Morphobank

Project 4832: A. J. McGowan, A. B. Smith. 2007. Ammonoids across the Permian/Triassic boundary: a cladistic perspective. Palaeontology. 50 (3):573-590.

Specimen: † Episageceras (unvouchered)
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Abstract

The rapid diversification of ceratitid ammonoids during the earliest Mesozoic has been taken at face value as an example of explosive radiation following the Permian/Triassic mass extinction. However, the validity of this interpretation has never been tested within a phylogenetic framework. A total evidence cladistic analysis of Mid–Late Permian and Induan (earliest Triassic) ammonoids confirms the monophyly of the Ceratitida. Partitioned phylogenetic analysis of suture line characters vs. shell shape and ornament characters confirms the importance of suture-line characters for resolving the higher taxonomy of ammonoids. When the cladogram is compared with the observed fossil record, the resultant tree implies that the divergence of a number of early Triassic lineages actually occurred during the latest Permian. If these range extensions are taken into account the ammonoid per-genus extinction rate across the Permian/Triassic boundary drops from c. 85 per cent to c. 60 per cent.

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Article DOI: 10.1111/j.1475-4983.2007.00653.x

Project DOI: 10.7934/P4832, http://dx.doi.org/10.7934/P4832

This project contains	Matrices
1 Media 1 Matrix 1 Document 32 Taxa 1 Specimen 55 Characters Total size of project's media files: 429.92k Download Project SDD File	Total scored cells: 1672 Total media associated with cells: 0 Total labels associated with cell media: 0
	Characters
	Total characters: 55 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 135 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:52/3

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MorphoBank Project 4832

Creation Date:
14 August 2023
Publication Date:
20 August 2023

Authors' Institutions

Natural History Museum, London

Members

Joyce Song
Project Administrator

1672
(1672, 0, 0)

Taxonomic Overview for Matrix 'M29442' (32 Taxa)

taxon	unscored cells	scored cells	no cell support	NPA cells	"-" cells	cell images	labels on cell images	member access
[1] † Daraelites Taxon name last Modified on 08/14/23	2	53	53	0	0	0	0	1
[2] † Episageceras Taxon name last Modified on 08/14/23	6	49	49	0	0	0	0	1
[3] † Medlicottia Taxon name last Modified on 08/14/23	5	50	50	0	0	0	0	1
[4] † Discophiceras Taxon name last Modified on 08/14/23	0	55	55	0	0	0	0	1
[5] † Bukkenites Taxon name last Modified on 08/14/23	0	55	55	0	0	0	0	1
[6] † Xenodiscus Taxon name last Modified on 08/14/23	0	55	55	0	0	0	0	1
[7] † Hypophiceras Taxon name last Modified on 08/14/23	0	55	55	0	0	0	0	1
[8] † Tompophiceras Taxon name last Modified on 08/14/23	0	55	55	0	0	0	0	1
[9] † Paratirolites Taxon name last Modified on 08/14/23	1	54	54	0	0	0	0	1
[10] † Aldanoceras Taxon name last Modified on 08/14/23	0	55	55	0	0	0	0	1
[11] † Wordieoceras Taxon name last Modified on 08/14/23	0	55	55	0	0	0	0	1
[12] † Vishnuites Taxon name last Modified on 08/14/23	0	55	55	0	0	0	0	1
[13] † Acanthophiceras Taxon name last Modified on 08/14/23	0	55	55	0	0	0	0	1
[14] † Metophiceras Taxon name last Modified on 08/14/23	0	55	55	0	0	0	0	1
[15] † Vavilovites Taxon name last Modified on 08/14/23	0	55	55	0	0	0	0	1
[16] † Ophiceras Taxon name last Modified on 08/14/23	0	55	55	0	0	0	0	1
[17] † Ambites Taxon name last Modified on 08/14/23	0	55	55	0	0	0	0	1
[18] † Otoceras Taxon name last Modified on 08/14/23	0	55	55	0	0	0	0	1
[19] † Araxoceras Taxon name last Modified on 08/14/23	1	54	54	0	0	0	0	1
[20] † Anotoceras Taxon name last Modified on 08/14/23	1	54	54	0	0	0	0	1
[21] † Agathiceras Taxon name last Modified on 08/14/23	6	49	49	0	0	0	0	1
[22] † Adrianites Taxon name last Modified on 08/14/23	6	49	49	0	0	0	0	1
[23] † Hyattoceras Taxon name last Modified on 08/14/23	7	48	48	0	0	0	0	1
[24] † Cyclobus Taxon name last Modified on 08/14/23	6	49	49	0	0	0	0	1
[25] † Vidrioceras Taxon name last Modified on 08/14/23	6	49	49	0	0	0	0	1
[26] † Marathonites Taxon name last Modified on 08/14/23	5	50	50	0	0	0	0	1
[27] † Metalegoceras Taxon name last Modified on 08/14/23	6	49	49	0	0	0	0	1
[28] † Popanoceras Taxon name last Modified on 08/14/23	6	49	49	0	0	0	0	1
[29] † Thalassoceras Taxon name last Modified on 08/14/23	6	49	49	0	0	0	0	1
[30] † Paragastrioceras Taxon name last Modified on 08/14/23	5	50	50	0	0	0	0	1
[31] † Pseudohalorites Taxon name last Modified on 08/14/23	6	49	49	0	0	0	0	1
[32] † Imitoceras Taxon name last Modified on 08/14/23	7	48	48	0	0	0	0	1