sandy sediments, seawater and sea-ice (Valbonesi & Luporini, 1990a; Petz, unpublished data); Atlantic sector of Southern Ocean (Song & Wilbert, 2002b); Weddell Sea (Fenchel & Lee, 1972; Petz et al., 1995); Greenland Sea (Agatha et al., 1993); widespread and cosmopolitan.

Comments

Specimens with a nodulated, C-shaped or horseshoe-shaped macronucleus belong to U. heinrothi Buddenbrock (see Petz et al., 1995).

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