Nautilida

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(Taxonomy: improved naming and order of taxa)
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==Conch Shape==
==Conch Shape==
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Although in Devonian times the shells of nautilids were varied in shape, ranging from [[cyrtoconic]] through [[gyroconic]] to tightly coiled and [[involute]], later on the loosely coiled and cyrtoconic shells became rare or disappeared altogether except in the superfamily [[Aipocerataceae]]. Nautiloids thenceforth conformed to the standard [[planispiral]] [[evolute]], [[convolute]], and involute conch shape (the modern pearly nautilus displays the tightly coiled involute form).
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Although in Devonian times the shells of nautilids were varied in shape, ranging from [[cephalopod shell morphology|cyrtoconic]] through [[cephalopod shell morphology|gyroconic]] to tightly coiled and [[cephalopod shell morphology|involute]], later on the loosely coiled and cyrtoconic shells became rare or disappeared altogether except in the superfamily [[Aipocerataceae]]. Nautiloids thenceforth conformed to the standard [[cephalopod shell morphology|planispiral]] [[cephalopod shell morphology|evolute]], [[cephalopod shell morphology|convolute]], and involute conch shape (the modern pearly nautilus displays the tightly coiled involute form).
Explains Teichert (1988):
Explains Teichert (1988):

Revision as of 13:08, 10 January 2009

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