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Hedbergellidae
Hedbergellidae is an extinct family of foraminifera belonging to the superfamily Rotaliporoidea and the suborder Globigerinina.Hedbergellidae World Foraminifera Database, accessed 27 November 2018 Genera The family contains the following genera: * Subfamily Hedbergellinae ** '' Asterohedbergella'' ** '' Costellagerina'' ** '' Fingeria'' ** '' |
Hedbergella
''Hedbergella'' is an extinct genus of planktonic foraminifera from the Cretaceous, described by Alfred R. Loeblich Jr, Loeblich and Helen Niña Tappan Loeblich, Tappan, 1961, as: Test free, trochospiral, biconvex, umbilicate, periphery rounded with no indication of keel or poreless margin; chambers globular to ovate; sutures depressed, radial, straight or curved; wall calcareous, finely perforate, radial in structure, surface smooth to hispid or rugose; aperture an interiomarginal, extraumbilical-umbilical arch commonly bordered above by a narrow lip or spatulate flap, ... Includes species otherwise similar to ''Praeglobotruncana'' but which lack a keel or poreless margin, hence is regarded as a separate genus rather than as a subgenus of ''Praeglobotruncana'' as by Banner and Blow (1959). ''Hedbergella'' was named by Brönnimann and Brown in 1958, and is included in the family Hedbergellidae and the suborder Globigerinina. ''Hedbergella'' ranges through most of the Cretaceous, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Globigerinina
The Globigerinina is a suborder of foraminiferans that are found as marine plankton. They produce hyaline calcareous tests, and are known as fossils from the Jurassic period onwards. The group has included more than 100 genera and over 400 species, of which about 30 species are extant. One of the most important genera is ''Globigerina''; vast areas of the ocean floor are covered with ''Globigerina'' ooze (named by Murray and Renard in 1873), dominated by the shells of planktonic forms. Description Globigerinids are characterized by distinctly perforate planispiral or trochospiral tests composed of lamellar radial hyaline (glassy) calcite, with typically globular chambers and single interiomarginal aperture. Some however have multiple or auxiliary apertures, and in some the aperture is areal or terminal in location. Some, also, have keels, reinforcing thickenings along exterior angles. An adaptation to the planktonic habit is the development of long narrow spines that support ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Praeglobotruncana
PraeglobotruncanaBermúdez, P.J. (1952). Estudio sistemático de los foraminíferos rotaliformes. Boletín de Geología, Venezuela, 2(4): 230 p. is an extinct genus of foraminifera belonging to the family Hedbergellidae of the superfamily Rotaliporoidea and the suborder Globigerinina.Praeglobotruncana World Foraminifera Database, accessed 27 November 2018 Its type species is '' Praeglobotruncana delrioensis''. Its fossil range is the Cretaceous Period
The Cretaceous ( ) is a geological period that lasted from about 145 to 66 millio ...
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Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the Latin ''creta'', "chalk", which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation ''Kreide''. The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now- extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was ice free, and forests extended to the poles. During this time, new groups of mammals and birds appeared. During the Early Cretaceous, flowering plants appeared and began to rapidly diversify, becoming the dominant group of plants across the Earth b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
