CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana neotricarinata Petrizzo Falzoni & Premoli Silva 2011
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Citation: Globotruncana neotricarinata Petrizzo Falzoni & Premoli Silva 2011Taxonomic rank: speciesType specimens: Micro-Unimi 1983Type sample (& lithostrat): holotype from sample 198-1210B-38H-6, 28-30 cm, paratype from sample 198-1210B-39H-CC.Type locality: Shatsky Rise, northwestern Pacific Ocean.Type repository: Milan, Italy; Collection of the Laboratory of Micropaleontology, University of Milan
Original Description Wall macroperforate. Test low trochospiral, equatorial periphery lobate, lateral profile asymmetrical, spiral side from flat to weakly convex, umbilical side more convex, peripheral margin with two equidistant keels parallel to the coiling axis or weakly tilted towards the umbilical side and separated by a narrow and imperforate band. An apparent third keel is present due to the increase of the last chambers height on the umbilical side that results in an umbilical shoulder. Five to eight chambers in final whorl slowly increasing in size, trapezoidal, from flat to slightly inflated on the umbilical side, petaloid to slightly crescent-shaped chambers, smooth and flat on the spiral side; sutures raised from sigmoidal to curved on the umbilical side, curved and raised on the spiral side; primary aperture umbilical and covered by tegilla. Distinguished from G. linneiana ( = G. tricarinata) by having a trapezoidal instead of a rectangular peripheral margin, a narrower peripheral band and an apparent third keel that results in a weakly developed umbilical shoulder. Differs from G. ventricosa in having a more compressed peripheral outline and by possessing a less raised umbilical shoulder that develops only on the last chambers of the last whorl. Phylogenetic relationships. This form evolved from G. linneiana by increasing the height of the chambers on the umbilical side and by acquiring an apparent third keel on the peripheral view. It gave rise to G. ventricosa through the developing of the convexity of the umbilical side. Etymology: Named for its resemblance to specimens erroneously assigned to Globotruncana tricarinata (junior synonym of G. linneiana).
Extra details from original publication Distinguishing features. - Distinguished from G. linneiana (=G. tricarinata) by having a trapezoidal instead of a rectangular peripheral margin, a narrower peripheral band and an apparent third keel that results in a weakly developed umbilical shoulder. Differs from G. ventricosa in having a more compressed peripheral outline and by possessing a less raised umbilical shoulder that develops only on the last chambers of the last whorl.
Phylogenetic relationships. - This form evolved from G. linneiana by increasing the height of the chambers on the umbilical side and by acquiring an apparent third keel on the peripheral view. It gave rise to G. ventricosa through the developing of the convexity of the umbilical side.
Stratigraphic range. - Globotruncana neotricarinata shows a diachronous stratigraphic distribution. In the Bottaccione section it first appears close to the disappearance level of Dicarinella asymetrica (at 222 m) and likely disappears within the Gansserina gansseri Zone. In the Exmouth Plateau it is documented to first occur close to the appearance of D. asymetrica and is consistently present till the occurrence of G. rajagopalani. Determination of its precise extinction level in the Southern Ocean record will require further study.
Remarks. Globotruncana neotricarinata resembles the neotype erected by Brönnimann and Brown (1956) for G. linneiana (Fig. 3(3a-c)) that was described from Recent sand beach containing resedimented Cretaceous material. In our opinion, the neotype does not strictly follow d’Orbigny’s original description and illustration.
References:
Petrizzo, M. R., Falzoni, F. & Premoli Silva, I. (2011). Petrizzo, M. R., Falzoni, F. & Premoli Silva, I. (2011). Identification of the base of the lower-to-middle Campanian Globotruncana ventricosa Zone: Comments on reliability and global correlations. Cretaceous Research. 32: 387-405. Cretaceous Research. 32: 387-405. gs
Globotruncana neotricarinata compiled by the pforams@mikrotax project teamviewed: 18-6-2025
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ODP Leg 198 Shatsky Rise-807.jpg
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ODP Leg 198 Shatsky Rise-807.jpg
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