The role of taphonomy in cladistic analysis: A case study in Permian bivalves.

Autores/as

  • Marcello Guimarães Simões lnstituto de Biociencias-UNESP
  • Antonio Carlos Marques FFCLRP-USP
  • Luiz Henrique Cruz de Mello Inst. Geociencias-USP
  • Renato Pirani Ghilardi Inst. Geociencias-USP

DOI:

https://doi.org/10.7203/sjp.15.2.22140

Palabras clave:

Phylogeny, Cladistics, Paleontology, Taphonomy, Stratigraphy, Paleoecology, Bivalvia, Megadesmidae.

Resumen

The Megadesmidae (Bivalvia, Anomalodesmata) fossil record was examined in order to assess the role of taphonomy in cladistic analysis. Megadesmids are thick-shelled, infaunal, suspension-feeding bivalves. Our data indicate that their fossil record seems biased in favor of thick-shelled, shallow-burrowing genera and/or deep­burrowing forms. Consequently, there is a relation between the mode of life (shallow versus deep) and the resolution and quality of the fossil record. Deep-burrowers (Vacunella) are often preserved in life position offering a more accurate (temporal and spatial) fossil record, adequate for paleoecological inferences, while shallow-burrower shells (Plesiocyprinella), that are more prone to post-mortem transport and temporal mixing, offer a record with poor spatial and temporal resolution. The identification of homoplasy among infauna! bivalves constitutes a major challenge for their cladistic analysis. Within Megadesmidae intrinsic (bauplan limitations) and extrinsic (better preservational potential) factors favor the occurrence and preservation of homoplasy among the deep-burrowers. The implications are: a) clustering of deep-burrowing bivalves (Vacunella, Roxoa) due to parallel homoplasies, forming "adaptive", not necessarily "evolutive" taxa, and b) lower consistency indices in their cladistic analysis. 

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Publicado

2021-12-19

Cómo citar

Guimarães Simões, M., Marques, A. C., Cruz de Mello, L. H., & Pirani Ghilardi, R. (2021). The role of taphonomy in cladistic analysis: A case study in Permian bivalves. Spanish Journal of Palaeontology, 15(2), 153–164. https://doi.org/10.7203/sjp.15.2.22140
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