Elphidium excavatum (Terquem, 1875)

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 excavatum (Terquem, 1875)

Figure 5.11

1858 Polystomella umbilicatula Williamsom : p. 42, pl. 3, fig. 81.

1875 Polystomella excavata Terquem : p. 25, pl. 2, fig. 2a-f.

1952 Elphidium excavatum (Terquem) ; Parker, p. 448, pl. 3, fig. 13.

1994 Elphidium excavatum (Terquem) f. excavatum (Terquem) ; Hayward and Hollis, p. 214, pl. 5, figs. 1-5.

1998b Elphidium excavatum (Terquem) ; Debenay, Eichler, Duleba, Bonetti and Eichler-Coelho, p. 80, pl. IV, figs. 9, 10.

2003 Cribroelphidium excavatum (Terquem) f. selseyensis (Heron-Allen and Earland, 1911); Duleba and Debenay, p. 77, pl. 2, fig. 7.

2014 Elphidium excavatum (Terquem) ; GenBank, ID: 212501, www.ncbi.nlm.nih.gov/Taxonomy/Browser/ wwwtax.cgi

Morphological description. The wall is calcareous, planispiral enrolled; peripheral outline slightly lobate, rounded in edge view; eight to ten chambers in outer whorl; sutures straight to moderately curved backwards, narrow, extending into umbilical area; umbilicus depressed, covered by numerous papillae.

Occurrence. Rare species in Guadiana Estuary;

only recorded 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.