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Trochiliscus octocostatus
Trochiliscus octocostatus R.E. Peck J. Paleontol., 8(2): 111. Jun 1934
- Name
- Trochiliscus octocostatus
- Rank
- Species
- Generic Name
- [Genus] Trochiliscus
- Authors (Pub.)
- Peck R. E.
- Publication
- The North American Trochiliscids, Paleozoic Charophyta [1934/6]
- Journal
- Journal of Paleontology
- Volume
- 8
- Issue
- 2
- Page number
- 111
- Year
- 1934
- Parent Taxon
- [Genus] Trochiliscus
- Fossil Status
- gyrogonites
- Stratigraphy
- Tournaisian
- Location
- Williamsburg, Missouri, USA
- Paleoregion
- Laurussia (Laurentia)
Data for Holotypus
- Repository
- University of Missouri, St. Louis, USA
- Repository Number
- 31002-2
- Diagnosis
- Oogonium coronulate, subspherical, large, ranging from 0.7 mm to 1.0 mm in height, wider than high, with greatest transverse diameter at or slightly below mid-height. Base and summit horizontally truncate, summit more deeply than base. Ridges cellular, eight, completing from a fourth to a half turn around the oogonium, equatorial angle from 35° to 40°. The ridges are broad and flat or slightly concave near the base and become more narrow and convex toward the summit. Intercellular furrows narrow or of medium width, and shallow. Coronula cells eight, deeply concave on outer surface, corresponding in position with the cellular ridges and forming an erect to suberect parapet-like ring around the large summit orifice, the inner surface of the coronula ring constituting a broad funnel to the opening. Oospore membrane usually contracted, sometimes folded, but occasionally in contact with the inner wall of the oogonium.
