Catapsydrax dissimilis


Classification: pf_cenozoic -> Globigerinidae -> Catapsydrax -> Catapsydrax dissimilis
Sister taxa: C. indianus, C. dissimilis, C. globiformis, C. africanus, C. howei, C. unicavus, C. sp.,

Taxonomy

Citation: Catapsydrax dissimilis Cushman & Bermudez 1937
Rank: Species
Basionym: Globigerina dissimilis
Synonyms:
Taxonomic discussion:

Whether Cushman and Bermúdez’s (1937) holotype of dissimilis, which is described as from the “Eocene of Cuba”, does in fact have two infralaminal apertures is debatable, even after additional SEM imaging, because adhering material clogs the umbilical region (Pl. 4.1, Figs. 1-3). Our new SEM images of the paratype of dissimilis, from the same locality as the holotype, however, clearly show two infralaminal apertures (Pl. 4.1, Figs. 4-5), thus we can give the holotype the benefit of the doubt and consider the second opening to be concealed, as is consistent with the traditional understanding of this species.

As described by Blow (1979), many authors’ concept of dissimilis is based on Oligocene specimens that are closer to Blow and Banner’s (1962) subspecies Globigerinita dissimilis ciperoensis (Pl. 4.1, Figs. 6-8) (compact, flattened bulla) from the lower Oligocene of Trinidad, than to the Eocene holotype of C. dissimilis (Pl. 4.1, Figs. 1-3). Both holotypes exhibit a bulla and two infralaminal apertures but the bulla and test are generally more inflated in C. dissimilis sensu stricto. Because the concept of C. dissimilis is well entrenched we take a conservative approach and regard dissimilis ciperoensis as a junior synonym of the former (see also discussion in Pearson and Wade, 2009). Morphological evolution of Catapsydrax through the late Oligocene involved expansion of the bulla across the ventral surface and an increase in the number of infralaminal openings (up to 4) on a simple (non-lobed) bulla. Under our taxonomy Catapsydrax dissimilis is expanded to include these morphologies (Plate 4.1, Fig. 11).

Globigerinita riveroae Bermúdez (1961) is tentatively placed as a junior synonym of C. dissimilis (Plate. 4.1, Fig. 14), although it is possible that this species is closer to Subbotina corpulenta, owing to the large size and globular form.[Coxall & Spezzaferri 2018]

Catalog entries: Globigerina dissimilis, Globigerina simulans

Type images:

Distinguishing features: Like C. unicavus but with 2-4 infralaminal openings around the bulla (vs. 1 in C. unicavus)

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:

Catapsydrax dissimilis is distinguished from C. unicavus by having 2-4 infralaminal openings around the bulla compared to 1 in C. unicavus. The chambers of the final whorl are also usually of more similar size in C. dissimilis compared to C. unicavus, giving C. dissimilis a more lobed peripheral outline. It is distinguished from Globorotaloides suteri by the higher trochospire, the umbilically centered primary aperture (although concealed) and bulla with multiple infralaminal apertures. It further differs from Globorotaloides stainforthi by having one fewer chamber in the final whorl and from Catapsydrax indianus by the less globular form and simple non-lobed bulla. [Coxall & Spezzaferri 2018]


Wall type: Coarsely cancellate, sacculifer-type, probably spinose; in adult stage wall becomes thickened. [Coxall & Spezzaferri 2018]

Test morphology: Test moderately large, compact, low-moderate trochospiral of 2½-3 whorls, involute, lobate with 4 chambers in the final whorl, enlarging slowly. Later chambers are inflated, subglobular but slightly appressed and embracing. The early ontogenetic whorl, comprising 4½-5 chambers, is flattened or raised slightly above the adult whorl as seen in spiral view. Sutures are straight and depressed on the umbilical side and moderately depressed and slightly curved on spiral side. The primary aperture is a low umbilical arch covered by a single slightly inflated or flattened bulla less coarsely cancellate than the rest of test, with 2 or more (up to 4) rimmed infralaminal openings. [Coxall & Spezzaferri 2018]

Size: Maximum diameter of holotype ~0.5 mm, thickness ~0.3 mm. [Coxall & Spezzaferri 2018]

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:Inequally biconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Lowperiphery:N/Aaperture border:Bulla
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Moderately roundedaccessory apertures:Infralaminal
spiral sutures:Moderately depressedumb depth:Deepwall texture:Cancellateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.0-4.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Global, low to high latitudes, including New Zealand, the subantarctic and high North Atlantic Ocean (Berggren, 1972; Huber, 1991; Galeotti and others, 2002). It is more common in upwelling regions (Spezzaferri, 1995). [Coxall & Spezzaferri 2018]

Isotope paleobiology: Catapsydrax dissimilis, like other species of Catapsydrax, registers among the most positive δ18O values within an assemblage, and lowest δ13C indicating it was a sub-thermocline calcifier and among the deepest dwelling of the Oligocene planktonic foraminifera (Poore and Matthews, 1984; van Eijden and Ganssen, 1995; Wade and others, 2007; Pearson and Wade, 2009; Spezzaferri and Pearson, 2009; Moore and others, 2014). [Coxall & Spezzaferri 2018]

Phylogenetic relations: Catapsydrax dissimilis evolved from C. unicavus in the upper middle Eocene Zone E13 (Blow and Banner, 1962). Blow (1979) suggested that the ancestor was Globigerinita simulans (Bermúdez) but the specimens he ascribed to that species are here included in the synonymy of unicavus (see below). [Coxall & Spezzaferri 2018]

Most likely ancestor: Catapsydrax unicavus - at confidence level 4 (out of 5). Data source: Olsson et al. 2006 f5.1.
Likely descendants: Catapsydrax indianus;

Biostratigraphic distribution

Geological Range:
Notes: According to Blow and Banner (1962:106-107) “Globigerinita dissimilis dissimilis ranges from at least the upper part of the Truncorotaloides rohri Zone, Navet Formation, middle Eocene, to the top of the Globigerinita stainforthi Zone (Aquitanian) in southern Trinidad. In Tanganyika [=Tanzania] it is known to occur also from the upper part of the Truncorotaloides rohri Zone, ranging up into the Aquitanian”. The oldest specimen figured by Blow and Banner (1962) is from the “Globigerapsis semi-involuta Zone” (=E14/E15 of Wade and others, 2011). In summary, C. dissimilis extends from the upper middle Eocene (Zone E13) (Blow and Banner, 1962) to the lower Miocene Zone bearing the taxon’s name, i.e. Zone M3, the Globigerinatella sp./Catapsydrax dissimilis Concurrent range Zone (Bolli, 1957; Spezzaferri, 1994; Wade and others, 2011), where it has been found to occur commonly (Bolli, 1957; Berggren and others, 1995). The highest occurrence of Catapsydrax dissimilis remains a marker in standard biostratigraphic zonal schemes (Bolli, 1957; Kennett and Srinivasan, 1983; Bolli and Saunders, 1985; Berggren and others, 1995; Wade and others, 2011) and is calibrated to 17.62 Ma on the time scale of Cande and Kent (1995) (Wade and others, 2011). [Coxall & Spezzaferri 2018]
Last occurrence (top): at top of M3 zone (100% up, 17.5Ma, in Burdigalian stage). Data source: Wade et al. 2011; Coxall & Spezzaferri 2018
First occurrence (base): within E13 zone (37.99-39.97Ma, base in Bartonian stage). Data source: Coxall & Spezzaferri 2018

Plot of occurrence data:

Primary source for this page: Coxall & Spezzaferri 2018 - Olig Atlas chap.4 p.83; Olsson et al. 2006 - Eocene Atlas, chap. 5, p. 71

References:

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Catapsydrax dissimilis compiled by the pforams@mikrotax project team viewed: 16-9-2019

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