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taxon links [down<--]Rotifera Interpreting the tree
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This tree diagram shows the relationships between several groups of organisms.

The root of the current tree connects the organisms featured in this tree to their containing group and the rest of the Tree of Life. The basal branching point in the tree represents the ancestor of the other groups in the tree. This ancestor diversified over time into several descendent subgroups, which are represented as internal nodes and terminal taxa to the right.

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You can click on the root to travel down the Tree of Life all the way to the root of all Life, and you can click on the names of descendent subgroups to travel up the Tree of Life all the way to individual species.

For more information on ToL tree formatting, please see Interpreting the Tree or Classification. To learn more about phylogenetic trees, please visit our Phylogenetic Biology pages.

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Relationships after Sørensen et al. 2005

Containing group: Rotifera


Ahlrichs, W. H. 1995. Ultrastruktur und Phylogenie von Seison nebaliae (Grube 1859) und Seison annulatus (Claus 1876). Cuvillier Verlag, Göttingen. 310 pp..

Ahlrichs, W. H. 1995. Seison annulatus und Seison nebaliae—Ultrastruktur und Phylogenie. Verhandlungen der Deutschen Zoologischen Gesellschaft 88:1-155.

Ahlrichs, W. H. 1997. Epidermal ultrastructure of Seison nebaliae and Seison annulatus, and a comparison of epidermal structures within Gnathifera.Zoomorphology 117:41–48.

Ahlrichs, W. H. 1998. Spermatogenesis and ultrastructure of the spermatozoa of Seison nebaliae (Syndermata). Zoomorphology 118:255–261.

Ferraguti, M. and G. Melone. 1999. Spermiogenesis in Seison nebaliae (Rotifera, Seisonidea): further evidence of a rotifer—acanthocephalan relationship. Tissue Cell 31:428–440.

Markevich, G. I. 1993. SEM observations on Seison and phylogenetic relationships of the Seisonidea (Rotifera). Hydrobiologia 255/256(1):513 - 520.

Ricci, C., G. Melone and C. Sotgia. 1993. Old and new data on Seisonidea (Rotifera). Hydrobiologia 255/256:495–511.

Segers, H. and G. Melone. 1998. A comparative study of trophi morphology in Seisonidea (Rotifera). Journal of Zoology 244:201–207.

Sørensen, M. V., P. Funch and H. Segers. 2005. On a new Seison Grube, 1861 from coastal waters of Kenya, with a reappraisal of the classification of Seisonida (Rotifera). Zoological Studies 44 :34–43.

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Citing this page:

Tree of Life Web Project. 2006. Seisonidea. Version 27 July 2006 (temporary). http://tolweb.org/Seisonidea/20453/2006.07.27 in The Tree of Life Web Project, http://tolweb.org/

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This page is a Tree of Life Branch Page.

Each ToL branch page provides a synopsis of the characteristics of a group of organisms representing a branch of the Tree of Life. The major distinction between a branch and a leaf of the Tree of Life is that each branch can be further subdivided into descendent branches, that is, subgroups representing distinct genetic lineages.

For a more detailed explanation of the different ToL page types, have a look at the Structure of the Tree of Life page.

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