pforams@mikrotax - Woodringina claytonensis pforams@mikrotax - Woodringina claytonensis

Woodringina claytonensis

Classification: pf_cenozoic -> Guembelitrioidea -> Guembelitriidae -> Woodringina -> Woodringina claytonensis
Sister taxa: W. hornerstownensis, W. claytonensis, W. sp.


Citation: Woodringina claytonensis Loeblich and Tappan 1957
Rank: Species
Basionym: Woodringina claytonensis
Taxonomic discussion: MacLeod (1993:92) described Woodringina kelleri as distinguished from Woodringina claytonensis by the former's "laterally compressed adult chambers, and ... its large elongate aperture that is surrounded by a well-developed discontinuous apertural rim;" however, the final chambers of both holotypes are similarly subglobular in edge and plan view (compare c, pl. IV: figs. 1-3 to Loeblich and Tappan, 1957b, pl. 39: fig. 1; see also Plate 13: Figures 6, 7). The only other figured specimen identified by MacLeod (1993) as W. kelleri also lacks laterally compressed chambers and closely resembles the W. claytonensis holotype in the shape of its final chambers (compare D'Hondt, 1991, pl. 2: fig. 4 to Loeblich and Tappan, 1957b, pl. 39: fig. 1). Comparison of the respective apertural characteristics of W. claytonensis and W. kelleri is complicated by the absence of W. claytonensis paratype specimens and the physical obstruction of the W. claytonensis holotype aperture. Nonetheless, the W. claytonensis holotype also appears to have a large elongate aperture surrounded by a well-developed, discontinuous apertural rim (Plate 13: Figure 7). The aperture of the W. kelleri holotype (Plate 13: Figure 8) does appear to be more centrally located than that of the W. claytonensis holotype. This difference appears insufficient to warrant maintenance of W. kelleri as a separate taxon, given the pronounced variability in position, height, and number of apertures exhibited by otherwise similar specimens in populations of Woodringina and other guembelitriid genera (i.e., Guembelitria and Parvularugoglobigerina). Hence, we consider Woodringina kelleri MacLeod, 1993, a junior synonym of Woodringina claytonensis Loeblich and Tappan, 1957. [Olsson et al. 1999]

Catalog entries: Woodringina claytonensis, Woodringina kelleri

Type images:

Distinguishing features:
Parent taxon (Woodringina): Tests contain an initial whorl of 3 chambers, later whorls of 2 chambers each. Test wall microperforate, marked by a guembelitriid surface texture (smooth walled or bearing perforate pustules). Aperture usually asymmetrically positioned and thin apertural lip infolded on one side.
This taxon: Test triserial initially then biserial, twisted with 5 or less chambers pairs. Apertural height appears to vary from high to low.

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.


Character matrix
test outline:Triangularchamber arrangement:Biserialedge view:Equally biconvexaperture:Terminal
sp chamber shape:N/Acoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
umb chbr shape:Inflatedumbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:N/Aumb depth:N/Awall texture:Finely pustuloseshell porosity:Microperforate: <1┬Ám
umbilical or test sutures:Moderately depressedfinal-whorl chambers:2.0-2.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution

Woodringina claytonensis was most abundant in low-latitude open-ocean assemblages (D'Hondt and Keller, 1991; Liu and Olsson, 1992). It was rare in high-latitude open-marine environments (Liu and Olsson, 1992). [Olsson et al. 1999]

Isotope paleobiology
The stable isotopic signature of this species suggests an affinity for relatively warm near-surface water masses (D'Hondt and Zachos, 1993). [Olsson et al. 1999]

Phylogenetic relations
This species is considered to have descended from Guembelitria cretacea (Olsson, 1970, 1982; Smit, 1977, 1982; D'Hondt, 1991; Li and Radford, 1991; Olsson etal., 1992; Liu and Olsson, 1992). D'Hondt (1991) and Liu and Olsson (1992) illustrated forms that are morphologically intermediate between Guembelitria cretacea Cushman, 1933, and Woodringina claytonensis Loeblich and Tappan, 1957. Such morphotypes are triserial in early whorls and biserial in later whorls (Guembelitria irregularis Morozova, 1961, of D'Hondt, 1991) (Plate 63: Figure 12; Plate 68: Figure 5). [Olsson et al. 1999]

Most likely ancestor: benthic ancestor - at confidence level 0 (out of 5). Data source: .
Likely descendants: Woodringina hornerstownensis; plot with descendants

Biostratigraphic distribution

Geological Range:
Notes: Basal Zone Pa to Zone Plb. [Olsson et al. 1999]
Last occurrence (top): within P1b subzone (63.90-65.25Ma, top in Danian stage). Data source: Olsson et al. 1999
First occurrence (base): within Pa zone (65.72-66.00Ma, base in Danian stage). Data source: Olsson et al. 1999

Plot of occurrence data:

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 86


Keller, G. (1988). Extinction, Survivorship, and Evolution across the Cretaceous/ Tertiary Boundary at El Kef. Marine Micropaleontology. 13: 239-263. gs

Loeblich, A. R. & Tappan, H. (1957a). Woodringina, a new foraminiferal genus (Heterohelicidae) from the Paleocene of Alabama. Journal of the Washington Academy of Sciences. 47: 39-40. gs

MacLeod, N. (1993). The Maastrichtian-Danian Radiation of Triserial and Biserial Planktic Foraminifera: Testing Phylogenetic and Adaptational Hypotheses in the (Micro)Fossil Record. Marine Micropaleontology. 21: 47-100. gs

Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. 1-252. gs


Woodringina claytonensis compiled by the pforams@mikrotax project team viewed: 25-3-2023

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