Globigerinida
The Globigerinina is a suborder of foraminiferans that are found as marine plankton. They produce hyaline calcareous Test (biology), 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'' Pelagic sediments, 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 o ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Globigerinoidea
Globigerinoidea is a superfamily of free-living, calcareous, planktonic foraminifera Foraminifera (; Latin for "hole bearers"; informally called "forams") are single-celled organisms, members of a phylum or class of amoeboid protists characterized by streaming granular ectoplasm for catching food and other uses; and commonly ...l protists that have lived in the open ocean since the Eocene. It is part of the suborder Globigerinina.Globigerinoidea
World Foraminifera Database, accessed 27 November 2018 test (biology), Tests are trochospiral but later chambers may be enveloping. walls are perforate with numerous small pores or fewer larger ones and the surface may be covered with narrow elongate monocrystalline spines. Apertures vary in position from interiomarginal to equatorial and may be relatively l ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Foraminifera
Foraminifera (; Latin for "hole bearers"; informally called "forams") are single-celled organisms, members of a phylum or class of amoeboid protists characterized by streaming granular ectoplasm for catching food and other uses; and commonly an external shell (called a "test") of diverse forms and materials. Tests of chitin (found in some simple genera, and Textularia in particular) are believed to be the most primitive type. Most foraminifera are marine, the majority of which live on or within the seafloor sediment (i.e., are benthic), while a smaller number float in the water column at various depths (i.e., are planktonic), which belong to the suborder Globigerinina. Fewer are known from freshwater or brackish conditions, and some very few (nonaquatic) soil species have been identified through molecular analysis of small subunit ribosomal DNA. Foraminifera typically produce a test, or shell, which can have either one or multiple chambers, some becoming quite elaborate in ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Globorotalioidea
The Globoroatioidea (Globorotaliacea in older classifications) constitutes a superfamily of Cenozoic plantonic foraminifera. It is part of the suborder Globigerinina.Globorotalioidea
World Foraminifera Database, accessed 27 November 2018 Globoroatioidea have trochospiral tests with rounded to carinate peripheries, the walls of which are of finely lamellar, perforate, of optically radial , with an inne ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Truncorotaloididae
Truncorotaloididae is a family of foraminifera belonging to the superfamily Globorotalioidea in the suborder Globigerinina and the order Rotaliida.Truncorotaloididae
World Foraminifera Database, accessed 27 November 2018 It is found in marine sediments from the middle to the upper