SemirossiaMichael Vecchione and Richard E. Young
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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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- Arms with biserial suckers.
- Greatly enlarged suckers in middle of arms II and III.
- Only left arm I hectocotylized.
- Clubs expanded.
- Club suckers in 5-8 series.
- Photophores present on ink sac. Click on an image to view larger version & data in a new window
Figure. Ventral view of anterior mantle cavity of Semirossia tenera. Arrow points to one of the two adjacent photophores. Photophores are directed anteriorly and are not strongly reflective in this side view. Photograph by M. Vecchione.
- Epirenal bodies apparently absent.
- Ink sac functional.
- Anal flaps well developed.
Verrill, A. E. 1880-1881. The cephalopods of the north-eastern coast of America. Part II. The smaller cephalopods, including the "squids" and the octopi, with other allied forms. Transactions of the Connecticut Academy of Sciences 5(6):259-446, 33 pls.
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- First online 01 September 2004
Citing this page:
Vecchione, Michael and Richard E. Young. 2004. Semirossia http://tolweb.org/Semirossia/20025/2004.09.01 in The Tree of Life Web Project, http://tolweb.org/. Version 01 September 2004 (under construction).