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Middle Furongian (late Cambrian) shumardiids from the Sesong Formation, Taebaek Group, Korea

Published online by Cambridge University Press:  20 May 2016

Tae-Yoon Park  and
Duck K. Choi
Tae-Yoon Park
Affiliation:
School of Earth and Environmental Sciences, Seoul National University, Seoul 151-747, Korea,
Duck K. Choi
Affiliation:
School of Earth and Environmental Sciences, Seoul National University, Seoul 151-747, Korea,
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Abstract

The trilobite family Shumardiidae is characterized by small size, lack of eyes, yoked librigenae, and a small number of thoracic segments. Here we report the successive occurrence of three middle Furongian shumardiid species from the Sesong Formation of Korea: Elaphraella? taebaeksanensis n. sp., Elaphraella microforma, and Elaphraella nodus. They appear to represent the oldest shumardiid morphology known so far. This genus lacks the anterolateral swellings on the glabella and has a conical glabella. Its yoked librigenae also encompass a comparatively wide genal field. Elaphraella? taebaeksanensis has a highly inflexed facial suture which may reflect the presence of small palpebral lobes. Taken together, the plesiomorphic morphology of the Shumardiidae can be summarized as having a conical glabella, small palpebral lobes, highly arched anterior cephalic margin, a wide librigenal field, and no anterolateral swellings on the glabella.

Type
Research Article
Information
Journal of Paleontology , Volume 86 , Issue 1 , January 2012 , pp. 51 - 59
Copyright
Copyright © The Paleontological Society 

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