Nautilida

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(Introduction: modified section)
(Evolutionary History: modified picture explanation)
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==Evolutionary History==
==Evolutionary History==
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[[Image:Cenoceras trechmanni.gif|thumb|680px|center|The oldest nautilid, ''[[Cenoceras trechmanni]]'' (Kummel), [[Carnian]] of New Zealand. A, Ventral view B. Lateral view. Height about 7 cm  
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[[Image:Cenoceras trechmanni.gif|thumb|680px|center|The oldest of the nautilidae, ''[[Cenoceras|Cenoceras trechmanni]]'' (Kummel), [[Carnian]] of New Zealand. A, Ventral view B. Lateral view. Height about 7 cm  
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(after Kummel 1953, from Teichert 1967, from Teichert 1988).]]
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(after Kummel 1953).]]
The Nautilida have a rich and complex evolutionary history. The details of [[taxonomy]] and [[phylogenetics]] remain obscure, but the general pattern is clear. This [[clade]], the last of the major groups of [[Palcephalopoda]] to evolve, are also the most successful. The following account is by Teichert (1988):
The Nautilida have a rich and complex evolutionary history. The details of [[taxonomy]] and [[phylogenetics]] remain obscure, but the general pattern is clear. This [[clade]], the last of the major groups of [[Palcephalopoda]] to evolve, are also the most successful. The following account is by Teichert (1988):
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:Interestingly, the nautilids were not affected by the wave of extinctions at the Cretaceous - Tertiary boundary which wiped out their close relatives, the ammonoids; three families and at least five genera of nautilids crossed this boundary and the [[Paleocene]] and [[Eocene]] saw a resurgence of nautilids, with several new genera added, most of which were of worldwide distribution (Miller, 1949; Kummel, 1956; Shimanskiy, 1979).
:Interestingly, the nautilids were not affected by the wave of extinctions at the Cretaceous - Tertiary boundary which wiped out their close relatives, the ammonoids; three families and at least five genera of nautilids crossed this boundary and the [[Paleocene]] and [[Eocene]] saw a resurgence of nautilids, with several new genera added, most of which were of worldwide distribution (Miller, 1949; Kummel, 1956; Shimanskiy, 1979).
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==Taxonomy==
==Taxonomy==

Revision as of 23:46, 8 December 2011

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