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Authority

Laackmann (1910a: 383, pl. 36, fig. 5; pl. 43, figs 1–4)

Class

Spirotrichea

Order

Tintinnida

Family

Xystonellidae

Additional References

Kofoid & Campbell (1929: 132), Balech (1947: 84), Hada (1961: 144), Sassi & Melo (1986: 76), Van der Spoel (1986: 7), Barria de Cao (1987: 279), Wasik & Mikolajczyk (1992: 233, 1994b: 79), Petz et al. (1995: 154), Wasik (1998: 10), Alder (1999: 349)

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Basionym

N/A

Synonyms

Cymatocylis affinis Laackmann (1910a: 384, pl. 43, figs 5–15)
Cymatocylis affinis/convallaria Laackmann 1910a (e.g. Boltovskoy & Alder, 1992; Wasik & Mikolajczyk, 1994b)
?Amphorella antarctica Cleve (1901: 923, fig. 1)
?Cymatocylis antarctica (Cleve) Kofoid & Campbell (1929: 123, fig. 235)
Cyttarocylis parva Laackmann (1907: 237, fig. 5)
Cymatocylis parva (Laackmann) Laackmann (1910a: 386, pl. 35, fig. 6)
Coxliella cymatiocoides Kofoid & Campbell (1929: 96, fig. 200)
Cymatocylis gaussi Kofoid & Campbell (1929: 138, fig. 274)
Cymatocylis scyphus Kofoid & Campbell (1929: 142, fig. 268)

Description

Lorica 55–226 × 46–130 µm, inverted bell-shaped; inner collar serrated, wavy or smooth; outer collar usually bent downwards; antapically blunt to pointed; wall hyaline, without agglutinated particles. Trophont with 37–39 somatic kineties (c. 15 in lateral field, 12 in left and 9 in right field, 1 ventral kinety, 1 dorsolateral kinety). Adoral membranelles 18 external and 1 internal. Macronuclear nodules 2. Contractile vacuole probably 1. Movement: moderately fast. Rarely, lorica goblet-shaped or coxlielliform (cup-shaped, posteriorly narrowly to broadly rounded; wall annulated).

Distribution

Indian sector of the Southern Ocean (Laackmann, 1910a; Hada, 1970); Pacific sector of the Southern Ocean (Balech, 1958b; Tumantseva, 1989); Ross Sea (Hopkins, 1987; Monti & Fonda Umani, 2000); Bellingshausen Sea (e.g. Balech, 1958a, 1973a; Barria de Cao, 1987; Klöser, 1990); Atlantic sector of the Southern Ocean (e.g. Wasik & Mikolajczyk, 1990; Thompson et al., 1999); Weddell Sea (e.g. Balech & El-Sayed, 1965; Boltovskoy & Alder, 1992; Petz et al., 1995); South Atlantic (Alder, 1999); South Indian Ocean (Cleve, 1901); North Pacific (Kofoid & Campbell, 1929).

Comments

Boltovskoy & Alder (1992) suggested conspecificity of C. convallaria with the much larger C. drygalskii, whereas Williams et al. (1994) maintained C. convallaria and C. parva as separate species.

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