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Description of Arthracanthida

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Acantharea in which the bases of the spicules are pyramidal with 4-6 facets with or without basal extensions forming a more or less interlinked system. Endoplasm with numerous nuclei, pigments, inclusions and symbiotic Haptophyta. Thick capsular wall. Ectoplasm separated from endoplasm by a periplasmic cortex. Myonemes cylindrical, generally numerous. A few axopodia emerge between the spicules. Unlike the other Orders of Acantharia, gametogenesis occurs in a gamont which keeps the appearance of the trophont. The whole endoplasm is converted
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Arthracanthida

provided by wikipedia EN

Arthracanthida, a subclass of Acantharea, is a group of marine protozoans. They consist mainly of a gelatinous sheath filled with cytoplasm and a skeleton of up to 20 radially placed spicules made of celestine (strontium sulfate). While mostly found in the upper areas of the ocean, they are able to move vertically by using microfilaments attached to the spicules to expand and contract the sheath. They are plentiful in the Gulf Stream during the summer months, but little is known about their overall distribution.

References

  1. ^ WoRMS (2010). "Arthracanthida". World Register of Marine Species. Retrieved July 17, 2011.
  • L. H. Hyman, The Invertebrates, vol. 1, McGraw-Hill, 1940
  • T. Cavalier-Smith, Kingdom Protozoa and its 18 phyla, Microbiol. Rev., 57(4):953–994, 1993
  • K. Hausmann and N. Hulsmann, Protozoology, Georg Thieme Verlag, New York, 1996
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Arthracanthida: Brief Summary

provided by wikipedia EN

Arthracanthida, a subclass of Acantharea, is a group of marine protozoans. They consist mainly of a gelatinous sheath filled with cytoplasm and a skeleton of up to 20 radially placed spicules made of celestine (strontium sulfate). While mostly found in the upper areas of the ocean, they are able to move vertically by using microfilaments attached to the spicules to expand and contract the sheath. They are plentiful in the Gulf Stream during the summer months, but little is known about their overall distribution.

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