Structure and Origin of the Vestimentiferan Trophosome (Annelida, Siboglinidae)

The anatomical and histological structure of the trophosome of the giant vestimentiferan Riftiapachyptila has been studied. The trophosome consists of longitudinally oriented cords. The cords of the trophosome intertwine, form diverticula and anastomose with each other. Each cord has an axial blood...

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Bibliographic Details
Published in:Doklady. Biological sciences 2022-06, Vol.502 (1), p.42-45
Main Authors: Malakhov, V. V., Rimskaya-Korsakova, N. N., Gantsevich, M. M.
Format: Article
Language:English
Subjects:
Animals
Annelida
Biomedical and Life Sciences
Body wall
Capillaries
Evolutionary Biology
Life Sciences
Plant Sciences
Polychaeta
Sensory neurons
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Summary:The anatomical and histological structure of the trophosome of the giant vestimentiferan Riftiapachyptila has been studied. The trophosome consists of longitudinally oriented cords. The cords of the trophosome intertwine, form diverticula and anastomose with each other. Each cord has an axial blood vessel inside, which is connected to afferent vessels on the surface of the cord by radial capillaries. Based on the data on the structure and development of the trophosome, it is suggested that the evolutionary precursor of the trophosome was a blood network connecting the ventral and dorsal vessels. The cells of the coelomic lining on the surface of the vessels grew and gave rise to the parenchymal tissue of the trophosome. At the same time, the trophosome developed from two sources, namely: due to the coelomic lining on the surface of the vessels of the intestinal plexus and due to the coelomic lining on the surface of the vessels of the circulatory plexus of the body wall.
ISSN:0012-4966
1608-3105
DOI:10.1134/S0012496622010082