Classification Of Algae: Definition, Types

We discuss the Classification Of Algae in different ways – Algae primitive plants without blood vessels and no real roots. They produce spores instead of seeds, and most have sexual and asexual reproduction. Fungi are eukaryotic heterotrophic organisms that increase hype to form retaliated mycelia. They are not plants.

Algae and fungi have many characteristics and divided into several distinctions, categories, and orders, which we will discuss later in this article.

Algae Characteristics

Displays the following characters:

  • Singular algae photosynthetic organisms. They can complete 50% to 60% of all photosynthesis on the planet.
  • The sex organs in algae single-celled and not protected by the mother. On the other hand, the sexual organs of plants are multicellular, and the zygotes grow to form multicellular embryos. The fetus protected by parental tissue. –
  • Algae take many forms:
  • Some are single-cell.
  • Others are filamentous. Fibers made up of different cells or co-cells. Synergistic cells are multinomial structures and do not extend the walls.
  • Form of some all. They are multicellular. They highly branched and arranged in leaf-like extensions, such as seaweed. The body which cannot distinguish real roots stems and leaves and lacks xylem and phloem.
  • All algae contain photosynthetic pigments, green chlorophyll a, yellow and orange carotenoids. In addition to these pigments, some algae have other pigments, such as lutein and phycoerythrin. They are also important dyes for photosynthesis. Algae are classified according to their pigment composition.
  • Algae exhibit a variety of life cycles. With the exception of red algae (red algae), all algae can form flagella cells that may migrate at some stage of their life cycle.
  • Almost all algae are aquatic. They are present in a moist environment during active growth. They live in oceans, freshwater, ponds, lakes, rivers, hot springs, polar ice, moist soil, trees, and rocks.

Algae Classification

Classification of Algae

The Euglenoids

  • Previously, E-like insects were classified according to the plant kingdom (algae) and animal kingdom (protozoa). Molecular data suggest that carotenoids closely correlated with flagellates.
  • They are single-cell.
  • They have two flagella. One flagellum is long and the other is short.
  • Their pigments are like plants. Their pigments are chlorophyll a, chlorophyll b, and carotenoids. However, some photosynthetic eggs lose chlorophyll when they grow in the dark. They become heterotrophic and consume organic materials. Other types of eggs are always colorless and heterotrophic.
  • For example Euglena. Euglena has a special evolutionary significance. They are similar to plants and green algae because they have similar pigments. They are similar to animal flagellates (protozoa). Its believed that Eusealina the ancestor of plants and animals.


  • They are the most unusual organisms because they exhibit different structures.
  • Most flag bearers are unicellular.
  • Their cells often covered with shells. The shell composed of interlocking cellulose plates. Some silicates have also placed on these boards.
  • They have two flagella.
  • Their pigments are chlorophyll a, chlorophyll c, carotene, and fucoxanthin.
  • Ecologically, they are one of the important producer (plant) categories in marine ecosystems.
  • Dinosaurs occasionally explode or bloom. These flowers turn water into orange, red, or brown. Therefore, they also called red tides.
  • For example goniallax, cerium.


  • They usually single-celled.
  • He has no moving parts.
  • Their pigments are chlorophyll a, chlorophyll c, carotene, and fucoxanthin.
  • Each diatom has two spheres in its cell wall. These shells overlap and gather together. They look like Petri dishes. Silicon dioxide, a glass-like material, also accumulates in the shell. Materials like glass arranged in a complex pattern.
  • The aquatic ecosystem contains large amounts of diatoms. Therefore, they are the main producers of aquatic (marine and freshwater) ecosystems. Diatoms are very important in the aquatic food chain.
  • For example: Diatom, lasagna, Pinnularia.

Brown Algae

  • Brown algae include large Protista giants.
  • All brown algae are multicellular.
Brown Algae
  • They range in size from a few centimeters to 75 meters. The largest brown algae called kelp. Kelp looks tough and leathery. They have leaf-shaped leaves, stem-shaped stalks, and root-shaped fixtures.
  • They do not move, but their germ cells have two flagella.
  • Their pigments are chlorophyll a, chlorophyll c, carotene, and fucoxanthin.
  • Brown algae generally found in cooler seawater, especially on long coasts in the intertidal zone.
  • Examples: Focus, giant cell hyperplasia. The largest brown algae called kelp.

Red Algae

  • They are multicellular.
  • Their bodies made of intricately interwoven fibers. These fibers are delicate and feathery. Some red algae in flat cell sheets.
Red Algae
  • They are inactive. Most multicellular algae attach to rocks or other substances through the matrix.
  • Their pigments are chlorophyll a, carotene, and phycoerythrin (red pigment).
  • Some red algae incorporate calcium carbonate into the ocean’s cell walls. Together with coral animals, he participated in the construction of coral reefs.
  • Examples: ChondrusPolysiphonia.

Green Algae

  • They are unicellular, colonized, or multicellular.
  • Pigments of green algae are chlorophyll a, chlorophyll b, and carotenoids. These pigments are present in the chloroplast.
  • Most green algae contain flagella.
Green Algae
  • Cellulose occurs in the cell wall of green algae.
  • Chlorella has characteristics common to many plants. They have similar pigments, reserve products, and cell walls. Due to the similarity of the plants, it generally believed that the plants evolved from ancestral green algae. RNA sequencing of plants and green algae also supports this idea. This indicates that green algae and plants form a monophyletic lineage.
  • Examples are Chlamydomonas (unicellular algae), Desmids, Volvox (colonized algae), Spirulina (filamentous algae) Ulva (flaky multicellular bodies) and Chlorella.

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