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Authority

(Claparède & Lachmann) Stein (1867: 162)

Class

Litostomatea

Order

Cyclotrichida

Family

Mesodiniidae

Additional References

Kahl (1930: 127), Borror (1972: 38), Tamar (1992: 287), Foissner et al. (1999: 139)

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Basionym

Halteria pulex Claparède & Lachmann (1859: 370, pl. 13, figs 10, 11)

Synonyms

N/A

Description

In vivo 15–35 × 10–25 µm. Body pyriform; pre-equatorial furrow separating conical anterior from globular posterior portions; blue-green to colourless. Cytostome apical, surrounded by up to 12 bifurcated processes (retractile). 23–49 short ciliary rows in area of pre-equatorial furrow, bipartite. Pre-equatorial ciliary belt composed of anteriorly, laterally and posteriorly directed bundles of long stiff and sometimes barbed cilia; equatorial kinety belt composed of short rows of cilia which closely adjoin pellicle (difficult to observe). Macronuclear nodules 2. Contractile vacuoles 2, supraequatorial. Terminal vacuole crescent-shaped (function unknown). Movement: rapid backward jumps, resting with cilia stiffly spread; attaches with oral processes to substratum.

Distribution

Ross Sea, in the region 65.28°–76.02°S and 134.85°–165.47°W, in sea-ice (Petz, unpublished data); cosmopolitan in marine and fresh waters.

Comments

N/A

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