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Trochiliscus septemcostatus
Trochiliscus septemcostatus R.E. Peck J. Paleontol., 8(2): 111. Jun 1934
- Name
- Trochiliscus septemcostatus
- 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
- 31003-2
- Diagnosis
- Oogonium coronulate, spherical, medium large, averaging about 0.8 mm in height, wider than high, with greatest transverse diameter near mid-height. Base horizontally truncate. Ridges cellular, seven, completing from a fourth to a third of a turn around the oogonium, equatorial angle 30° to 35°. The ridges are broad at the base, narrowing slightly near the summit, each with a broad, shallow median groove. Intercellular furrows wide and deep. Coronula cells seven, deeply concave on outer surface, corresponding in position with the cellular ridges and forming a suberect parapet-like ring around the summit orifice, the inner surface of the coronula ring constituting a broad funnel to the opening. Oospore membrane unknown.
