Aptychi: the myth of the ammonite operculum
作者:
NICOL MORTON,
期刊:
Lethaia
(WILEY Available online 1981)
卷期:
Volume 14,
issue 1
页码: 57-61
ISSN:0024-1164
年代: 1981
DOI:10.1111/j.1502-3931.1981.tb01074.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
Re‐examination of ammonite specimens with the aptychus apparently in place closing the aperture has shown that these are accidents of preservation and have been misinterpreted as indicating that aptychi functioned as opercula. There remain no convincing grounds for doubting that aptychi functioned only as lower jaws of ammonites, not as opercula. Chance preservation of exceptional specimens can sometimes be misleading.Ammonoidea, aptychi, anoptychi, functional morpholog
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