| 释义 |
Definition of foraminifer in English: foraminifernounPlural foraminifers, Plural foraminifera ˌfɒrəˈmɪnɪfəˌfär- Zoology A single-celled planktonic animal with a perforated chalky shell through which slender protrusions of protoplasm extend. Most kinds are marine, and when they die thick ocean-floor sediments are formed from their shells. Order Foraminiferida, phylum Rhizopoda, kingdom Protista See also globigerina Example sentencesExamples - It has been estimated that a large 150 micron wide shell of a foraminifer may take as long as 10 days to sink to the bottom of the ocean, whereas smaller ones would probably take much longer.
- In a Swedish fjord sediment where G. pseudospinescens is the dominant foraminifer, the intracellular nitrate pool in this species accounted for 20% of the large, cell-bound, nitrate pool present in an oxygen-free zone.
- These taxa consist of a broad array of organisms, including foraminifers, corals, bryozoans, mollusks, echinoderms, and fish.
- The Gracisce packstones contain a rich foraminiferal assemblage, composed of larger and planktonic foraminifera along with authigenic glauconite.
- Far from land in the deep sea, where little material comes from erosion of the land, the bottom sediment is made up mainly of shells of planktonic organisms, especially foraminifera.
Derivatives adjective ˌfɒrəmɪˈnɪf(ə)rəl Zoology Simulated foraminiferal shells based on the moving-reference model indicate that their variety is much wider than for morphotypes developed by fixed-reference models. Example sentencesExamples - The Gracisce packstones contain a rich foraminiferal assemblage, composed of larger and planktonic foraminifera along with authigenic glauconite.
- The basal stromatolite beds at both of the present localities contain large numbers of the foraminiferal disaster taxa Rectocornuspira kalhori and Earlandia sp. to the near exclusion of other forms.
- Furthermore, foraminiferal growth is often strongly allometric, and in many foraminifers the shape of the chamber changes during ontogeny.
- Depending on the group, a foraminiferal shell may be made of organic compounds, sand grains and other particles cemented together, or secreted crystalline calcium carbonates.
noun & adjective ˌfɒrəmɪˈnɪf(ə)rən Zoology For example, the pink sands of Bermuda get their color from the shells of a foraminiferan called Homotrema rubrum which has pink to red-colored shells. Example sentencesExamples - Tube walls have simple pores and are constructed of radiolarian and foraminiferan tests, sand grains and/or fragments of sponge spicules, connected by a cement of some kind.
- Thus, although mollusks and foraminiferans of the area have been studied extensively, additional collecting is necessary to fully describe the brachyuran fauna.
- If these sediments become cemented together, they form foraminiferan limestone that is exposed in cliffs and often creates overhanging ledges that provide excellent habitat for fish.
- These zooxanthellae may be found in many marine invertebrates, including sponges, corals, jellyfish, and flatworms, as well as within protists, such as ciliates, foraminiferans, and colonial radiolarians.
adjective ˌfɒrəmɪˈnɪf(ə)rəs Zoology While a wide variety of tactile surfaces may be used for this purpose, a preferred surface 40 is foraminiferous. Example sentencesExamples - Sediments along the crest and the northern slope consist of foraminiferous ooze with vertical extents of up to 800m.
- The marl and limestone of the Douara Basin are dense and commonly foraminiferous.
- ‘Undoubtedly,’ says our author, ‘if we could see it acting in its entirety, the ant-colony would resemble a gigantic foraminiferous Rhizopod, in which the nest would represent the shell, the queen the nucleus, the mass of ants the plasmodium and the files of workers, which are continually going in and out of the nest, the pseudopodia.’
- These islands, formed of old-reef and foraminiferous limestone, have experienced considerable uplift relative to sea level.
Origin Mid 19th century: from Latin foramen, foramin- (see foramen) + -fer 'bearing' (from ferre 'to bear'). Definition of foraminifer in US English: foraminifernounˌfär- Zoology A single-celled planktonic animal with a perforated chalky shell through which slender protrusions of protoplasm extend. Most kinds are marine, and when they die, their shells form thick ocean-floor sediments. Order Foraminiferida, phylum Rhizopoda, kingdom Protista See also globigerina Example sentencesExamples - In a Swedish fjord sediment where G. pseudospinescens is the dominant foraminifer, the intracellular nitrate pool in this species accounted for 20% of the large, cell-bound, nitrate pool present in an oxygen-free zone.
- It has been estimated that a large 150 micron wide shell of a foraminifer may take as long as 10 days to sink to the bottom of the ocean, whereas smaller ones would probably take much longer.
- The Gracisce packstones contain a rich foraminiferal assemblage, composed of larger and planktonic foraminifera along with authigenic glauconite.
- These taxa consist of a broad array of organisms, including foraminifers, corals, bryozoans, mollusks, echinoderms, and fish.
- Far from land in the deep sea, where little material comes from erosion of the land, the bottom sediment is made up mainly of shells of planktonic organisms, especially foraminifera.
Origin Mid 19th century: from Latin foramen, foramin- (see foramen) + -fer ‘bearing’ (from ferre ‘to bear’). |