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Paramecium caudatum [1] is a species of unicellular protist in the phylum Ciliophora. [2] They can reach 0.33 mm in length and are covered with minute hair-like organelles called cilia. [3] The cilia are used in locomotion and feeding. [2] The species is very common, and widespread in marine, brackish and freshwater environments. [4] [5]
Animal remains found at the site include domestic cattle, sheep or goat, wild cat, wild donkey, warthog, gazelle, hare, baboon, and turtle. [15] Domestic cattle bones were also found in the lowest layers and perhaps date from the eighth millennium BP, providing some of the earliest known evidence of pastoralism in the Sahara. [ 8 ]
Paramecium (/ ˌ p ær ə ˈ m iː s (i) ə m / PARR-ə-MEE-s(ee-)əm, /-s i ə m /-see-əm, plural "paramecia" only when used as a vernacular name) [2] is a genus of eukaryotic, unicellular ciliates, widespread in freshwater, brackish, and marine environments. Paramecia are often abundant in stagnant basins and ponds.
An international team spent years digging them out from the side of a steep, rocky slope in the Ica desert, a region in Peru that was once underwater and is known for its rich marine fossils.
Paramecium bursaria is a species of ciliate found in marine and brackish waters. [1] It has a mutualistic endosymbiotic relationship with green algae called Zoochlorella.About 700 Chlorella cells live inside the protist's cytoplasm and provide it with food, while the Paramecium provides the algae with movement and protection. [2]
Nevada has a rich fossil record of plants and animal life spanning the past 650 million years of time. [1] The earliest fossils from the state are from Esmeralda County , and are Late Proterozoic in age and represent stromatolite reefs of cyanobacteria , amongst these reefs were some of the oldest known shells in the fossil record, the Cloudina ...
Afrocascudo is a controversial genus of extinct neopterygian fish, either an ancient loricariid catfish or a juvenile obaichthyid lepisosteiform of the genus Obaichthys. It is known from the Late Cretaceous Douira Formation (Kem Kem Group) of Morocco. The genus contains a single species, A. saharaensis, known from a partial articulated specimen.
Several synapomorphies support this hypothesis, such as the presence of: sclerotic ossicles, paired pectoral fins, a dermal skeleton with three layers (a basal layer of isopedin, a middle layer of spongy bone, and a superficial layer of dentin), and perichondral bone. [10] Other groups Other groups † Pteraspido-morphi (extinct)