Clavator nodosus

Name

Clavator nodosus

Rank

Species

Generic Name

[Genus] Clavator

Authors (Pub.)

Peck R. E.  

Publication

North American Mesozoic Charophyta [1957/8]

Journal

Professional Papers / United States Geological Survey

Volume

294

Issue

A

Page number

15

Year

1957

Parent Taxon

[Genus] Clavator

Fossil Status

gyrogonites

Stratigraphy

Aptian

Location

Lower half of the Lakota sandstone, Fall River County, S. Dakota, USA

Paleoregion

America (North)

Data for Holotypus

Repository

U.S. Geological Survey, Denver, USA

Repository Number

558

Diagnosis

Utricles well developed and persistent; strongly nodose in the distal half or two-thirds, furrowed in proximal part around basal opening; and ranging from 700/* to 900/A in length and 500/* to 650/* in maximum width. Gyrogonites ovoid, fairly smooth, about 700/* long and 500/x wide, strongly beaked by abrupt upturn of spiral units at their distal ends, calcification thin with only outer wall calcified in many specimens. Spirals gently convex with intervening narrow intercellular furrows. Vegetative parts normal for genus. Central tube slightly more than half the diameter of internode and surrounded by 12 cortical tubes that appear to be continuous from node to node. On well-preserved specimens clusters of small spine cells completely cover exterior of internodes. Internodes increase in diameter as they approach the node. Six branchlets borne at each node.