Parvularugoglobigerina eugubina


Classification: pf_cenozoic -> Guembelitrioidea -> Guembelitriidae -> Parvularugoglobigerina -> Parvularugoglobigerina eugubina
Sister taxa: P. eugubina, P. extensa, P. alabamensis, P. sp.,

Taxonomy

Citation: Parvularugoglobigerina eugubina (Luterbacher and Premoli Silva 1964)
Rank: Species
Basionym: Globigerina eugubina
Synonyms:
Taxonomic discussion: Premoli Silva and Bolli (1973) declared Globigerina umbrica Luterbacher and Premoli Silva, 1964, and Globigerina sabina Luterbacher and Premoli Silva, 1964, to be junior synonyms of Globigerina eugubina Luterbacher and Premoli Silva, 1964. This broadened the concept of eugubina to include moderately spired forms with 4V2 chambers in the final whorl (Globigerina sabina) and forms with 7 chambers in the final whorl (Globigerina umbrica). We also include in this broadened concept Globigerina anconitana Luterbacher and Premoli Silva (1964), a species that was described from the same assemblage as these species. Smit (1982) first noted that Globorotalia longiapertura Blow, 1979, is a junior synonym of Globigerina eugubina Luterbacher and Premoli Silva. [Olsson et al. 1999]

Following Premoli Silva and Bolli (1973) and Smit (1982), we treat several intergrading morphotypes as variants of P. eugubina (Plates 66, 67). These include a moderately spired form with 4½-5 chambers (Plate 66: Figures 1, 2, Plate 67: Figures 13, 14) in each whorl (= Globigerina sabina Luterbacher and Premoli Silva, 1964; Globorotalia (Turborotalia) longiapertura paratypes of Blow, 1979, Plate 63: Figures 1-3; Parvularugoglobigerina morphotype 3 of D'Hondt and Keller, 1991; Parvularugoglobigerina cf. eugubina of Liu and Olsson, 1992) and a relatively low-spired form characterized by 5-8 chambers per whorl (Plate 66: Figures 7, 8, 10-12, Plate 67: Figures 1,3, 10, 12) that has an apertural extension from the umbilicus to a near peripheral location and slightly more embracing chambers with less deeply incised sutures (the longiapertura morphotype of Blow, 1979). [Olsson et al. 1999]

Globigerina minutula Luterbacher and Premoli Silva, 1964, was described along with Globigerina eugubina from the Gubbio section. The holotype drawing of G. minutula illustrates a very low trochospiral, 3-chambered form, which closely resembles Plate 65: Figure 13 that was selected from the type level. The specimen is completely recrystallized so that it is uncertain whether it is a microperforate or normal perforate taxon. Consequently, given its generalized morphology, we cannot accurately identify this taxon.[Olsson et al. 1999]

Although badly preserved, the type specimen of Postrugoglobigerina hariana Salaj, 1986, is indistinguishable from Parvularugoglobigerina eugubina. The holotype of P. hariana is a low trochospiral form with a pore-mound surface texture, five globular chambers in each of two whorls, a low rate of chamber expansion, and a "narrow slot-like interiomarginal umbilical aperture at the base of the last chamber" (Salaj, 1986:53). Consequently, Postrugoglobigerina hariana Salaj, 1986, is regarded as a junior synonym of Parvularugoglobigerina eugubina (Luterbacher and Premoli Silva, 1964). In addition, we include in P. eugubina a number of forms identified by Blow (1979) and Keller (1988) to various species of cancellate Danian species (see synonomy). The illustrations of Blow and Keller clearly show a microperforate wall structure; therefore, these identifications are incorrect. The general morphology of their illustrated forms falls within the broadened concept of P. eugubina. [Olsson et al. 1999]

Catalog entries: Globigerina eugubina, Globigerina anconitana, Globigerina sabina, Globigerina umbrica, Globorotalia (Turborotalia) longiapertura, Postrugoglobigerina hariana, Globigerina minutula

Type images:

Distinguishing features: Morphology extremely variable; test small, trochospiral with 2½ whorls, each with 4½ to 8 inflated subglobular chambers, increasing slowly in size. The first and last whorls generally contain the same number of chambers. Spire height  low to moderate; aperture elongate with a thickened rim, umbilical to nearly peripheral, may show more than one dorsal aperture.

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


Diagnostic characters: Parvularugoglobigerina eugubina exhibits extremely variable morphology. The test is a small trochospire with 2½ whorls, each composed of 4½ to 8 inflated subglobular chambers, increasing slowly in size. The first and last whorls generally contain the same number of chambers. Spire height is low to moderate. The test wall is microperforate and well-preserved specimens sometimes exhibit surficial pore-mounds. The aperture is elongate and marked by a thickened rim. The apertural position ranges from umbilical to nearly peripheral. Individual specimens sometimes exhibit a dorsal aperture or both dorsal and umbilical apertures on the final chamber. Some may show more than one dorsal aperture. [Olsson et al. 1999]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Inflatedcoiling axis:Low-moderateperiphery:N/Aaperture border:Thin lip
umb chbr shape:Inflatedumbilicus:Wideperiph margin shape:Moderately roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Moderately muricateshell porosity:Microperforate: <1µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.5-6.5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Biogeographic data indicate that P. eugubina was a low to middle latitude taxon with an open-ocean affinity ( Premoli Silva and Bolli, 1973; Premoli Silva and Boersma, 1989; D'Hondt, 1991; D'Hondt and Keller,
1991; Liu and Olsson, 1992) (Figure 33). [Olsson et al. 1999]

Isotope paleobiology: Oxygen isotopic data suggest that P. eugubina occupied a slightly deeper or cooler-season planktic niche than co-occurring G. cretacea and Woodringina spp. (Boersma et al., 1979; Boersma, 1984a; D'Hondt and Zachos, 1993). [Olsson et al. 1999]

Phylogenetic relations: This species evolved from Guembelitria cretacea via Parvularugoglobigerina extensa at the base of Zone Pa. [Olsson et al. 1999]

Most likely ancestor: Parvularugoglobigerina extensa - at confidence level 3 (out of 5). Data source: Olsson et al. 1999 fig6, Koutsoukos 2014, fig16.

Biostratigraphic distribution

Geological Range:
Notes: The LAD of Parvularugoglobigerina eugubina marks the base of zone P1a / top of Pa (Wade et al. 2011)
The FAD of Parvularugoglobigerina eugubina marks the base of zone Pa / top of P0 (Wade et al. 2011)
Last occurrence (top): at top of Pa zone (100% up, 65.7Ma, in Danian stage). Data source: zonal marker (Wade et al. 2011)
First occurrence (base): at base of Pa zone (0% up, 66Ma, in Danian stage). Data source: zonal marker (Wade et al. 2011)

Plot of occurrence data:

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 83

References:

Blow, W. H. (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea). E. J. Brill, Leiden. 2: 1-1413. gs

D'Hondt, S. & Keller, G. (1991). Some patterns of planktic foraminiferal assemblage turnover at the Cretaceous-Tertiary boundary. Marine Micropaleontology. 17: 77-118. gs

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

Liu, C. & Olsson, R. K. (1992). Evolutionary radiation of microperforate planktonic foraminifera following the K/T mass extinction event. Journal of Foraminiferal Research. 22: 328-346. gs

Luterbacher, H. P. & Premoli Silva, I. (1964). Biostratigrafia del limite Cretaceo-Terziaroio nell'Appennino centrale. RIvista Italiana di Paleontologia e Stratigrafia. 70: 67-128. 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

Premoli Silva, I. & Bolli, H. M. (1973). Late Cretaceous to Eocene planktonic foraminifera & stratigraphy of Leg 15 Sites in the Caribbean Sea. Initial Reports of the Deep Sea Drilling Project. 15: 449-547. gs

Salaj, J. (1986). The new Postrugoglobigerina praedaubjergensis Zone at the base of the stratotype of the marine Paleocene (El Kef, Tunisia). Geologický zborník : geologica Carpathica. 37: 35-58. gs

Wade, B. S., Pearson, P. N., Berggren, W. A. & Pälike, H. (2011). Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale. Earth-Science Reviews. 104: 111-142. gs


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Parvularugoglobigerina eugubina compiled by the pforams@mikrotax project team viewed: 9-4-2020

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