Nonionellina labradorica (Dawson, 1860)

Symphonia, Tabita K. & Senthil, Nathan D., 2019, Taxonomic notes on Recent Foraminifera from the Continental Shelf-Slope Region of Southwestern Bay of Bengal, East Coast of India, Palaeontologia Electronica (55 A) 22 (3), pp. 1-89 : 28

Nonionellina labradorica (Dawson, 1860)

Figure 7.15

1860 Nonionina labradorica Dawson , p. 191, text-fig. 4.

2008 Nonionellina labradorica (Dawson) ; Riveiros and Patterson, p. 29, fig. 12.7a-c.

2010 Nonionellina labradorica (Dawson) ; Margreth, p. 123, pl. 36, fig. 4.

2014 Nonionellina labradorica (Dawson) ; Panchang and Nigam, pl. 34, figs. 8a-c, 9a-c.

Description. Test small, symmetrical on both sides, wall calcareous, finely perforate, surface smooth, granular pustules along the sutures, apertural side and the umbilicus; chambers few, rapidly increasing in size, planispirally arranged, coiling involute; periphery subacutely rounded, sutures distinct, curved and very slightly depressed; aperture an interiomarginal, narrow slit at the base of a broadly triangular apertural face.

Figures

FIGURE 7. 1-2, Amphistegina bicirculata Larsen, 1976 in dorsal view (scale equals 1 mm) (1) and in ventral view (scale equals 1 mm) (2). 3-4, Amphistegina gibbosa d’Orbigny, 1839 in dorsal view (scale equals 500 μm) (3) and in lateral view (scale equals 500 μm) (4). 5, Amphistegina lessonii d’Orbigny in Guerin-Meneville, 1843 in dorsal view (scale equals 400 μm). 6-7, Amphistegina papillosa Said, 1949 in dorsal view (scale equals 500 μm) (6) and in lateral view (scale equals 300 μm) (7). 8-10, Amphistegina radiata (Fichtel and Moll, 1798) in dorsal view (scale equals 500 μm) (8); in ventral view (scale equals 500 μm) (9); and in lateral view (scale equals 500 μm) (10). 11, Astrononion stelligerum (d'Orbigny, 1839) in dorsal view (scale equals 300 μm). 12, Nonion commune (d'Orbigny, 1846) in dorsal view (scale equals 200 μm). 13, Nonion costiferum (Cushman, 1926) in dorsal view (scale equals 200 μm). 14, Nonionella basispinata (Cushman and Moyer, 1930) in dorsal view (scale equals 200 μm). 15, Nonionellina labradorica (Dawson, 1860) in dorsal view (scale equals 200 μm). 16, Nonionoides elongatum (d'Orbigny, 1852) in dorsal view (scale equals 200 μm). 17, Nonionoides grateloupii (d'Orbigny, 1839a) in dorsal view (scale equals 200 μm). 18, Nonionoides turgida (Williamson, 1858) in ventral view (scale equals 100 μm). 19, Nonionoides boueana (d'Orbigny, 1846) in dorsal view (scale equals 200 μm). 20, Haynesina depressula (Walker and Jacob, 1798) in dorsal view (scale equals 100 μm).