FIRST FOSSIL OCCURRENCE OF THE GENUS PLATYCHELYNA HAYWARD AND THORPE, 1990 (BRYOZOA: CHEILOSTOMATA)

Authors

  • Juan López-Gappa Museo Argentino de Ciencias Naturales
  • Leandro Martín Pérez División Paleozoología Invertebrados
  • Miguel Griffin División Paleozoología Invertebrados

Keywords:

New species. Bryozoa. Smittinidae. Monte León Formation. Early Miocene. Argentina.

Abstract

Platychelyna secunda sp. nov. is described based on material collected in the Monte León Formation, Patagonia, Argentina (early Miocene). This is the second species of Platychelyna Hayward and Thorpe to be described and the first fossil representative, expanding the stratigraphic range of the genus by ~20 Ma. P. secunda and P. planulata Hayward show similar geographic distributions in the southern tip of South America. Zooid size is ~50% larger in the recent species compared to the fossil one, which could be related to the cooling of the water masses in the Southwest Atlantic since the opening of the Drake Passage towards the end of the Oligocene.

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Published

2018-11-20

Issue

Vol. 55 No. 5 (2018)

Section

Paleontological Notes

License

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How to Cite

FIRST FOSSIL OCCURRENCE OF THE GENUS PLATYCHELYNA HAYWARD AND THORPE, 1990 (BRYOZOA: CHEILOSTOMATA). (2018). Ameghiniana, 55(5), 607-612. https://ameghiniana.org.ar/index.php/ameghiniana/article/view/3188