pforams@mikrotax - Tenuitella angustiumbilicata pforams@mikrotax - Tenuitella angustiumbilicata

Tenuitella angustiumbilicata

Classification: pf_cenozoic -> Globigerinitidae -> Tenuitella -> Tenuitella angustiumbilicata
Sister taxa: T. clemenciae ⟩⟨ T. angustiumbilicata, T. munda, T. gemma, T. praegemma, T. patefacta, T. insolita, T. sp.


Citation: Tenuitella angustiumbilicata (Bolli, 1957)
taxonomic rank: species
Basionym: Globigerina ciperoensis angustiumbilicata Bolli, 1957
Taxonomic discussion:

Bolli (1957) described this form as a subspecies of Globigerina ciperoensis (=Ciperoella ciperoensis in this work) and always maintained the close affinity of the two forms (up to and including Bolli and Saunders, 1985). For Bolli, its distinguishing feature was the narrow umbilicus (angustus, L. = narrow). Fleisher (1974:1018) included angustiumbilicata in the macroperforate spinose genus Globigerina but regarded its wall texture as a “possible exception” from being spinose. Jenkins and Orr (1972), Quilty (1976), and Kennett and Srinivasan (1983) all illustrated what are clearly microperforate specimens under the name angustiumbilicata while other authors (e.g., Poore and Brabb, 1977) illustrated macroperforate forms which we would now assign to the Ciperoella group. Li (1987) reported that R. Fleisher had re-examined the holotype at the U.S. National Museum in December, 1986, and informed him that the test has a “microperforate wall texture rather than a spinose one” (quoted in Li, 1987:311). We confirm this observation with new SEMs of the holotype which is clearly microperforate and pustulose as opposed to macroperforate and pitted (see Plate 16.4, Figs. 1-3). Bolli’s figured paratype is, by contrast, macroperforate and of uncertain affinity. [Pearson et al. 2018]

As discussed above, Bolli (1957:109) distinguished his subspecies from ciperoensis by the small umbilicus. He also noted that “the aperture, which is umbilical in position, may in some specimens show a tendency towards an umbilical-extraumbilical position”. Li (1987), following long tradition in foraminiferal taxonomic practice, regarded the supposedly intraumbilical position of the aperture as a genus level character and named the genus Teneuitellinata for Tenuitella-like forms with an intraumbilical aperture. The genus was, for Li, a form-genus, because the intraumbilical position evolved more than once (in angustiumbilicata and a form he called ‘Tenuitellinata cf. pseudoedita’). Pearson and Wade (2009:213) noted that the apertural position in populations of angustiumbilicata is variable and that the holotype itself, which is a specimen with a very narrow umbilicus, has an intra-extraumbilical aperture (see Plate 16.4, Fig. 1). For these reasons we follow Pearson and Wade (2009) in regarding Tenuitellinata as synonymous with Tenuitella. [Pearson et al. 2018]

Blow (1969) described Globigerina stainforthi praestainforthi from the Mosquito Creek outcrop locality in the Cipero Fm., Trinidad. Given our modern understanding of wall textures, it is quite clear from Blow’s own images of stainforthi and praestainforthi that the two are unrelated, notwithstanding their similarity in gross morphology: stainforthi is a cancellate macroperforate form whereas praestainforthi is clearly microperforate and pustulose. Li (1987) pointed out the close similarity between praestainforthi and angustiumbilicata. Pearson and Wade (2009) re-collected from the type locality and illustrated a specimen similar to the holotype (Pearson and Wade, 2009, pl. 8, figs. 5a-e) and also showed the wall in cross-section, demonstrating a radial crystalline structure typical of the glutinata-type wall (Chapter 15, this volume). Following Li, they emphasized the strong similarity to Tenuitella angustiumbilicata, which is very common in the Cipero Fm., except for the large umbilical bulla and strongly pustulose surface texture. They suggested that angustiumbilicata and praestainforthi “may be morphs of the same biospecies”, the latter being a late ontogenetic stage (i.e., with gametogenic features). The two forms have virtually identical stratigraphic ranges, both becoming extinct at the same level in the early Miocene (Li and others, 1992:581). Here we place them formally in synonymy, consistent with our view that the presence or absence of an umbilical bulla is not a species-defining characteristic. [Pearson et al. 2018]

Li (1987:312) distinguished a form as Tenuitellinata cf. T. pseudoedita (Subbotina) based on the “slightly convex spiral side and low arched (often variable) aperture, which is strongly anterioumbilical”. We have been unable to confirm a clear distinction between these morphs and so regard them as within the variability of populations of T. angustiumbilicata. [Pearson et al. 2018]

BouDagher-Fadel (2012a, pl. 5.3, figs. 3, 4) attempted to establish a new species Tenuitellinata praepseudoedita. The two published images (one an umbilical view, the other a side view) are both reproduced from Li (1987) without acknowledgment or attribution. In the caption to the plate, both images are indicated as the holotype, but actually they are two different specimens (No. P52020 and P52022 as documented by Li, 1987:301). There is no formal description, diagnosis or notice of repository. We regard the taxon as invalid because of 1) inadequate identification of the true nature of the type material, and 2) ambiguity as to which of the figured specimens is the holotype. When these facts were brought to her attention, BouDagher-Fadel (2012b) attempted to amend and validate praepseudoedita in a taxonomic note by citing Li (1987) and providing a short diagnosis. However the ambiguity over the type specimen was not resolved and hence the taxon remains invalid. We should also bear in mind Recommendation 73B of the code: “An author should designate as a holotype a specimen actually studied by him or her, not a specimen known to the author only from descriptions or illustrations in the literature” (International Code of Zoological Nomeclature, 1999). [Pearson et al. 2018] 

Catalog entries: Globigerina ciperoensis angustiumbilicata

Type images:

Distinguishing features:
Parent taxon (Tenuitella): Minute to small, low trochospiral test, with globular chambers. Monolamellar, microperforate wall with a smooth or finely pustulate surface.
This taxon: Like Tenuitella gemma but chambers more inflated, especially in edge and umbilical view, and slightly higher trochospiral, and also by typically has 4½ (vs. 5-6) chambers in final whorl. Wall texture is distinctly more pustulose.

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.


Test small, very low trochospiral, equatorial periphery lobate, circular in outline, axial periphery rounded; chambers globular to slightly subquadrate, slightly compressed and inflated on the umbilical side, 4-5 in the final whorl, 10-12 comprising adult tests, increasing slowly in size; sutures straight, radial, depressed on spiral and umbilical sides; umbilicus narrow, deep, sometimes closed; aperture arched, bordered by a narrow lip, variable in position, either intraumbilical or intra-extraumbilical in position. Specimens may exhibit a single, encroaching umbilical bulla with 3-5 small, arched, infralaminal apertures (‘praestainforth’ morphotype). [Pearson et al. 2018]

Wall type:
Microperforate glutinata-type wall, surface smooth to finely pustulose, pustules irregularly scattered on both sides of test. May become densely pustulose, especially in bullate individuals.

Holotype 0.16 mm diameter; hypotypes 0.13-0.17 mm diameter, 0.70-0.80 mm breadth. [Pearson et al. 2018]

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Extraumbilical-peripheral
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:Microperforate: <1µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:4-5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution

Global, from the tropics to high latitudes. [Pearson et al. 2018

Isotope paleobiology
Inhabited the warm surface mixed-layer (Poore and Matthews, 1984; van Eijden and Ganssen, 1995; Pearson and others, 1997; Pearson and Wade, 2009). [Pearson et al. 2018]

Phylogenetic relations
This species is very rare in the lower Oligocene but becomes more abundant at higher levels. Presumably it evolved from Tenuitella munda which has a similar wall texture and morphology, although transitional forms have yet to be identified. [Pearson et al. 2018]

Most likely ancestor: Tenuitella munda - at confidence level 3 (out of 5). Data source: Pearson et al. 2018.

Biostratigraphic distribution

Geological Range:
Notes: The earliest confirmed occurrences are in the lower Oligocene. Premoli Silva and Spezzaferri (1990) record a clear lowest occurrence along with Cassigerinella chipolensis in the lower part of Zone P18 (= Zone O1) in ODP Site 709. According to van Eijden and Smit (1991) and Li and others (1992) it is very rare in the lower Oligocene, becoming abundant only in the upper Oligocene: this pattern seems to be true globally. The highest reliable occurrences are in the lower Miocene (Tenuitella minutissima Zone of ODP Hole 747A, Kerguelen Plateau; Li and others, 1992:585: probably equivalent to (sub)tropical Zone M2). Reported occurrences throughout the Neogene by various authors are considered doubtful in view of the homeomorphy within this group but this question is reserved for future study. [Pearson et al. 2018]
Last occurrence (top): within M2 zone (19.30-21.12Ma, top in Burdigalian stage). Data source: Pearson et al. 2018 f16.1
First occurrence (base): within O1 zone (32.10-33.90Ma, base in Priabonian stage). Data source: Pearson et al. 2018 f16.1

Plot of occurrence data:

Primary source for this page: Pearson et al. 2018 - Olig Atlas chap.16 p.443


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Tenuitella angustiumbilicata compiled by the pforams@mikrotax project team viewed: 17-7-2024

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