Abstract
A number of embryological features of the Pogonophora suggest that they could not derive from the Polychaeta and are closely related to Deuterostomia. These are: (1) traces of spiral cleavage that sharply differ the from cleavage of polychaetes in the prospective value of blastomeres; (2) enterocoelic formation of mesoderm; (3) the larva most closely resembles Balanoglossus that has just completed metamorphosis; proto-, meso-, and metasoma of pogonophoran larva correspond (or are homologous) to the proboscis, collar, and trunk of Balanoglossus respectively; while the telosoma can be regarded as an organ appearing late in phylogenesis that serves to burrow into the bottom; (4) larvae of Siboglinum have a transitory mouth located, as it is the case in Enteropneusta, between proto-and mesosoma, very far from the posterior end, where there is closed blastopore; therefore, the former can be considered as a secondary mouth; (5) the asymmetrical development of the anterior pair of coeloms in Pogonophora, Echinodermata, and Amphioxus allows finding homologies between organs developing from these coeloms.
Similar content being viewed by others
References
Gureeva, M.A. and Ivanov, A.V., On the Origin of Coelomic Mesoderm in Oligobrachia mashikoi (Pogonophora), Zool. Zhurn., 1986, vol. 65, no. 5, pp. 780–788.
Ivanov, A.V., Observations On Embryonic Development in Pogonophora, Zool. Zhurn., 1975, vol. 54, no. 7, pp. 973–993.
Ivanov, A.V., On Some Results in the Studies of Pogonophora, Biol. Morya, 1980, no. 4, pp. 3–7.
Ivanov, A.V. and Gureeva, M.A., On Egg Cleavage in Oligobrachia mashikoi Imajima (Pigonophora), Dokl. AN SSSR, 1976, vol. 227, no. 6, pp. 1493–1495.
Ivanov, P.P., Primary and Secondary Metamerism of the Body, Zhurn. Obshch. Biol., 1944, vol. 5, no. 2, pp. 61–95.
Bakke, N., The Early Embryos of Siboglinum fiordicum Webb (Pogonophora) Reared in the Laboratory, Sarsia, 1976, vol. 60, pp. 1–11.
Callsen-Cencic, P. and Flugel, H., Larval Development and Formation of the Gut of Siboglinum poseidoni Flugel & Langhof (Pogonophora, Perviata), Sarsia, 1995, vol. 80, pp. 73–89.
Child, C.M., The Early Development of Arenicola and Sternaspis, Arch. Entw-mech., 1900, vol. 9, pp. 587–723.
Hatschek, B., Lehrbuch der Zoologie, Jena, 1888–1891.
Ivanov, A.V., Analysis of Embryonic Development of Pogonophora in Connection with the Problems of Phylogenetics, Z. Zool. Syst. Evol. Forsch., 1988, vol. 26, pp. 161–185.
Morgan, T., Growth and Metamorphosis of Tornaria, J. Morphol., 1891, vol. 5, pp. 407–458.
Southward, E.C., Development of the Gut and Segmentation of Newly Settled Stages of Ridgeia (Vestimentifera), J. Mar. Biol. Ass. U. K., 1988, vol. 68, pp. 465–487.
Webb, M., The Larvae of Siboglinum fiordicum and Reconsideration of the Adult Body Regions (Pogonophora), Sarsia, 1964, vol. 15, pp. 33–36.
Additional information
Original Russian Text © O.M. Ivanova-Kazas, 2007, published in Biologiya Morya.
The Editorial Board of “Biologiya Morya” would like to express sincere thanks to O.M. Ivanova-Kazas for kindly submitted this paper dedicated to the jubilee of Acad. A.V. Ivanov. The paper is published as is, without any changes.
Rights and permissions
About this article
Cite this article
Ivanova-Kazas, O.M. On the problem of the origin of Pogonophora. Russ J Mar Biol 33, 338–342 (2007). https://doi.org/10.1134/S1063074007050124
Received:
Issue Date:
DOI: https://doi.org/10.1134/S1063074007050124