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• W2318991738 abstract "The morphologic variability of Lacustrinella lacustris (Haman and Marolt) provides a more comprehensive understanding of the ontogeny of this taxon. Lacustrinella lacustris is a unilocular, not multilocular, organism. Multilocular representatives of this species simply represent agglomerations of the unilocular chambers. The number of chambers comprising the test at any time is the most significant variable morphological feature of the taxon, along with concommitant test size variation. The chamber number ranges from 1 to 14. The genus is emended based on these new observations. INTRODUCTION o 2MI. Haman and Marolt (1985) proposed the new species Ammopemphis lacustris to accommodate hemisphaeramminid textularaceans retrieved from Lac des Allemands, a shal) low, fresh-to-brackish water lake located on the upper deltaic plain of the Mississippi Delta, Louisiana. Haman and Marolt (1985) stressed the difference in wall composition between the new species and other Ammopemphix LAC DES ALLEMANDSI species and indicated that this might be the result of ecophenotypic variation. They also suggested that AmPOINTEAUX BAIE DES mopemphix, as a result of their new observations, may HERBES DEUX have a more cosmopolitan distribution than previously * ENE believed. [ .' [ Loeblich and Tappan (1987) did not concur with Haman ... and Marolt (1985) concerning the ecologic variation of the / species but adopted a classical typological approach to the new species by selecting it as the type species for their new genus Lacustrinella. Loeblich and Tappan (1987) placed their new genus in the subfamily Hemisphaerammininae, the same subfamily in which they kept Ammopemphix. Wall composition and ecologic occurrence were utilized as evidence to differentiate the two taxa on a generic basis NTCARRACHANDELEUR NE_ / y^^%j ^cv^^ySOUND DISCUSSION 30ON Thirty four specimens of Lacustrinella lacustris (Haman ~ , o N O and Marolt) were obtained from 11 bottom samples taken in Lac des Allemands, Louisiana. The range of measured BRETON environmental parameters associated with these samples o at the time of collection were: Depth 1.52-2.28 meters (1.83 meters average); Salinity 0.27-1.62ppt (0.98ppt N average); Temperature 27-28?C (27? average); Eh 190/120mv (-161 mv average); pH 7.70-6.70 (7.24 average). The living or dead nature of the tests was not determined.o 29?N Haman and Marolt (1985) described Lacustrinella l. o 89?W lacustris as having four chambers; Loeblich and Tappan (1987, p. 36) stated it had few. Since the original description of Lacustrinella lacustris, representatives of TEXT-FIGURE 1 this taxon have been retrieved with tests frequently comLocation of Lac Des Allemands, with sample localities, on the posed of a single chamber, consistently with up to four, upper deltaic plain of the Mississippi River Delta system. rarely with five or six and in one case with 14 chambers. micropaleontology, vol. 35, no. 4, pp. 375-378, pl. 1, 1989 375 This content downloaded from 157.55.39.138 on Thu, 19 May 2016 04:28:19 UTC All use subject to http://about.jstor.org/terms Drew Haman: Ontogeny and morphologic variability of the foraminiferid Lacustrinella lacustris The single chambers are of two types. The first are complete in themselves and do not represent disaggregated elements of multichambered larger forms. They are subglobular and regularly inflated, and are not as abundant as the second type of unilocular chamber. The second kind represent disaggregated larger forms, which can be identified by evidence of the test wall having been appressed to another chamber (PI. 1, figs. 1,2). A linear relationship exists between the number of chambers comprising the test in relation to the diameter of the test. Single-chambered forms range in diameter from 0.300.90 mm (P1. 1, figs. 1,2); two-chambered forms from 0.80-1.20 mm (P1. 1, figs. 3); three-chambered forms from 1.10-1.65 mm (P1. 1, figs. 4,5); four-chambered forms from 1.00-1.80 mm (P1. 1, figs. 6-8) to the largest form with 14 chambers and a diameter of 2.75 mm (PI. 1, figs. 9-11). Such a linear relationship is only to be expected where pseudomultilocular forms are composed of conglomerations of relatively equal-sized single chambered tests. Lacustrinella exhibits morphological variation only in chamber number and corresponding test size. This is, however, simply a reflection of the aggregation of unilocular tests into larger pseudomultilocular forms. All other morphological characters, test wall construction and composition, aperture number, etc, remain constant. The discovery of unilocular representatives of this species requires that the description of the genus be emended. SYSTEMATIC DESCRIPTION Order FORAMINIFERIDA Eichwald 1830 Suborder TEXTULARIINA Delage and Herouard 1896 Superfamily ASTRORHIZACEA Brady 1881 Family HEMISPHAERAMMINIDAE Loeblich and Tappan 1961 Subfamily HEMISPHAERAMMININAE Loeblich and Tappan 1961 Genus Lacustrinella Loeblich and Tappan, emend. Haman Description: Test free, formerly attached, unilocular, single chamber subglobular, plano-convex in side view, circular to sub-circular in outline junction between dorsal and ventral sides angular; dorsal surface finely agglutinated wtih randomly arranged siliceous spicules with minor fine-grained sand, ventral surface with thin, easily ruptured, transluscent membrane; aperture a single circular to slightly irregular opening, at dorsal summit of chamber, raised slightly above chamber surface; multilocular tests represented by agglomeration of single chambers, not arranged in any fixed pattern and without intercameral connection. Lacustrinella lacustris (Haman and Marolt) As genus is monotypic, type species diagnosis is same as for genus." @default.
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• W2318991738 title "Ontogeny and Morphologic Variability of the Foraminiferid Lacustrinella lacustris (Haman and Marolt)" @default.
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