Radiolarians and foraminifera are both protozoa, and they belong to the phylum Protozoa of Sarcopodia. In addition to Sarcopoda, protozoa include Flagellates, Ciliates, and Sporozoa.
Protozoa are the lowest animals in the animal kingdom. Their bodies are only composed of a single cell. The individuals are very tiny, generally less than a quarter of the size. One millimeter. But this small single cell is a complete living entity that can live independently and has the main life functions of an animal. Each part of the cell differentiates to form a structure called an "organoid". Perform various functions. For example, protozoa often have flagella, cilia or pseudopods as their locomotion organs.
Most protozoa live in the ocean or fresh water. Some species live in moist soil, and some live parasitic life.
So far, no fossil species have been found in the class Giardia and Sporozoa. Many fossils of Tintinella, a large category in the class Ciliates, have been discovered.
The bodies of tintinids are usually conical or trumpet-shaped, and the cells grow in a In a rather delicate bottle-shaped hard shell, the cells have a wide front end and a feather-like membrane around the edge as a motor organ. Tintin worms live planktonic and are widely distributed in the photic zone of all oceans. Only a few species live in freshwater waters. Due to their sensitivity to seawater temperature and salinity, modern Tintinella populations have formed different combinations in polar regions, temperate zones, subtropics, tropical seas, as well as estuaries, lakes and swamps.
The shell of a tintin worm is called dinga. The shell wall is usually composed of pseudochitin or organic matter secreted by cells and foreign minerals. Particles and biohard shells are cemented together. The shape of Dingjia varies from species to species, including bell-shaped, spherical, cone-shaped, bottle-shaped, nail-shaped or bullet-shaped, etc.
Tintinid fossils are mainly preserved in limestone, but some also appear in marl, black silica, shale, glauconite clay and peat. Fossil records show that tintinids first appeared in the Silurian Period, and were more abundant from the Jurassic to the Cretaceous. After the Late Cretaceous, no fossils appeared, but in modern times they are extremely prosperous. It is really mysterious.
animal tags： Tintinaria Radiolaria Foraminifera Protozoa
you may also like
Recently, Nature Ecology & Evolution, a subsidiary journal of Nature magazine, published a study independently completed by the Institute of Vertebrate Paleontology and Paleoanthropology of the Chinese Academy of Sciences on the independent evolution of the skull and body of early birds. Li Z...
Algae are the lower types of the plant kingdom. There are many kinds of them, with an estimated 18,000 species, belonging to green algae, diatoms, golden algae, red algae and brown algae. They are widely distributed in various waters on the earth. Algae have a cell wall c...
Modern whales have smooth skin and streamlined body shapes. Their huge tails create huge waves in the sea water, pushing their bodies to swim freely in the sea. But did you know that in the distant geological time, whales were once terrestrial animals with well-developed limbs? The discovery...
"Nature" (Nature) sub-journal "Nature Ecology & Evolution" (Nature Ecology & Evolution) published online on September 4, Zhu Min's team from the Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, on the fish landing New progress in t...
As early as the late Triassic, when dinosaurs had just entered the evolutionary stage, a group of small animals that were inconspicuous at the time differentiated from therodonts among therapsid reptiles. They were born at the wrong time, because in the long years from the Jurassic to the Cre...
From the end of 1996 to the spring of 1997, many international news media rushed to report on the discovery of two primitive "bird" fossils in the Beipiao area of Liaoning Province, China-Confucius Birds and Sinosauropteryx. The shape of Confuciusornis has many similar fe...
In 1973, farmers in Heshui County, Gansu Province discovered a piece of white ivory while digging in the sand. After 35 days of excavation by the excavation team, all the fossils were finally exposed: it was the skeleton of an elephant, inserted diagonally in the sand, with its feet stepping on ston...
In a time long before the modern world knew the fearsome Komodo dragon, there existed another terrifying predator that roamed the ancient Earth: the Red Crocodile (Crocodilus ruber), a prehistoric beast with a striking resemblance to the Komodo dragon. These enormous reptiles were not only fearsome...
Email: jsset#163.com (change # to @) Please indicate your purpose of visit! Guangdong ICP No. 2022053326 XML| map| Chinese
