A TERATOLOGICAL PYGIDIUM OF THE UPPER CAMBRIAN TRILOBITE EUGONOCARE (PSEUDEUGONOCARE) BISPINATUM FROM THE MACHARI FORMATION, KOREA

JEONG GU LEE; DUCK K. CHOI; BRIAN R. PRATT

doi:10.1666/0022-3360(2001)075<0216:ATPOTU>2.0.CO;2

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JEONG GU LEE,¹ DUCK K. CHOI,¹ BRIAN R. PRATT²

¹Department of Geological Sciences, Seoul National University, Seoul 151-742, Korea, < >, < >, and leejg1@hotmail.com dkchoi@snu.ac.kr
²Department of Geological Sciences, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada, < > brian.pratt@usask.ca

Abstract

A teratological holaspid pygidium of Eugonocare (Pseudeugonocare) bispinatum (Kobayashi, 1962) is described from the Cambrian Machari Formation of Korea. The abnormality is represented by the development of two additional posterolateral spines on the left side. This feature probably resulted from a genetic defect. The nonlethal mutation caused formation on one side only of a spine array that mimics the spine arrangement of several Eugonocare species combined.

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JEONG GU LEE, DUCK K. CHOI, and BRIAN R. PRATT "A TERATOLOGICAL PYGIDIUM OF THE UPPER CAMBRIAN TRILOBITE EUGONOCARE (PSEUDEUGONOCARE) BISPINATUM FROM THE MACHARI FORMATION, KOREA," Journal of Paleontology 75(1), 216-218, (1 January 2001). https://doi.org/10.1666/0022-3360(2001)075<0216:ATPOTU>2.0.CO;2

Accepted: 1 July 2000; Published: 1 January 2001

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