Elphidium advenum ( Cushman, 1922 )

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 : 26

Elphidium advenum ( Cushman, 1922)

Figure 5.10

1922 Polystomella advena Cushman : p. 56, pl. 9, figs. 11, 12.

1930 Elphidium advenum (Cushman) ; Cushman, p. 25, pl. 10, figs. 1, 2.

1994 Elphidium advenum (Cushman) ; Jones, p. 108, pl. 110, fig. 1.

2006 Elphidium advenum (Cushman) ; Debenay and Luan, pl. 2, fig. 46.

Morphological description. The wall is calcareous, planispiral enrolled; peripheral outline slightly lobate, slightly compressed, biconvex profile; periphery acute, with a strong rounded keel; 12 to 15 chambers in final whorl; sides flattened to slightly concave; sutures flush to slightly depressed, moderately curved backwards; flattened boss in the umbilicus; wall opaque white.

Occurrence. rare species in Guadiana Estuary; only recorded in summer, at the estuary 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.