If you need an accessible version of this item please contact JSTOR User Support

On Chlorocruorin and Haemoglobin

H. Munro Fox
Proceedings of the Royal Society of London. Series B, Biological Sciences
Vol. 136, No. 884 (Oct. 19, 1949), pp. 378-388
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/82565
Page Count: 11
  • Download PDF
  • Cite this Item

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support
On Chlorocruorin and Haemoglobin
Preview not available

Abstract

Chlorocruorin is a dichroic red-green respiratory protein. It is chemically similar to haemoglobin, and is only found dissolved in the blood of certain marine annelid worms. Chlorocruorin is the characteristic blood pigment of the Serpulimorpha (serpulids and sabellids), but in the genus Serpula both chlorocruorin and haemoglobin are present together in the blood. This is the first time that two respiratory pigments have been found in the blood of one animal. Young individuals have relatively more haemoglobin, older ones more chlorocruorin. Within the serpulid genus Spirorbis, one species has chlorocruorin in its blood, another has haemoglobin, while a third has neither pigment. As their habitats are similar, no functional explanation for these differences suggests itself. The oxygen affinity of all chlorocruorins tested is considerably lower than that of most haemoglobins. But in Serpula the oxygen affinities of the chlorocruorin and haemoglobin are the same as one another. The carbon monoxide affinity of chlorocruorin (in Branchiomma) is higher than that of any haemoglobin. Although Serpulimorpha have chlorocruorin in their blood, the haem present in their tissues (muscles, eggs, sperm) is protohaem, not chlorocruorohaem. One genus, Potamilla, with chlorocruorin in its blood, has haemoglobin in the muscles. Chlorocruorin is known only from blood, and from the mucous tube of Myxicola; none has been found in cells. Coelomic fluid contains none. Protohaem is secreted into the protective tubes of both serpulids and sabellids. A protohaemochromogen is present in the gut fluid of serpulids, recalling that found in crustaceans and molluscs.

Page Thumbnails

  • Thumbnail: Page 
378
    378
  • Thumbnail: Page 
379
    379
  • Thumbnail: Page 
380
    380
  • Thumbnail: Page 
381
    381
  • Thumbnail: Page 
382
    382
  • Thumbnail: Page 
383
    383
  • Thumbnail: Page 
384
    384
  • Thumbnail: Page 
385
    385
  • Thumbnail: Page 
386
    386
  • Thumbnail: Page 
387
    387
  • Thumbnail: Page 
388
    388