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![]() | Tristephanium dimensivum Haeckel 1887 | |||
![]() | Tristephanium octopyle Haeckel 1887 | |||
![]() | Tristephanium quadricorne Haeckel 1887 |
Current identification:
See also: Triostephus - Tristephanium was described as a sub-genus of Triostephus;
Original Description
Etymology:
Editors' Notes
The genus Tristephanium, and the three following genera derived from it, represent together the interesting subfamily of Trissocyclida (Prodromus, 1881, p. 446). These differ from all other Coronida in the possession of three complete rings, perpendicular to one another. The first of these is the vertical sagittal ring, the second the vertical frontal ring, and the third the horizontal basal ring. Since these three rings lie in the three dimensive planes, they are perpendicular to one another; and between them remain eight large open gates. Originally the four upper or lateral gates (corresponding to those of Zygostephanus) are much larger, the four lower or basal gates (corresponding to those of Semantrum) much smaller; but afterwards the latter may reach the size of the former, so that the basal ring becomes equatorial (in Trissocircus and Trissocyclus). The common ancestral form of the Trissocyclida (Tristephanium) may be derived directly either from Semantrum (by complete development of the frontal ring) or from Eucoronis (by complete development of four basal gates).
[Junior objective synonym of Triostephus Haeckel, 1881a]
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Tristephanium compiled by the radiolaria@mikrotax project team viewed: 21-5-2025
Short stable page link: https://mikrotax.org/radiolaria/index.php?id=263217 Go to Archive.is to create a permanent copy of this page - citation notes |
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