Ammobaculites exiguus Cushman and Brönnimann, 1948b

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 : 18

Ammobaculites exiguus Cushman and Brönnimann, 1948b

Figure 2.18

1948b Ammobaculites exiguus Cushman and Brönnimann : p. 38, pl. 7, figs. 7, 8.

1953 Ammobaculites exiguus Cushman and Brönnimann ; Parker, Phleger and Pierson, p. 5, pl. 1, fig. 16.

1986 Ammobaculites exiguus Cushman and Brönnimann ; Brönnimann and Keij, pl. 3, fig. 7.

1995 Ammobaculites exiguus Cushman and Brönnimann ; Scott, Hasegawa, Saito, Ito and Collins, p. 292, fig. 6.1.

2005 Ammobaculites exiguus Cushman and Brönnimann ; Barbosa, Scott, Seoane and Turcq, p. 39, pl. 1, fig. 9.

Morphological description. Test agglutinated,

elongate, initially planispirally coiled and latter with several uniserial chambers; aperture terminal and rounded.

Occurrence. Very rare, occurring only in one sample, near the Ayamonte Sewage Treatment Plant.

Figures

FIGURE 2. Scanning electron micrographs of the foraminifera specimens. Scale bar equals 100 µm. 1-3- Three different specimens of Polysaccammina ipohalina Scott, 1976b, illustrating the differences in size and form. In all specimens it is possible to see attached organic matter; 4-5- Polysaccammina hyperhalina Medioli, Scott, and Petrucci, 1983. 4- complete specimen of P. hyperhalina; 5- aperture view; 6- specimen with several side branches; 7-10- different sized specimens of Ammovertellina sp.; 11-14- various specimens of Reophax nana Rhumbler, 1913; 15-17- Leptohalysis scottii (Chaster, 1892); 15 and 16- side view of two complete specimens; 17- detail on the agglutination of the last chamber; 18- complete specimen of Ammobaculites exiguus Cushman and Brönnimann, 1948b; 19- Ammobaculites sp. with the uncoiled portion broken; 20-22- Ammotium salsum (Cushman and Brönnimann, 1948a); 20- best specimen; 21- smaller specimen; 22- aperture detail; 23- Ammotium sp.; 24-26- different specimens of Miliammina fusca (Brady, 1870); 27-28- Miliammina obliqua Heron-Allen and Earland, 1930; 27- view of the interio-marginal arch of the aperture; 29-30- Arenoparrella mexicana (Kornfeld, 1931); 29- ventral side with view to main aperture and supplementary apertures; 30- dorsal side with view to supplementary apertures; 31-32- Deuterammina eddystonensis Brönnimann and Whittaker, 1990; 31- dorsal view; 32- ventral view; 33-35- Jadammina macrescens (Brady, 1870); 33- dorsal view; 34- ventral view; 35- dorsal view of a deformed test.