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Volvocaceae

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Title: Volvocaceae  
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Volvocaceae

Volvocaceae
Gonium pectorale
Scientific classification
Kingdom: Plantae
Division: Chlorophyta
Class: Chlorophyceae
Order: Volvocales
Family: Volvocaceae
Genera

Colemanosphaera
Eudorina
Pandorina
Platydorina
Pleodorina
Volvox
Volvulina
Yamagishiella

The Volvocaceae are a family of unicellular or colonial biflagellates, including the typical genus Volvox. The family was named by Ehrenberg in 1834, and is known in older classifications as the Volvocidae.

Contents

  • Description 1
  • Notes 2
  • References 3
  • External links 4

Description

The simplest of the Volvocaeans are ordered assemblies of cells, each similar to the related unicellar protist mitosis.[1]

Volvox sp.

Other genera of Volvocaceans represent another principle of biological development as each organism develops differented cell types. In Pleodorina and Volvox, most cells are somatic and only a few are reproductive. In Pleodorina californica a colony normally has either 128 or 64 cells, of which those in the anterior region have only a somatic function, while those in the posterior region can reproduce; the ratio being 3:5. In Volvox only very few cells are able to reproduce new individuals, and in some species of Volvox the reproductive cells are derived from cells looking and behaving like somatic cells. In V. carteri, on the other hand, the division of labor is complete with reproductive cells being set aside during cell division, and they never assume somatic functions or develop functional flagella.[1]

Thus, the simplest Volvocaceans are colonial organisms but others are truly multicellular organisms. Larger volvocaceans have evolved a specialized form of diploid zygote (zygospore) capable of surviving in harsh environments. Once conditions have improved the zygospore germinates and undergoes meiosis to produce haploid offspring of both mating types.[1]

Notes

  1. ^ a b c Scott 2000

References

External links

  • (Research on Volvox carteri)


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