Lukas Hottinger

Illustrated glossary of terms used in foraminiferal research

Ce glossaire des termes utilise dans l’analyse de l’architecture des tests recents et fossiles de Foraminiferes, complete par une selection rigoureuse de ces termes, facilite la comprehension de leur biologie et leur utilisation en ecologie et en biostratigraphie. Il comporte pres de 650 entrees accompagnees par 83 figures, souvent composites, dont de nombreuses images stereographiques ou modelisations en 3D. Un index taxonomique repertorie les 140 taxons illustres.

Larger foraminifera, giant cells with a historical background

The history of foraminifera as recorded by the shell of numerous taxa illustrates the repetitive rise of benthic, large-sized K-strategists throughout geologic time. The phylogeny reconstructed by methods of comparative anatomy and supported by biostratigraphic distribution permits to identify analogous shell structures pointing to functions of the living cell. The shell registers autecological adaptation, ontogeny, protoplasmic streaming patterns, protoplasmic differentiation and patterns of differentiation at the cell surface. The high potential of shell regeneration points to the functional importance of shell shape during the long vegetative life and documents experiments performed by nature itself. The extended knowledge of their history, their size and their natural recording device in their shell predestines the foraminifera as experimental system to explore the performances of free-living single cells and many mechanisms regulating their life.

Age and paleoenvironment of the Maastrichtian to Paleocene of the Mahajanga Basin, Madagascar: a multidisciplinary approach

Abstract Lithology, geochemistry, stable isotopes and integrated high-resolution biostratigraphy of the Berivotra and Amboanio sections provide new insights into the age, faunal turnovers, climate, sea level and environmental changes of the Maastrichtian to early Paleocene of the Mahajanga Basin of Madagascar. In the Berivotra type area, the dinosaur-rich fluvial lowland sediments of the Anembalemba Member prevailed into the earliest Maastrichtian. These are overlain by marginal marine and near-shore clastics that deepen upwards to hemipelagic middle neritic marls by 69.6 Ma, accompanied by arid to seasonally cool temperate climates through the early and late Maastrichtian. An unconformity between the Berivotra Formation and Betsiboka limestone marks the K–T boundary, and juxtaposes early Danian (zone Plc? or Pld) and latest Maastrichtian (zones CF2–CF1, Micula prinsii ) sediments. Seasonally humid warm climates began near the end of the Maastrichtian and prevailed into the early Danian, accompanied by increased volcanic activity. During the late Danian (zones P1d–P2), a change to seasonally arid climates was accompanied by deepening from middle to outer neritic depths.

Neritic Macroid Genesis, an Ecological Approach

Neritic coated grains of macroid size grow below the tidal zone over restricted surfaces of the sea floor reflecting thus the narrowness of the equilibria conditioning their genesis. As the growth of the grains is a time dependent process, the abiotic and biotic factors involved in the genesis of coated grains must be time-dependent also. The equilibria between the factors are therefore dynamic.

Occurrence of rhodolites in the tropical Pacific — a consequence of Mid-Miocene paleo-oceanographic change

Abstract Rhodolites occurring over wide areas of the tropical Pacific (Solomons, Loyalties, Vanuatu and Australes) are dated in many places by diagnostic larger foraminifera as of Middle Miocene age. They are preceded in Early Miocene and succeeded in Late Miocene by hermatypic coral deposits. The processes linking this facies change with time to paleo-oceanographic events documented in deep-sea sediments are identified as sea-level rise drowning the reefs, a slight drop of winter surface water temperature and an increase of the fertility of surface waters inhibiting compensatory growth of hermatypic corals until sea-level fall restored the earlier, original conditions of deposition.

The foraminiferal genera Pararotalia, Neorotalia , and Calcarina : taxonomic revision

-. 1977. Calcareous Algae. Developments in Palaeontology and Stratigraphy, 4. Elsevier, New York, 185 p. ., N. P. JAMES, AND R. N. GINSBURG. 1974. The puzzling Paleozoic phylloid algae--Holocene answer in squamariacean calcareous red algae. American Association of Petroleum Geologists, Annual Meeting, 2:82-83. ZHANG YUN. 1989. Multicellular thallophytes with differentiated tissues from late Proterozoic phosphate rocks of South China. Lethaia, 22:113-132.

Late cretaceous, larger, complex miliolids (foraminifera) endemic in the Pyrenean faunal province

SummaryThe species of four separate phyla,Periloculina, Pseudolacazina, elongateLacazina and compressedLacazina are revised and illustrated. By their common, pillared endoskeleton and miliolid coiling, they represent a common, single Late Cretaceous branch of the Fabulariidae endemic in the Pyrenean faunal province. Alveolinidae are represented in this province only by two unconnected genera,Helenalveolina n. gen. andSubalveolina, the latter closely related to American groups of larger porcelaneous foraminifera. They are interpreted as separate endemic offspring of streptospiral stem miliolids.ZusammenfassungDie Arten von 4 parallelen milioliden Phyla,Periloculina, Pseudolacazina, länglichenLacazina und abgeflachtenLacazina werden revidiert und abgebildet. Auf Grund ihres gemeinsamen, gepfeilerten Endoskeletts und ihrer milioliden Kammeranordnung, wo die Foramina in einer Achse senkrecht zu den (oder der) Spiralachse liegen, werden sie einem gemeinsamen Ast des Milioliden-Stammbaums innerhalb der Fabulariidae zugerechnet. Dieser ist auf die Oberkreide und auf die Faunenprovinz der Pyrenäen beschränkt und deshalb als echt endemisch zu bezeichnen. In der gleichen Faunenprovinz erscheinen in der Oberkreide auch Vertreter der Alveolinidae,Helenalveolina n. gen. undSubalveolina. Letztere ist mit Oberkreide-Alveolinen der benachbarten Faunenprovinz im karibischen Raum verwandt, beide werden als endemische Abkömmlinge strepto-spiraler, einfacher “Stamm”-Milioliden aufgefaßt.ResumenLa provincia faunística pirenaica que durante el Santoniense y Campaniense se extendía desde la plataforma cantábrica hasta el Golfo de Marsella, llegando hacia el sur hasta el borde norte de las cordilleras Béticas, contiene miliólidos complejos pertenecientes a cuatro líneas filéticas paralelas,Periloculina, Pseudolacazina, Lacazina alargadas yLacazina comprimidas. Su endoqueleto común formado por pilares i su enrollamiento miliólido ligado a aberturas circulares o trematoporos permite situarlos en un tronco único de Fabulariidae del Cretácico superior, endémicos de la provincia faunística pirenaica. Los Alveolínidos representados en esta misma provincia estan limitados a dos géneros sin relaciones mútuas,Helenalveolina ySubalveolina. Ambos son interpretados como descendientes endémicos paralelos de miliólidos con enrollamiento streptospiral.

ARCHAIASINIDS AND RELATED PORCELANEOUS LARGER FORAMINIFERA FROM THE LATE MIOCENE OF THE DOMINICAN REPUBLIC

Abstract Exceptionally large quantities of outstandingly well-preserved, free specimens of larger foraminifera from late Miocene sediments of the Dominican Republic invite an analysis of their structure in detail. The structures of the porcelaneous larger foraminifera reveal that most of them are not candidates for a direct ancestry of the species living today in the Caribbean. Although the late Miocene period has produced Caribbean endemists, in particular within the agglutinated group of the textulariellids and the lamellar-perforate group of the amphisteginids, the porcelaneous archaiasines and soritines are more closely related to the early Miocene forms of the Neotethys than to the Recent Caribbean endemists. These relationships are derived from their relative structural similarity and call for the proposition of appropriate additional taxa on the generic and specific levels. Miocene Miarchaias new genus develops several centimeters large, cyclical agamonts with meandropsinid structures covering the lateral surface of the disc (M. meander new species) whereas species of smaller shell size do not have cyclical generations (M. modestus new species). On the other hand, populations of cyclical schizonts and/or gamonts exhibit structures similar to the Recent, spiral Androsina: Androsinopsis radians new genus and species. The other new taxa erected here, Annulosorites spiralis new genus and species and Cyclorbiculina miocaenica new species, reflect differences in the apertural face and the respective arrangement of radial partitions as used to differentiate Recent Sorites from Amphisorus. Specimens to be attributed to the genera Cycloputeolina and Parasorites are present in the late Miocene of the Dominican Republic. They exhibit an exoskeleton in contrast to true soritids, and will need an eventual worldwide revision on the species level.

Paleogene larger rotaliid foraminifera from the western and central Neotethys

Part I The rotaliid foraminifera 1 Rotaliid shell architecture and the palaeodiversity of the Lockhartia Sea 1.1 Lamellation theory (Smout 1954 Hansen 1999) 1.2 Elements of rotaliid architecture 1.3 Life strategies: an overview 1.4 Cyclical community maturation 1.5 Diversity in the Lockhartia Sea 2 The system of the Rotaliidae, an overview 2.1 Overview 2.2 Superfamily Rotaliacea Ehrenberg: family Rotaliidae Ehrenberg, 1839 2.3 Identification key to the Paleogene genera of the superfamily Rotaliacea 2.4 Identification key to some genera excluded from the Rotaliacea 2.5 Identification key for some rotaliids with single foramina and lacking umbilical plugs or umbos 2.6 Identification key for some rotaliid shells with multiple areal foramina 2.7 Identification key for some rotaliid shells of the family Victoriellidae Part II Systematic palaeontology: Family Rotaliidae 3 Subfamily Rotaliinae Ehrenberg, 1839 3.1 Rotorbinella Bandy, 1944 3.2 Pyrenorotalia Boix et al., 2009 3.3 Rotospirella n. gen. 3.4 Rotalia Lamarck, 1804 3.5 Medocia Parvati, 1971 4 New subfamily Redmondininae 4.1 Redmondina Hasson, 1985 4.2 Slovenites n. gen. 4.3 Rotaliconus Hottinger, 2007 4.4 Pachyrotalia n. gen. 5 New subfamily Lockhartiinae 5.1 Rotalispira n. gen. 5.2 Lockhartia Davies, 1932 5.3 Dictyoconoides Nuttall, 1925 5.4 Sakesaria Davies, 1937 5.4.1 Additional species or varieties of Sakesaria 6 New subfamily Kathininae 6.1 Kathina Smout, 1954 6.2 Dictyokathina Smout, 1954 6.3 Plumokathina n. gen. 7 New subfamily Daviesininae 7.1 Daviesina Smout, 1954 8 Some taxa that are or remain excluded from the family Rotallidae 8.1 Neorotalia Bermundez, 1952 8.2 Paralockhartia n. gen. 8.3 New subfamily Laffitteininae 8.3.1 Laffitteina Marie, 1946 8.3.2 Cuvillierina Debourle, 1955 8.3.3 Smoutina Drooger, 1960 8.3.4 Storrsella Drooger, 1960 9 Rotaliid taxa with uncertain affinities 9.1 Rotaliid taxa without umbilical fills 9.1.1 Thalmannita Bermundez, 1952 9.1.2 Civrieuxia Bermundez, 1978 9.2 Rotaliid taxa with multiple foramina 9.2.1 Scarificatina Moorkens, 1982 9.2.2 Cincoriola Haque, 1958 9.2.3 Rahaghia n. gen. 9.3 Some rotaliids of the family Victoriellidae Chapman and Crespin, 1930 9.3.1 Gyroidinella Le Calvez, 1949

Partitions and Fistulose Chamberlets in Textulariina

Representatives of the genera Spirotextularia, Plotnikovina, Siphoniferoides and Sahulia possess fistulose chamberlets, formed by the outer pavement and separated from the main chamber lumen by a partition which is always perforated by parapores in both solid-walled and in paraporous genera. In some species fistulose chamberlets are replaced during ontogeny by elongated chamber lobes. In certain species of Sahulia irregular cavities are produced between paraporous wall and pavement. Lobes and cavities probably serve the same function as fistulose chamberlets. Forms with fistulose chamberlets appeared during the Cretaceous and seem characteristic of well-oxygenated, warm, normal to hypersaline marine environments. The function of parapores and of the chamberlets is unknown; it may be connected with uptake of dissolved organic matter by diffusion.