Elphidium oceanensis ( d’Orbigny, 1826 )

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 : 27

Elphidium oceanensis ( d’Orbigny, 1826)

Figure 5.19-5.21

1826 Polystomella oceanensis d’Orbigny : p. 285.

1948a Cribroelphidium vadescen s Cushman and Bronnimann: p. 18, pl. 4, fig. 5.

1951 Elphidium littorale Le Calvez and Le Calvez : p. 251, figs. 5a, 5b.

1971 Elphidium oceanensis (d’Orbigny) ; Murray, p. 165, pl. 69, figs. 1-7.

1982 Elphidium gunteri Cole, 1931 ; Buzas and Severin, p. 37, pl. 8, fig. 4.

1988 Elphidium oceanensis (d’Orbigny) ; Cearreta, p. 36, pl. I, fig. 8.

1994 Elphidium gunteri Cole, 1931 ; Hayward and Hollis, p. 209, pl. 4, figs. 10-12.

2004 Elphidium oceanensis (d’Orbigny) ; Leorri and Cearreta, p. 78, pl. 1, fig. 5.

2006 Cribroelphidium mirum n. sp. Langer and Schmidt-Sinns: p. 669, figs. 1.1-1.23.

2007 Elphidium oceanensis (d’Orbigny) ; Cearreta, Alday, Freitas and Andrade, p. 134, pl. I, fig. 3.

Morphological description. The wall is calcareous; test planispiral, involute and inflated with eight to fifteen chambers in outer whorl; periphery broadly rounded, slightly to irregularly lobate;

sutures depressed, straight to gently curved; septal bridges irregular in number and degree of development; umbilicus may be slightly depressed or raised due to growth of irregular bosses; tubercular development in sutural pits, umbilical depression and base of apertural face; aperture is an interiomarginal row of arches; wall is coarsely perforate and usually golden brown.

Ocurrence. Has its optimum during summer, being a dominant species at middle and lower elevations (- 0.7 to 1.1 m in relation to MSL); in terms of distribution range it is almost as eurytopic as Ammonia spp. , occupying the entire study range of elevation and latitude.

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.