Cyclotella pseudokansasica

Name

Cyclotella pseudokansasica

Rank

Species

Generic Name

[Genus] Cyclotella

Authors (Pub.)

Kociolek J. P. Khursevich G. K.  

Publication

Morphology of some fossil lacustrine centric species from the western United States assigned to the genus Cyclotella (Bacillariophyta), including four described as new [2013/8]

Journal

Phytotaxa

Volume

127

Issue

1

Page number

93

Year

2013

Fossil Status

valves

Stratigraphy

Miocene

Strat. comment

Chalk Hills Formation

Location

USGS Diatom Locality 5244, Owyhee County, Idaho, USA

Paleoregion

America (North)

Data for Holotypus

Repository

California Academy of Sciences, San Francisco, USA

Repository Number

Circled specimen on CAS Slide #381069, CAS Accession Number 602190

Num

61

Pub.

Morphology of some fossil lacustrine centric species from the western United States assigned to the genus Cyclotella (Bacillariophyta), including four described as new [2013/8]

Diagnosis

Valves are circular, nearly flat, 10–23 μm in diameter, with a well-defined border between the central area and the marginal alveolate zone. Central area with a variable number of irregularly arranged areolae. Marginal zone extending from 1/3 to 1/2 of the valve radius consists of alveolate striae fascicles, 8–12(14) in 10 μm, separated by hyaline interfascicles or costae. Striae fascicles are of equal length. They contain 3–4 rows of puncta, 40–60 in 10 μm. Alveoli are simple. Length of alveolar openings is not equal to the length of striae fascicles. Marginal fultoportulae with 3 satellite pores are located on every second–fourth costa separating alveolar openings internally. A single rimoportula occurs at one of the costae. Spines are present at the junction of the valve face and mantle at every interfascicle or costa.