Spirophthalmidium tenuiseptatum

Picture: Guðmundur Guðmundsson

Spiroloculina tenuiseptatum (Plesiotype from sample Bioice2884: depth 229m; bottom water temp. 6,14°C; loc.65,1722°N, -27,0694°W Dec.Degr.)

Picture: 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.)

Picture: 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.)


Spirophthalmidium tenuiseptatum (Brady, 1884) 

Spiroloculina tenuiseptata - Brady, H. B. 1884. Report on the Foraminifera dredged by H.M.S. Challenger during the Years 1873-1876. Report on the Scientific Results of the Voyage of H.M.S. Challenger during the years 1873–76. Zoology. Pl. 10, figs. 5-6. 

Spirophthalmidium tenuiseptatum (Brady, 1884) - Hayward, B.W.; Le Coze, F.; Gross, O. (2019). World Foraminifera Database, http://www.marinespecies.org/aphia.php?p=taxdetails&id=849294

Description:  Test is biconcave, lens shaped with pointed ends and acute periphery; all chambers are visible externally. Aperture is a simple opening, at the end of a protruding tube. Proloculus is followed by a spiral tube of one or two whorls; succeeding chambers are planispiral, with two chambers in a whorl, which are successivelly more compressed (widht increases more than height), resulting in a biconcave test. Post embryonic chambers are separated by a thin almost translucent septum, resulting in deep depression, often filled with adventitious material, between convolutions. In one of the specimens at hand the septum is missing in the later windings, leaving an open space between successive chambers. Only 6 specimens were picked from 3 of the 1031 Bioice samples that were checked for forams.

Gudmundur Gudmundsson, IINH (gg@ni.is)

Útbreiðsla Spirophthalmidium tenuiseptatum (Bioice samples, red dots; miscellaneous IINH samples, blue dots)

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