pforams@mikrotax - Dipsidripella liqianyui

Dipsidripella liqianyui

Classification: pf_cenozoic -> Globigerinitidae -> Dipsidripella -> Dipsidripella liqianyui
Sister taxa: D. liqianyui, D. danvillensis, D. sp.

Eocene_Atlas_pl16-9_fig4-8.jpg
Eocene_Atlas_pl16-9_fig9-11.jpg
Eocene_Atlas_pl16-9_fig12-16-17.jpg
Eocene_Atlas_pl16-9_fig13-15.jpg

Taxonomy

Citation: Dipsidripella liqianyui Huber & Pearson, in Huber et al. 2006

Rank: Species

Basionym: Dipsidripella liqianyui

Synonyms:

?Globorotalia denseconnexa Subbotina, in Subbotina et al. 1960:67, pl. 13, fig. 3a-c (holotype); 4a-6c (topotypes) [upper Oligocene (Chattian), Polyanitsa Fm., Velikiy Lukavets River, Ciscarpathian region, Ukraine].
Testicarinata inconspicua (Howe). Stott and Kennett, 1990:560, pl. 7: figs. 13, 14 [late middle Eocene, ODP Site 869, Maud Rise, Waddell Sea]. [Not Howe, 1939.]
Planorotalites sp. 2, Huber, 1991:440, pl. 6: figs. 23-24 [lower Eocene Zone AP6a, ODP Hole 738C, Kerguelen Plateau, southern Indian Ocean].
Praetenuitella sp. 2, Huber, 1991:440, pl. 7: figs. 3, 4 [upper Eocene Zone AP12, ODP Hole 738B, Kerguelen Plateau, southern Indian Ocean].
Dipsidripella liqianyui Huber and Pearson, 2006 in Huber and others, 2006:501-502, pl. 16.9, figs. 1-3, 5-7, 9-17 [holotype and paratypes, middle to upper Eocene Zone AE8, ODP Hole 738B, Kerguelen Plateau, southern Indian Ocean], figs. 4, 8 [reillustration from Stott and Kennett, 1990, pl. 7, figs. 13, 14, upper Eocene Zone AE8, ODP Site 689, Weddell Sea, Antarctic Ocean]. [synonymy from Huber et al. 2006, updated from Pearson et al. 2018]

Taxonomic discussion: This species was described in the Atlas of Eocene Planktonic Foraminifera (Huber and others, 2006). Here we include Globorotalia denseconnexa Subbotina, 1960, in questionable synonymy (see Chapter 20, this volume). See under D. danvillensis for how to distinguish the two species. The highest known occurrence is in ODP Hole 738B where the range is truncated by a hiatus in Zone AP13 (lower Oligocene) in a sample that also contains Pseudohastigerina micra and is therefore equivalent to (sub)tropical Zone O1, probably the upper part (see Huber, 1991, Table 1). The precise extinction level has yet to be confirmed, and it is not known whether it preceded, followed, or was simultaneous with the extinction of D. danvillensis. [Pearson et al. 2018]

This new species is placed in Dipsidripella because of its finely perforate test, smooth, pustulose to hispid surface texture, and highly arched interiomarginal aperture. Because of its small size and thin shell wall this taxon is easily overlooked in microfossil assemblages and is prone to dissolution and recrystallization. As a result, its stratigraphic and geographic distribution have been incompletely documented and its taxonomic status cannot be firmly resolved until better preserved specimens are studied. Specimens that were described as Planorotalites sp. 1 and Praetenuitella sp. 2 by Huber (1991) from middle and upper Eocene chalk sediments at ODP Site 738 (Kerguelen Plateau) are now placed in D. liqianyui as they differ only in degree of evoluteness in coiling and axial compression of the test. [Huber et al. 2006]

Catalog entries: Dipsidripella liqianyui

Type images:

holotype: D. liqianyui
paratype: D. liqianyui

Distinguishing features: Like D. danvillensis but with more evolute test, less lobate axial periphery, more flattened spiral side, broader interiomarginal aperture, and without secondary accessory apertures.

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.

Description

Wall type: Finely perforate, surface hispid to moderately pustulose, pustules scattered on umbilical and spiral surfaces of test. [Huber et al. 2006]

Morphology: Test very small, equally biconvex to planoconvex, weakly lobate, circular to subcircular in equatorial outline, axial periphery rounded to slightly compressed; 5-7 subglobular chambers in the final whorl, sometimes becoming slightly reniform in the final whorl, coiled in a low trochospire, increasing gradually in size; sutures weakly depressed, radial to slightly curved on the spiral side, radial on umbilical side; umbilicus broad and shallow, often ornamented with a random scattering of pustules; aperture a subcircular extraumbilical-umbilical arch that is bordered by a narrow to moderately broad, equidimensional lip. [Huber et al. 2006]

Size: Holotype (USNM 523431) maximum diameter 0.10 mm, breadth 0.04 mm; Paratype (USNM 523432) maximum diameter 0.09•€Êmm, breadth 0.04 mm. [Huber et al. 2006]

Character matrix

test outline:	Subcircular	chamber arrangement:	Trochospiral	edge view:	Equally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Petaloid	coiling axis:	Low	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Subtriangular	umbilicus:	Wide	periph margin shape:	Moderately rounded	accessory apertures:	None
spiral sutures:	Weakly depressed	umb depth:	Shallow	wall texture:	Moderately pustulose	shell porosity:	Microperforate: <1µm
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	5.0-7.0	N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution: Identified only in the southern Indian Ocean at ODP Site 738 (Kerguelen Plateau) and Site 761 (Wombat Plateau). [Huber et al. 2006]

Isotope paleobiology: No data available. [Huber et al. 2006]

Phylogenetic relations: May have evolved from D. danvillensis during the middle Eocene. [Huber et al. 2006]

Most likely ancestor: Dipsidripella danvillensis - at confidence level 2 (out of 5). Data source: Huber et al. 2006.

Biostratigraphic distribution

Geological Range:
Notes: Middle Eocene Zone E11 through lower Oligocene Zone O1. [Huber et al. 2006]
Last occurrence (top): within O1 zone (32.10-33.90Ma, top in Rupelian stage). Data source: Huber et al. 2006
First occurrence (base): within E11 zone (40.40-41.89Ma, base in Lutetian stage). Data source: Huber et al. 2006

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Dipsidripella

Primary source for this page: Pearson et al. 2018 - Olig Atlas chap.16 p.434; Huber et al. 2006 - Eocene Atlas, chap. 16, p. 501

References:

Howe, H. V. (1939). Louisiana Cook Mountain Eocene foraminifera. Bulletin of the Geological Survey of Louisiana. 14: 1-122. gs

Huber, B. T. (1991c). Paleogene and Early Neogene Planktonic Foraminifer Biostratigraphy of Sites 738 and 744, Kerguelen Plateau (Southern Indian Ocean). Proceedings of the Ocean Drilling Program, Scientific Results. 119: 427-449. gs V O

Huber, B. T., Olsson, R. K. & Pearson, P. N. (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene microperforate planktonic foraminifera (Jenkinsina, Cassigerinelloita, Chiloguembelina, Streptochilus, Zeauvigerina, Tenuitella, and Cassigerinella) and Problematica (Dipsidripella). In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 41(Chap 16): 461-508. gs V O

Pearson, P. N., Wade, B. S. & Huber, B. T. (2018c). Taxonomy, biostratigraphy, and phylogeny of Oligocene Globigerinitidae (Dipsidripella, Globigerinita, and Tenuitella). In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 46(Chap 16): 429-458. gs V O

Stott, L. D. & Kennett, J. P. (1990). The Paleoceanographic and Paleoclimatic signature of the Cretaceous/Paleogene boundary in the Antarctic: Stable isotopic results from ODP Leg 113. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 829-848. gs

Subbotina, N. N., Pishvanova, L. S. & Ivanova, L. V. (1960). Stratigrafiya oligotsenovykh i miotsenovykh otlozheniy predkarpat'ya po foraminiferam. In, Subbotina, N. N. (ed.) Mikrofauna of the USSR XI. Trudy Vsesoyuznego Neftyanogo Nauchno-Issledovatel 'skogo Geologo-Razvedochnogo Instituta (VNIGRI). 153: 5-155. gs

Dipsidripella liqianyui compiled by the pforams@mikrotax project team viewed: 13-4-2021

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