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Scientific article
English

New lineage of Triassic aragonitic Foraminifera and reassessment of the class Nodosariata

Contributors

Rigaud, Sylvain; Vachard, Daniel; Schlagintweit, Felix; Martini, Rossana

Published in

Journal of systematic palaeontology, vol. 14, no. 11, p. 919-938

Publication date

2016

Abstract

The new, atypical aragonitic foraminifer Tubulastella comans gen. et sp. nov. is described from the Late Triassic of Panthalassa (Wallowa terrane, north-east Oregon, USA). This rectilinear, undivided tubular form is closely related to ‘Coptocampylodon? rhaeticus', a Rhaetian incertae sedis commonly found in the western Tethys. Morphologically and structurally distinct from other aragonitic foraminifers, Tubulastella comans gen. et sp. nov. and T. rhaetica gen. et comb. nov. are part of an independent aragonitic lineage, here embodied by the family Tubulastellidae fam. nov. To understand the origination and taxonomic affinity of this unique taxon, a comparative study between Tubulastella and the calcitic syzraniid foraminifer Rectostipulina is carried out. Although these forms differ in wall composition, they present identical constructional patterns, providing evidence of their close phylogenetic relationship. The existence of an aragonitic branch in Nodosariata evolution deeply challenges current foraminiferal classifications and evolutionary hypotheses. We here propose to limit the class Nodosariata to a monophyletic group of bi- to plurilocular foraminifers originating from a Silurian earlandiid ancestor, and the order Nodosariida to a monophyletic lineage of primarily single-layered built foraminifers, which takes root in the Middle Pennsylvanian. This new classification reflects an evolutionary transition from calcitic to aragonitic walls, as documented in other shelled organisms, and definitively excludes calcitic unilocular foraminifers (i.e. Ellipsolagenidae and Lagenidae) from the class Nodosariata.

Keywords

  • Aragonitic foraminifers
  • Higher classification
  • Nodosariida
  • Lagenida
  • Upper Triassic
  • Wallowa terrane

UNIGE affiliation entities

UNIGE research groups

Citation (ISO format)

RIGAUD, Sylvain et al. New lineage of Triassic aragonitic Foraminifera and reassessment of the class Nodosariata. In: Journal of systematic palaeontology, 2016, vol. 14, n° 11, p. 919–938. doi: 10.1080/14772019.2015.1112846

Main files (1)

Article (Accepted version)

Identifiers

Journal ISSN

1477-2019
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Technical informations

Creation

07/06/2016 21:43:00

First validation

07/06/2016 21:43:00

Update

13/10/2025 20:54:21

Status update

15/03/2023 00:26:11

Last indexation

29/10/2025 13:58:00
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