Spiroloculina excavata

.
Mynd: Guðmundur Guðmundsson

Spiroloculina excavata (Plesiotype from sample Bioice2493: depth 275 m; bottom water temp. 5,7°C; loc. 66,1717°N, -25,9386°W Dec.Degr.)

.
Mynd: Guðmundur Guðmundsson

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.)

x
Mynd: Guðmundur Guðmundsson

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.)

Almennt

Spiroloculina excavata d’Orbigny, 1846

Spiroloculina excavata d’Orbigny, 1846 –sensu John W. Murray, 2003. An illustrated guide to the benthic foraminifera of the Hebridean shelf, west of Scotland, with notes on their mode of life. Palaeontologia Electronica 5(1):31pp, (https://palaeo-electronica.org/2002_2/guide/4_13.htm), p.17 , fig. 4,13 -4,14.

Description:  Test slightly ovate in outline, biconcave with acute periphery; all chambers are visible externally. Aperture a simple opening with a bifid tooth; apertural rim is slightly thickened and protruding. Proloculus is followed by a spiral tube of one or two whorls; arrangement of later chambers is planispiral, with two chambers in a whorl, which are successivelly more compressed (widht increases more than height), resulting in a biconcave test.  Only four specimens were picked from 2 of the 1031 Bioice samples that were checked for forams.

Gudmundur Gudmundsson, IINH (gg@ni.is)

 

.
Útbreiðsla Spiroloculina excavata (Bioice samples, red dots; miscellaneous IINH samples, blue dots)

Var efnið hjálplegt? Aftur upp

Aftur upp

Takk fyrir!

Hvað má betur fara?

  • Fela
  • |