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Plate 12 | Swiss Journal of Palaeontology

Plate 12

From: The planktonic foraminifera of the Jurassic. Part I: material and taxonomy

Plate 12

Globuligerina oxfordiana (Grigelis) 1958, para- and topotypes. Top row Topotypes, Jotija borehole, 143 m, sample 10, Early Oxfordian, SW. Lithuania. No. 1, spiral view, dextral coiling, diameter 160 μm; no. 2, spiral view, sinistral coiling, diameter 155 μm; no. 3, umbilical, diameter 174 μm and detail of microperforate and pustule wall surface with filled pore mounds; mounds up to 3 µm in diameter. Second row from top Topotypes, J otija borehole, 143 m, sample 10, Early Oxfordian, SW. Lithuania. No. 1, spiral view, dextral coiling, diameter 184 μm; no. 2, side view and detail of pustule wall surface, rarely joining in short ridges, diameter of pustulae up to 4 μm; the thickness of the bilamellar and microperforate wall in the far right picture exceeds 5 µm. Second row from bottom Paratypes, Shatrishche-2, sample 801, Middle to Late Oxfordian, Rjasan’ District, Central Russia. No. 1, spiral view, sinistral, diameter 160 μm; no. 2, side view, reticulate wall surface with detail in no. 3; no. 4, peripheral view of specimen with pustule wall surface and fragment of bulla wall above aperture. Bottom row Paratypes, Shatrishche-2, sample 801, Middle to Late Oxfordian, Rjasan’ District, Central Russia. No. 1, spiral view, pustulose wall, loop-shaped aperture with narrow rim and remnant of bulla; test diameter 170 μm; no. 2, detail of pustule wall surface with pore mounds and minor wall surface reticulation; no. 3, slightly oblique umbilical view with pustulose wall in last chamber and tendency to reticulation in older chambers, looped aperture and bulla remnant, test diameter 150 µm; no. 4, umbilical view, pustulose last chamber and more reticulate older chambers, looped aperture with strong lip, test diameter 150 µm

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