Euglena Obtusa is a sort of single cell lash eukaryotic. It is the best known and most broadly contemplated individual from the class Euglenoidea. It is a differing bunch containing somewhere in the range of 54 genera.

Also, it has no less than 800 species. Types of Euglena are found in freshwater and salt water. But, they are frequently copious in calm inland waters where they may blossom in numbers adequate to shading the surface of lakes and trench green or red.

The species Euglena obtusa has been utilized broadly in the research facility as a model living being. Most types of Euglena have photosynthesizing chloroplasts inside the body of the cell.


This empowers them to encourage via autotrophy, similar to plants. But, they can also take food heterotrophically, similar to creatures. Since Euglena has highlights of the two creatures and plants, early taxonomists.

Although, they are working inside the Linnaean three-kingdom arrangement of natural characterization, discovered them hard to order. It was the topic of where to put such “unclassifiable” animals.

Besides, this incited Ernst Haeckel to include a third living kingdom (the fourth kingdom in all) to the Animale, Vegetabile (and Lapideum meaning Mineral) of Linnaeus: the Kingdom Protista.


Scientific NameEuglena Obtusa

Vernacular Names

Japanese: ユーグレナ


The history of this species is given below:


Types of Euglena were among the main protists to be seen under the magnifying instrument. In 1674, the Dutch pioneer of microscopy Antoni van Leeuwenhoek composed a letter to the Royal Society.

That he had gathered water tests from an inland lake, in which he discovered ‘animalcules’ that were ‘green in the center, and previously and behind white.’

Clifford Dobell views it as ‘relatively certain’ that these were Euglena Viridis, whose ‘particular plan of chromatophores…gives the lash this appearance at low amplification.’

Twenty-two years later, John Harris distributed a short arrangement of ‘Microscopical Observations’ announced that he had inspected ‘a little Drop of the Green Surface of some Puddle-Water’.

Also, he said that he observed it be ‘out and out made out of Animals of a few Shapes and Magnitudes.’ Among them, were oval animals whose center part was of a Grass Green, however each end Clear and Transparent.


These ‘would contract and widen themselves, tumble again and again ordinarily together, and afterward shoot away like Fish.’ In 1786, O.F. Müller gave a more total portrayal of the living being.

He named this as Cercaria Viridis, taking note of its particular shading and variable body shape. Müller also gave a progression of delineations, precisely portraying the undulating, contractile developments of Euglena’s body.

Fossil Records

In 1830, C. G. Ehrenberg renamed Müller’s Cercaria Euglena Viridis. He set it, with regards to the brief arrangement of grouping he imagined, among the Polygastrica in the family Astasiaea.

Multi-stomached animals with no nutritious trench, variable body shape yet no pseudopods or lorica. By making utilization of the recently imagined colorless magnifying instrument, Ehrenberg could see Euglena’s eyespot.

This was effectively distinguished as a simple eye in spite of the fact that he contemplated, wrongly, this implied the animal additionally had a sensory system.

This component was fused into Ehrenberg’s name for the new class, developed from the Greek roots “eu-” (well, great) and glēnē (eyeball, attachment of joint). Ehrenberg did not see Euglena’s flagella.

The first to distribute a record of this component was Félix Dujardin, who included “fiber flagelliforme” to the graphic criteria of the variety in 1841. Hence, the class Flagellata (Cohn, 1853) was made for animals.

This was similar to Euglena, having at least one flagella. While “Flagellata” has tumbled from use as a taxon, the idea of utilizing flagella as a phylogenetic foundation stays vivacious.

Distinctive Features

When eating as a heterotroph, Euglena takes in supplements by osmotrophy and can get by without the light on an eating regimen of the natural issue, for example, beef extract, peptone, acetic acid derivation, ethanol or sugars.

When there is adequate daylight for it to eat by phototrophy, it utilizes chloroplasts containing the colors chlorophyll A and chlorophyll B to create sugars by photosynthesis. Euglena’s chloroplasts are encompassed by three layers.


While those of plants and the green growth have just two films. This reality has been taken as morphological proof that Euglena’s chloroplasts developed from a eukaryotic green alga.

In this way, the captivating similitudes among Euglena and the plants would have emerged not in light of connection but rather in view of an optional endosymbiosis.

The atomic phylogenetic investigation has loaned support to this speculation, and it is currently for the most part acknowledged.

Morphology Of Euglena Obtusa

Euglena chloroplasts contain pyrenoids, utilized in the combination of paramylon, a type of starch vitality stockpiling empowering Euglena to survive times of light hardship.

The nearness of pyrenoids is utilized as a recognizing feature of the genus, isolating it from different euglenoids, for example, Lepocinclis and Phacus. All euglenoids have two flagella established in basal bodies.

They are situated in a little store at the front of the cell.  In Euglena, one flagellum is short, and does not project from the cell, while the other is moderately long, and regularly effectively noticeable with light microscopy.

In a few animal categories, the more extended, rising flagellum is utilized to enable the life form to swim. Like different euglenoids, Euglena have a red eyespot, an organelle made out of carotenoid color granules.

The red spot itself isn’t believed to be photosensitive. Or maybe, it channels the daylight that falls on a light-recognizing structure at the base of the flagellum, enabling just certain wavelengths of light to achieve it.

Euglena Obtusa

As the cell pivots concerning the light source, the eyespot somewhat hinders the source, allowing the Euglena to locate the light and push toward it (a procedure known as phototaxis).

Euglena Obtusa does not have a cell divider. Rather, it has a pellicle made up of a protein layer fed by a substructure of microtubules, masterminded in strips spiraling around the cell.

The activity of these pellicle strips sliding more than each other, known as metabolic, gives Euglena its remarkable adaptability and contractility. The system of this euglenoid development isn’t seen.

In low dampness conditions, or when nourishment is rare, Euglena Obtusa shapes a defensive divider around itself and untruths lethargic as a resting sore until the point when natural conditions move forward.

Ecology Of Euglena Obtusa

Ecology of Euglena is given below:


Euglena is found in calm lakes and puddles. It can make due in new and saltwater. In the event that appropriate daylight isn’t accessible, it goes around in water chasing for sustenance.


Corrosiveness and alkalinity can influence multiplication and life expectancies of Euglenozoans. Each group of Euglenozoans has an alternate life expectancy. Water temperature and chemistry range based on 20 samples.

Food Habits

Euglena Obtusa prepares its own food within the sight of daylight utilizing chlorophyll. But, without daylight, when it can’t set up its sustenance, it devours littler living beings.

For example, one-celled critter and paramecium. Its principle predators are young fish, young lizards, frogs, mussels, and other such life forms living in water.

Life Span Of Euglena Obtusa

It has a lifespan of about 3 weeks.


Euglena Obtusa duplicates abiogenetically through parallel splitting, a type of cell division. Generation starts with the mitosis of the cell core, trailed by the division of the cell itself.

Euglena Obtusa separates longitudinally, starting at the front end of the cell, with the duplication of flagellar procedures, neck and disgrace. By and by, cleavage frames in the foremost.

Also, a V-molded bifurcation bit by bit pushes toward the back, until the point that the two parts are completely isolated. Reports of sexual conjugation are uncommon and have not been substantiated.


Known Hazards

It is believed to be harmless and does not cause any diseases in large animals or human beings.

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Amna Shaheen

I have done Bachelors in Computer Software Engineering from Foundation University in 2017. Now, I am doing MS in Project Management and I am a blogger at TapeDaily. I am very passionate about plants and animals. I like to study about them, so I write blogs that are related to plants and animals.

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