Pyrgoella sp.A

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Mynd: Guðmundur Guðmundsson

Pyrgoella sp.A (Plesiotype from sample Bioice3582: depth 1995 m; bottom water temp.3,13°C; loc. 62,8347°N, -29,3883°W Dec.Degr.)

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Mynd: Guðmundur Guðmundsson

Pyrgoella sp.A (Plesiotypes 1 & 2 from sample Bioice3582: depth 1995 m; bottom water temp.3,13°C; loc. 62,8347°N, -29,3883°W Dec.Degr.)

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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.)

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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

Pyrgoella sp.A

Description: Test nearly spherical; two chambers are externally visible. Proloculus followed by a planispiral tube of one or two windings, succeded by three or more opthalmidium type chambers; then several strongly embracing hemispherical chambers are added spirally in a plane that is perpendicular to the initial spire; less than two of the sub-globular chambers complete one whorl (i.e. each chamber encircles about 200° to 260° of a whorl). The largest tests comprised at least 8 subglobular chambers. Aperture is initially a round opening at the end of a slightly protrudin neck, then forming a cresecentic slit with a raised rim, gradually becoming more elongated and evenly curved, with a raised flap along the base, and an everted lip along the opposite rim. Test walls are thin and very fragile, surface is smooth and polished and suture nearly flush but distinct. The diameter of the largest specimen is 3,2 mm. 

DiagnosisPyrgoella sphaera differs in having multiple apertures, comprising irregular openings and slits, instead of a single regularly curved slit. The species Pyrgoella irregularis differs in having a much thicker and sturdier walls, and a much shorter apertural slit with thickened rims and without developing everted lips as the present species.

Gudmundur Gudmundsson IINH (gg@ni.is)

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Útbreiðsla Pyrgoella sp.A (Bioice samples, red dots; miscellaneous IINH samples, blue dots)

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