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The Association of Korean Geoscience Societies (한국지질과학협의회)
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Phylogenetic relationships among Adelograptus, Ancoragraptus and Psigraptus

Cho, Hyun-Su;Kim, Jeong-Yul;Jin, Yeong-Pil

  • Published : 20090600
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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.

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References

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