(Sigmoilopsis schlumbergeri)

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Sigmoilopsis schlumbergeri (Plesiotype1 from sample Bioice3010: depth 1875m; bottom water temp.3,0°C; loc.61,7872°N, -14,6856°W Dec.Degr. Plesiotype2 (cross section) from sample Bioice2335: depth 1105m; loc.62,4667°N, -12,9°W Dec.Degr.) – Ljósm. Guðmundur Guðmundsson

Almennt

Sigmoilopsis schlumbergeri (Silvestri, 1904)

Sigmoilopsis schlumbergeri – sensu Jones, R.W., 1994. The Challenger Foraminifera, The Natural History Museum, London, Oxford Univ. Press: pp. 23 and 24, Pl.VII, figs.1-4.

Description: Test is elongated and tapering to both ends in side view; lens shaped in apertural view; length is almost 2 times the width. Chambers are elongate of nearly uniform width, about half a coil in length. Sutures are indistinct; except for slight depressions running the length of the test between successive chambers. Chamber arrangement is sigmoid, i.e. chambers are added alternatively to a duplet of relatively tightly coiled equiangular spirals. Test wall is very thick, porcellaneous, with a relatively thin surface layer that is densely impregnated with sand grains of a varying size. In cross section, the agglutinating surface layer seems absent from the septa between previous chambers, except for some scattered sand grains. Aperture is round, with an indistinct phialine lip and a bar like tooth at the end of a short neck. Length of largest specimens about 1 mm, but commonly around 1,5 mm. 

Diagnosis: This species differs from Sigmoilopsis wanganuiensis in being much smaller, the shape is elongated and tapering to both ends; the thin agglutinating surface layer, is often is partly worn off, revealing the inner porcellaneous wall.

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Útbreiðslukort

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Útbreiðsla Sigmoilopsis schlumbergeri (Bioice samples, red dots; miscellaneous IINH samples, blue dots)

Myndir

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Hæð stöpla svarar til fjölda sýna þar sem tegundin er: fágæt (1-2 eintök); sjaldgæf (3-8 eintök); alltíð (9-32 eintök); algeng (>32 eintök). Gögn úr botndýraverkefninu (Bioice). (ENGLISH- Column height represents number of samples in bins where the species is: rare (1-2 specimens); occasional (3-8 specimens); common (9-32 specimens); and abundant (>32 specimens.) Data from the Bioice programme.) – Ljósm. Guðmundur Guðmundsson
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Dreifing tegundar eftir dýpi, seltu og sjávarhita, innan þess breytileika sem allar sýnatökustöðvar ná yfir, sýnt sem heildarspönn lóðréttra ása. Gögn úr botndýraverkefninu „BIOICE“. (ENGLISH – Occurrence zone of the species within the range of water depth, temperature, and salinity, spanned by the "Bioice" samples; demarcated by respective y-axes.) – Ljósm. Guðmundur Guðmundsson

Biota

Ríki (Kingdom)
Einfrumungar (Protista)
Fylking (Phylum)
Götungar (Foraminifera)
Ættbálkur (Order)
(Miliolida)
Tegund (Species)
(Sigmoilopsis schlumbergeri)