Helenina anderseni (Warren, 1957)

Camacho, S, Moura, D, Connor, S, Scott, DB & Boski, T, 2015, Taxonomy, ecology and biogeographical trends of dominant benthic foraminifera species from an Atlantic-Mediterranean estuary (the Guadiana, southeast Portugal), Palaeontologia Electronica 52 (4), pp. 1-37 : 25

Helenina anderseni (Warren, 1957)

Figure 5.6-5.7

1957 Pseudoeponides anderseni Warren : p. 39, pl. 4, figs. 12-15.

1961 Helenina anderseni (Warren) ; Saunders, p. 148;

1980 Helenina anderseni (Warren) ; Scott and Medioli, p. 40, pl. 5, figs. 10, 11.

1991 Helenina anderseni (Warren) ; Scott, Suter and Kosters, p. 385, pl. 2, figs. 19, 20.

1999a Helenina anderseni (Warren) ; Hayward Grenfell, Reid and Hayward, p. 138, pl. 10, figs. 1-3.

2003 Helenina anderseni (Warren) ; Javaux and Scott, p. 16, figs. 6.3, 6.4.

Morphological description. Test calcareous, finely perforate; surface smooth; low trochospiral, both sides flattened; chambers enlarging gradually; sutures curved, oblique, depressed, on the opposite side the somewhat produced umbilical flaps of successive chambers overlap to close the umbilicus; aperture an extraumbilical interiomarginal slit, bordered by a lip; supplementary sutural apertural slits present on both sides.

Occurrence. Rare species, with a narrow distribution restricted to the estuary’s lower reaches.

Figures

FIGURE 5. Scanning electron and light microscope micrographs of the foraminifera specimens. Scale bar equals 100 µm. 1- Lamarckina haliotidea (Heron-Allen and Earland, 1911) ventral view; 2-3- Asterigerinata mamilla (Williamson, 1858); 2- dorsal view; 3- ventral view; 4-5- Discorbis sp.; 4- dorsal view; 5- ventral view; 6-7- Helenina anderseni (Warren, 1957); 6- dorsal view; 7- ventral view; 8- Haynesina depressula (Walker and Jacob, 1798) side view; 9- Haynesina germanica (Ehrenberg, 1840) side view; 10- Elphidium advenum (Cushman, 1922) side view; 11- Elphidium excavatum (Terquem, 1875) side view; 12-15- Elphidium wiliamsoni Haynes, 1973; 12- side view in light microscope image; 13- side view in scanning electron image; 14- profile view in scanning electron image; 15- side view of a smaller specimen in scanning electron image; 16-18- side view of different size Elphidium gerthi Van Voorthuysen, 1957; 19-21- Elphidium oceanensis (d’Orbigny, 1826); 19- side view in scanning electron image; 20- profile view in scanning electron image; 21- side view in light microscope image; 22- Elphidium poeyanum (d’Orbigny, 1826) side view; 24-27- Ammonia sp1; 24- dorsal view; 25- profile view; 26- ventral view; 27- dorsal view in light microscope image; 28-31- Ammonia sp2 (Ammonia aberdoveyensis Haynes, 1973); 28- dorsal view; 29- profile view; 30- ventral view; 31- dorsal view in light microscope image; 32-35- Ammonia sp3 (Ammonia aberdoveyensis Haynes, 1973); 32- dorsal view; 33- profile view; 34- ventral view; 35- dorsal view in light microscope image.