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Authority

Vørs (1993b: 275, fig. 1)

Class

Filosea

Order

Euglyphida

Family

Paulinellidae

Additional References

N/A

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Basionym

N/A

Synonyms

N/A

Description

Test 6.5–10 × 3–6 µm, elliptical; apical neck low; pseudostome 2–3 µm wide. Test composed of transversely orientated siliceous plates, on the bowl arranged in 3–5 columns with 5–7 plates each, c. 3 plates forming the neck and few smaller plates at the antapical end. Plates c. 1.7–3.5 × 0.7–2.0 µm, rectangular, with rounded corners; surface flat. Protoplast not observed.

Distribution

Indian sector of the Southern Ocean, off Davis Station (68°34’S, 77°57’E), a single test found on the undersurface of sea-ice (August 1997); subtropical Atlantic (Vørs, 1993b).

Comments

With the exception of Gromia oviformis Dujardin, 1835 (Bowser et al., 1996), which is no longer regarded as a testate amoeba (Patterson et al., 2002), this is the first reliable report of a testacean from the Southern Ocean and the second record of P. intermedia to our knowledge.

Paulinella intermedia is possibly conspecific with Calycomonas gracilis Lohmann (1908: 291, pl. 17, fig. 13) found in the Baltic Sea. The latter differs in the shorter (3–6 × 2.5–5.5 µm) and almost spherical test composed of 4 or 5 transverse rows of plates. However, as further details of C. gracilis are lacking, we refrain from synonymising the species at present.

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