Pteromonas | |
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Scientific classification ![]() | |
Kingdom: | Plantae |
Division: | Chlorophyta |
Class: | Chlorophyceae |
Order: | Chlamydomonadales |
Family: | Phacotaceae |
Genus: | Pteromonas Seligo |
Type species | |
Pteromonas aculeata Seligo [1] | |
Species | |
Pteromonas is a genus of green algae in the family Phacotaceae. [2] It has a cosmopolitan distribution, [1] and mainly occurs in nutrient-rich freshwaters. [3]
Pteromonas is a unicellular, motile organism with two flagella; the protoplast of the cell is contained in a transparent, [4] flattened shell called a lorica. The two flagella emerge from separate openings in the anterior of the lorica. The lorica consists of two equal parts pressed together at their margins, forming a keel. The lorica is variously shaped, and may be undulate or spiny. The protoplast is pyriform, ovoid or globose and compressed. Cells contain a cup-shaped chloroplast with one or more pyrenoids and usually an stigma. Two contractile vacuoles are present at the base of the flagella. [1]
Asexual reproduction involves the division of the protoplast into two or four daughter cells, which are released when the two halves of the lorica separate. Sexual reproduction is isogamous; the two gametes fuse and develop into a globose zygote with a smooth cell wall. [1]
Species are distinguished based on the general morphology (size, shape and placement of "wings") of the lorica, and number and position of pyrenoids. [1]