Title: Heterochronic evolution in the <i>Heliolites interstinctus‐decipiens</i> lineage of the Chaleur Bay region, eastern Canada
Abstract: LethaiaVolume 23, Issue 1 p. 11-20 Heterochronic evolution in the Heliolites interstinctus-decipiens lineage of the Chaleur Bay region, eastern Canada DONG-JIN LEE, DONG-JIN LEE Dong-Jin Lee and James P. A. Noble, Department of Geology, University of New Brunswick, P.O. Box 4400, Fredericton. New Brunswick. E3B 5A3, CanadaSearch for more papers by this authorGRAHAM A. YOUNG, GRAHAM A. YOUNG Department of Geology, The University, Newcastle upon Tyne, NEI 7RU, UKSearch for more papers by this authorJAMES P. A. NOBEL, JAMES P. A. NOBEL Dong-Jin Lee and James P. A. Noble, Department of Geology, University of New Brunswick, P.O. Box 4400, Fredericton. New Brunswick. E3B 5A3, CanadaSearch for more papers by this author DONG-JIN LEE, DONG-JIN LEE Dong-Jin Lee and James P. A. Noble, Department of Geology, University of New Brunswick, P.O. Box 4400, Fredericton. New Brunswick. E3B 5A3, CanadaSearch for more papers by this authorGRAHAM A. YOUNG, GRAHAM A. YOUNG Department of Geology, The University, Newcastle upon Tyne, NEI 7RU, UKSearch for more papers by this authorJAMES P. A. NOBEL, JAMES P. A. NOBEL Dong-Jin Lee and James P. A. Noble, Department of Geology, University of New Brunswick, P.O. Box 4400, Fredericton. New Brunswick. E3B 5A3, CanadaSearch for more papers by this author First published: January 1990 https://doi.org/10.1111/j.1502-3931.1990.tb01777.xCitations: 2AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract A study of the Heliolites interstinctus-decipiens lineage from the Silurian of the Chalcur Bay region, eastern Canada, indicates that most morphological characters of this lineage, including tabularium diameter, coenenchymal tubule diameter and corallite spacing, remain relatively invariate through a Llandovery to Pridoli interval of about 20 million years. In contrast, septal development and corallite wall erenulation show pronounced evolutionary changes due to heterochrony, as shown by comparison of astogenies throughout the lineage. The reduction of septa and the replacement of crenulate corallites by smooth ones in the ‘decipiens’ type descendent appear to have been by paedomorphosis from the ‘interstinctus’ type ancestor. The problems of speciation in this lineage are discussed including the alternative hypotheses of a speciation event in the early Ludlow or a phyletic trend within a single species whose longevity is due in part to the stabilization processes of niche separation. Citing Literature Volume23, Issue1January 1990Pages 11-20 RelatedInformation
Publication Year: 1990
Publication Date: 1990-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 7
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