Jadammina macrescens ( Brady, 1870 )

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 : 20

Jadammina macrescens ( Brady, 1870)

Figures 2.33-2.35 and 3.1-3.2

1870 Trochammina inflata (Montagu) var. macrescens Brady : p. 290, pl. 11, fig. 5.

1938 Jadammina polystoma Bartenstein and Brand : p. 381, fig. 1, 2.

1953 Jadammina polystoma (Brady) ; Parker, Phleger and Pierson, p. 9, pl. 2, figs. 35- 37.

1976b Trochammina inflata (Montagu) var. macrescens Brady ; Scott, p. 320, pl. 1, figs. 4- 7.

1980 Trochammina macrescens (Brady) ; Scott and Medioli, p. 44, pl. 3, figs. 1-11.

1990 Trochammina macrescens (Brady) ; Scott, Schnack, Ferrero, Espinosa and Barbosa, p. 733, pl. 1, figs. 1, 2.

2003 Trochammina macrescens (Brady) ; Javaux and Scott, p. 23, figs. 6.14-6.19.

2014 Jadammina macrescens (Brady) ; GenBank ID: 164128, www.ncbi.nlm.nih.gov/Taxonomy/Browser/ wwwtax.cgi?id=164128andlvl=0 Morphological description. Test a flattened trochospiral, that tends to be nearly planispiral in the adult; chambers increasing gradually in size as they are added, sutures radial to slightly curved, periphery rounded; wall finely and sparsely agglutinated on a proteinaceous base; imperforate; the primary aperture is a low interiomarginal equatorial slit, with one or more supplementary areal openings in the lower portion of the apertural face, each bordered by a projecting lip ( Figure 3.1-2 ).

Occurrence. Indigenous species in the modern estuary; the most ubiquitous agglutinated species, occurring along the entire estuary, but with an optimum of occurrence at the marine estuary, in the most elevated positions of the marsh, where the assemblages are almost exclusively (and in some cases, exclusively) composed of J. macrescens . This species exhibits uncommonly high densities in some places, surpassing 65,000 individuals/20 cc in sample LG1 (confined environment) in winter; dominant in both winter and summer, seems to be better adapted to winter conditions.

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.

FIGURE 3. Scanning electron and light microscope micrographs of the foraminifera specimens. Scale bar equals 100 µm except where noted otherwhise; 1-2- Jadammina macrescens (Brady, 1870); 1- supplementary apertures view; 2- detail of supplementary apertures (scale bar = 50 µm); 3-4- Lepidodeuterammina plymouthensis Brönnimann and Whittaker, 1990; 3- dorsal view; 4- ventral view; 5-8- Lepidodeuterammina ochracea (Williamson, 1858); 5- dorsal view; 6- ventral view; 7- dorsal view of a smaller specimen; 8- ventral view of a smaller specimen; 9-10- Portatrochammina sp.; 9- dorsal view; 10- ventral view; 11-13- Siphotrochammina sp.; 11- dorsal side with inter-cameral foramen view; 12- dorsal view of a smaller specimen, also with inter-cameral foramen; 13- ventral view of a smaller specimen; 14-16- Tiphotrocha comprimata Saunders, 1957; 14- dorsal view; 15- ventral view; 16- individual strongly attached to a sea-grass leaf; detail of a Pinus pollen grain at the center of the leaf; 17-21- Trochammina inflata (Montagu, 1808); 17- dorsal view; 18- ventral view; 19- ventral view with umbilical tube detail; 20- microspheric form dorsal view; 21- microspheric form ventral view; 22- Eggerelloides scaber (Williamson, 1858); 23-25- Textularia earlandi Parker, 1952; 23- apertural view; 24- lateral view; 25- profile view with aperture in detail; 26-29- Discorinopsis aguayoi (Bermúdez, 1935); 26- scanning electron dorsal view; 27- scanning electron ventral view; 28- light microscope dorsal view; 29- light microscope ventral view.