foraminiferan

for·a·min·i·fer

F0242500 (fôr′ə-mĭn′ə-fər, fŏr′-) also fo·ram·i·nif·er·an (fə-răm′ə-nĭf′ər-ən)n. Any of numerous chiefly marine protozoans of the order (or phylum) Foraminifera, characteristically having a calcareous shell with perforations through which numerous pseudopods protrude. The shells accumulate on the ocean floor as sediment.

[From New Latin Forāminifera, order name : Latin forāmen, forāmin-, an opening + Latin -fer, -fer.]

fo·ram′i·nif′er·al adj.

foraminiferan

(fəˌræmɪˈnɪfərən) n (Zoology) a kind of protozoan with a calcareous, often perforated, shell

for•a•min•i•fer

(ˌfɔr əˈmɪn ə fər, ˌfɒr-)

n. any chiefly marine protozoan of the order Foraminifera, typically having a linear, spiral, or concentric shell perforated by small holes or pores through which pseudopodia extend. [1835–45; < New Latin Foraminifera < Latin foramen]

foraminiferan

(fərăm'ənĭf`ərən), common name for members of the class Foraminifera, large, shelled ameboid protozoansprotozoan
, informal term for the unicellular heterotrophs of the kingdom Protista. Protozoans comprise a large, diverse assortment of microscopic or near-microscopic organisms that live as single cells or in simple colonies and that show no differentiation into tissues.
..... Click the link for more information. belonging to the phylum Sarcodina. Most foraminiferan shells are calcareous, but some are siliceous, and others are built of sand grains. Initially, the shell contains a single chamber, and new chambers are added in a characteristic linear, spiral, or concentric series as the organism grows. Some shells reach several inches in diameter, but most species are less than a millimeter in diameter. Long, branching extensions of the cell (pseudopodia) reach from openings in the shell and fuse together to form a net in which plankton organisms are trapped. The net may cover an area 10 times the diameter of the shell, and crustaceans of 1 in. (2.5 cm) or more long may be caught by these much smaller protozoans.

A few foraminiferans live in freshwater or brackish water, but the majority are marine. They are found in all seas at all depths and are extremely abundant. Foraminiferans may be red, brown, or white in color. About 30 pelagic species live in the open sea, the most important belonging to the genus Globigerina.

Foraminiferans live near the water surface when young, but gravitate downward with age. When the animals die, the shells drop to the bottom, forming "globigerina ooze." Such ooze constitutes about half the sediments found on the roughly 50 million sq mi (130 million sq km) of ocean bottom that is covered with sediment in warm and tropical seas. Similar deposits in the past have contributed heavily to the formation of sedimentary rock, and the study of fossil foraminiferans has been extremely important in recognizing geological strata and for dating deposits. Layers of limestone or chalk, such as are found in Dover, England, and in Alabama and Mississippi, solidified from similar deposits of ooze in ancient seas. Foraminiferan fossils have been particularly useful in locating domes where petroleum deposits occur. Limestone used in some Egyptian pyramids contains skeletons of foraminiferans, especially of nummulites, which have coin-shaped skeletons.

Foraminiferans are classified in the phylum SarcodinaSarcodina,
the largest phylum (11,500 living species and 33,000 fossil species) of protozoans). It comprises the amebas and related organisms; which are all solitary cells that move and capture food by means of pseudopods, flowing temporary extensions of the cell.
..... Click the link for more information. , class Granuloreticulosa.

单词	foraminiferan
释义	foraminiferan for·a·min·i·fer F0242500 (fôr′ə-mĭn′ə-fər, fŏr′-) also fo·ram·i·nif·er·an (fə-răm′ə-nĭf′ər-ən)n. Any of numerous chiefly marine protozoans of the order (or phylum) Foraminifera, characteristically having a calcareous shell with perforations through which numerous pseudopods protrude. The shells accumulate on the ocean floor as sediment. [From New Latin Forāminifera, order name : Latin forāmen, forāmin-, an opening + Latin -fer, -fer.] fo·ram′i·nif′er·al adj. foraminiferan (fəˌræmɪˈnɪfərən) n (Zoology) a kind of protozoan with a calcareous, often perforated, shell for•a•min•i•fer (ˌfɔr əˈmɪn ə fər, ˌfɒr-) n. any chiefly marine protozoan of the order Foraminifera, typically having a linear, spiral, or concentric shell perforated by small holes or pores through which pseudopodia extend. [1835–45; < New Latin Foraminifera < Latin foramen] foraminiferan foraminiferan (fərăm'ənĭf`ərən), common name for members of the class Foraminifera, large, shelled ameboid protozoansprotozoan , informal term for the unicellular heterotrophs of the kingdom Protista. Protozoans comprise a large, diverse assortment of microscopic or near-microscopic organisms that live as single cells or in simple colonies and that show no differentiation into tissues. ..... Click the link for more information. belonging to the phylum Sarcodina. Most foraminiferan shells are calcareous, but some are siliceous, and others are built of sand grains. Initially, the shell contains a single chamber, and new chambers are added in a characteristic linear, spiral, or concentric series as the organism grows. Some shells reach several inches in diameter, but most species are less than a millimeter in diameter. Long, branching extensions of the cell (pseudopodia) reach from openings in the shell and fuse together to form a net in which plankton organisms are trapped. The net may cover an area 10 times the diameter of the shell, and crustaceans of 1 in. (2.5 cm) or more long may be caught by these much smaller protozoans. A few foraminiferans live in freshwater or brackish water, but the majority are marine. They are found in all seas at all depths and are extremely abundant. Foraminiferans may be red, brown, or white in color. About 30 pelagic species live in the open sea, the most important belonging to the genus Globigerina. Foraminiferans live near the water surface when young, but gravitate downward with age. When the animals die, the shells drop to the bottom, forming "globigerina ooze." Such ooze constitutes about half the sediments found on the roughly 50 million sq mi (130 million sq km) of ocean bottom that is covered with sediment in warm and tropical seas. Similar deposits in the past have contributed heavily to the formation of sedimentary rock, and the study of fossil foraminiferans has been extremely important in recognizing geological strata and for dating deposits. Layers of limestone or chalk, such as are found in Dover, England, and in Alabama and Mississippi, solidified from similar deposits of ooze in ancient seas. Foraminiferan fossils have been particularly useful in locating domes where petroleum deposits occur. Limestone used in some Egyptian pyramids contains skeletons of foraminiferans, especially of nummulites, which have coin-shaped skeletons. Foraminiferans are classified in the phylum SarcodinaSarcodina, the largest phylum (11,500 living species and 33,000 fossil species) of protozoans). It comprises the amebas and related organisms; which are all solitary cells that move and capture food by means of pseudopods, flowing temporary extensions of the cell. ..... Click the link for more information. , class Granuloreticulosa. MedicalSeeForaminifera
随便看	sticking our nose in where it's not wanted sticking our noses in sticking our noses in something sticking our noses in the air sticking our noses into something sticking our noses in where it isn't wanted sticking our noses in where it's not wanted sticking our noses up in the air sticking our noses where it isn't wanted sticking our noses where it's not wanted sticking our nose where it isn't wanted sticking our nose where it's not wanted sticking our oar in sticking our oar in something sticking our oar into something sticking our oars in sticking our oars in something sticking our oars into something sticking our tongues out sticking our tongues out at sticking out sticking out against sticking out a mile sticking out her tongue sticking out her tongue at