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Authority

(Kahl) Song (1990: 161, figs 1–19)

Class

Litostomatea

Order

Haptorida

Family

Pseudotrachelocercidae

Additional References

Kahl (1930: 121), Wilbert & Kahan (1981: 73), Agamaliev (1983: 65), Song (1990: 161), Petz et al. (1995: 15)

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Basionym

Trachelocerca trepida Kahl (1928a: 65, fig. 6a)

Synonyms

Enchelyodon trepida (Kahl) Borror (1965: 551, figs 1, 5)

Description

In vivo 80–200 × 30–45 µm. Body elongate, club- to spindle-shaped, anteriorly narrowed, posteriorly rounded, contractile. Somatic kineties meridional, 19–33. Circumoral kinety composed of a single dikinetid at anterior end of each somatic kinety. Adoral organelle (brosse) 25–50% of body length, parallel to somatic kineties (aklitolophic), composed of irregularly arranged dikinetids (cilia c. 10 µm long), continues posteriorly as a somatic kinety in a row of monokinetids. Extrusomes c. 4–8 µm long, fusiform, slightly bent, scattered in body. Cortical granules colourless, in interkinetal rows. Macronucleus sausage- to narrowly U-shaped; micronuclei few (c. 3). Contractile vacuole terminal. Movement: slow.

Distribution

Ross Sea, in the region 65.95°–74.00°S and 134.85°–165.02°W, in sea-ice (Petz, unpublished data); Weddell Sea (Petz et al., 1995); Atlantic (Borror, 1965); North Sea (Kahl, 1930); Caspian Sea (Agamaliev, 1983); Red Sea (Wilbert & Kahan, 1981); Arabian Gulf (Al-Rasheid, 2000); Pacific (Song, 1990).

Comments

N/A

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