Trochiliscus bilineatus

Name

Trochiliscus bilineatus

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

113

Year

1934

Parent Taxon

[Genus] Trochiliscus

Fossil Status

gyrogonites

Stratigraphy

Frasnian

Location

Bird's Hill, southwest of Rockford, Iowa, USA

Paleoregion

Laurussia (Laurentia)

Data for Holotypus

Repository

University of Iowa, Iowa, USA

Repository Number

696

Diagnosis

Oogonium coronulate, subspherical, of medium size, ranging from 0.6 mm to 0.8 mm in height, width equal to height, greatest transverse diameter at or slightly below mid-height. Base and summit horizontally truncate, summit much more deeply than base. Ridges intercellular, nine, completing approximately a half turn around the oogonium, equatorial angle 25° to 30°. The ridges are of uniform width from base to summit, comparatively broad, each with a slight median groove. Cellular furrows narrow and deep. Coronula cells nine, deeply concave on outer surface, corresponding in position with the cellular furrows and forming an erect to suberect parapet-like ring around the large summit orifice, the inner surface of the coronula ring constituting a narrow funnel to the opening. Oospore membrane in some specimens greatly contracted.