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| Format: | Artículo científico |
| Language: | en |
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Sociedad Geológica Mexicana, A.C.
2018
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| Online Access: | https://www.redalyc.org/articulo.oa?id=94362562007 https://www.redalyc.org/journal/943/94362562007/ https://www.redalyc.org/journal/943/94362562007/html/ https://www.redalyc.org/journal/943/94362562007/94362562007.epub https://www.redalyc.org/journal/943/94362562007/movil |
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Table of Contents:
- How much variation is in the shape of fossil pupation chambers? An exploratory geometric morphometric analysis of Fictovichnus gobiensis from the Late Eocene of Oaxaca, southern Mexico Rosalía Guerrero-Arenas Tania Zúñiga-Marroquin Eduardo Jiménez-Hidalgo Ciencias de la Tierra shape Oaxaca Coleoptera Pupation chambers Fictovichnus gobiensis Shape is one of the characteristics most often used for the identification of ichnotaxa. Several studies have demonstrated the potential of geometric morphometrics in ichnology, in order to distinguish the nature of the tracers’ producers. In this study, we used geometric morphometrics to analyze variation of shape in Fictovichnus gobiensis, a fossil pupation chamber produced by Coleoptera. The objective of this study was to analyze diverse clusters of similarly shaped pupal chambers, indicative of several coleopteran producers. The 42 analyzed specimens were collected from late Eocene-aged outcrops in the surrounding areas of Santiago Yolomécatl, northwestern Oaxaca, where these fossil traces are relatively abundant. On the specimens, 2 landmarks and 34 semilandmarks were placed for 2-dimensional Cartesian coordinates. Shape variation was analyzed with Procrustes distances as a measure of similarity. Unweighted Pair Group Method with Arithmetic Mean method was used for cluster analyses, and Principal Component Analysis and Canonical Variates Analysis were used to explore shape variety and differences between the clusters. The elliptical shape of the chambers is variable, but it was possible to group and distinguish 4 main morphs, suggesting 4 potential producers. Morphs recognized in this study represent indirect evidence of beetle diversity that were not directly preserved in the fossil record. Future analyses in pupal chambers of recent Coleoptera could clarify the nature of the producers. Additional research could establish if more morphs exist in larger samples from Yolomécatl localities. 2018 artículo científico 1405-3322 https://www.redalyc.org/articulo.oa?id=94362562007 https://www.redalyc.org/journal/943/94362562007/ https://www.redalyc.org/journal/943/94362562007/html/ https://www.redalyc.org/journal/943/94362562007/94362562007.epub https://www.redalyc.org/journal/943/94362562007/movil 10.18268/BSGM2018v70n2a6 en http://www.redalyc.org/revista.oa?id=943 Boletín de la Sociedad Geológica Mexicana application/pdf Sociedad Geológica Mexicana, A.C. Boletín de la Sociedad Geológica Mexicana (México) Num.2 Vol.70