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Geosciences Journal

, Volume 13, Issue 2, pp 133–139 | Cite as

Phylogenetic relationships among Adelograptus, Ancoragraptus and Psigraptus

  • Hyun Su Cho
  • Jeong Yul Kim
  • Yeong Pil Jin
Article

Abstract

New graptolite material from the Mungok Formation, Yeongwol, Korea, suggests that psigraptids evolved from a species of Ancoragraptus. The main trait of the proposed lineage is a reclined rhabdosome, stipe reduction, and metathecal separation. Ancoragraptus psigraptoides new species, which is the intermediary between Adelograptus sp. 1 and Psigraptus jacksoni, is described. The free metasicula and slightly reclined stipes appear first in Ancoragraptus psigraptoides. A possible route for the lineage is discussed: Adelograptus sp. 1-Ancoragraptus psigraptoides-Psigraptus jacksoni.

Key words

graptolite phylogeny Ordovician Mungok Yeongwol 

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Copyright information

© The Association of Korean Geoscience Societies 2009

Authors and Affiliations

  1. 1.Department of GeologyState University of New York at BuffaloNew YorkUSA
  2. 2.Department of Earth Sciences EducationKorea National University of EducationChungbukKorea

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