(Pyrgoella irregularis)

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Pyrgoella irregularis (Plesiotypes 1, 2, & 3, from sample Bioice3509: depth 1678 m; bottom water temp. 2,7°C; loc.62,0444°N, -19,6531°W Dec.Degr.; Plesiotype 4, axial section, from sample Bioice3504: depth 1733 m; bottom water temp. 3,09°C; loc. 62,0294°N, -19,8208°W Dec.Degr.) – Ljósm. Guðmundur Guðmundsson

Almennt

Pyrgoella irregularis (d'Orbigny, 1839) 

Pyrgoella irregularis (d‘Orbigny 1839) – sensu  Jones, R.W., 1994. The Challenger Foraminifera, The Natural History Museum, London, Oxford Univ. Press, p.18, pl.1, figs.17-18.

Description: Test globular; the two last chambers are externally visible; the penultimate chamber covers only a small part of the surface (about 140° of the circumference in axial section). Chambers are added in planispirally in a single plane, except perhaps for the first couple of chambers following the embryonic apparatus. Chambers walls are thick and sturdy. Aperture is nearly filled with a flap, resulting in a high arched or semi-circular slit; apertural rim is raised, thickened and slightly protruding. Sutures are distinct and only slightly depressed. Surface is smooth, but may be somewhat irregularly wrinkled in the largest specimens.

Diagnosis: Resembles Pyrgoella sphaera, but differs in having much thicker test walls and a single aperture at all developmental stages.     

Gudmundur Gudmundsson IINH (gg@ni.is)

Útbreiðslukort

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Útbreiðsla Pyrgoella irregularis (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)
(Pyrgoella irregularis)