Arenoparrella mexicana ( Kornfeld, 1931 )

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 : 19

Arenoparrella mexicana ( Kornfeld, 1931)

Figure 2.29-2.30

1931 Trochammina inflata (Montagu) var. mexicana Kornfeld : p. 86, pl. 13, fig. 5.

1957 Arenoparrella mexicana (Kornfeld) ; Todd and Bronnimann, p. 30, pl. 4, figs. 23, 24.

1981 Arenoparrella mexicana (Kornfeld) ; Haynes, p. 104, pl. 6.10, fig. 12.

1991 Arenoparrella mexicana (Kornfeld) ; Scott, Suter and Kosters, p. 384, pl. 1, figs. 16, 17.

2003 Arenoparrella mexicana (Kornfeld) ; Duleba and Debenay, p. 77, pl. 1, figs. 11, 12.

2013 Arenoparrella mexicana (Kornfeld) ; GenBank ID: 164132, www.ncbi.nlm.nih.gov/Taxonomy/Browser/ wwwtax.cgi?id=164132andlvl=0

Morphological description. Test agglutinated, trochospiral, with supplementary apertures in the apertural face which differentiate the genus from other trochospiral forms.

Occurrence. Rare species in the live fraction,

appearing mainly in the mid-low stands of the mid-

upper estuary.

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.