Morphobank

Project 3996: A. W. Bronson, A. Pradel, J. S. Denton, J. G. Maisey. 2024. A new operculate symmoriiform chondrichthyan from the Late Mississippian Fayetteville Shale (Arkansas, United States). Geodiversitas. 46 (4):101-117.

Specimen: † Cosmoselachus (AMNH/FF:20509)
View: ventral view of specimen with highlighted operculum

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Abstract

We describe a new genus of symmoriiform chondrichthyan from the Late Mississippian Fayetteville Shale of Arkansas, USA and include this fossil in a phylogenetic analysis of chondrichthyans. This taxon possesses elongate cartilaginous rays extending from the gill arches, forming an operculate structure that covers at least two of the branchial arches farther posteriorly. Although presence of a ‘hyoid operculum’ has been postulated in at least two unrelated Paleozoic sharks (e.g., Triodus,Tristychius), subsequent investigations failed to corroborate those claims. The new fossil therefore provides the first evidence of an endoskeletal operculum formed by elongate, fused pharyngeal arch rays in a chondrichthyan.

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Article DOI: 10.5252/geodiversitas2024v46a4

Project DOI: 10.7934/P3996, http://dx.doi.org/10.7934/P3996

This project contains	Matrices
1 Media 1 Matrix 4 Documents 48 Taxa 1 Specimen 222 Characters Total size of project's media files: 14.61M Download Project SDD File	Total scored cells: 6193 Total media associated with cells: 0 Total labels associated with cell media: 0
	Characters
	Total characters: 222 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 500 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:222/0

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MorphoBank Project 3996

Creation Date:
02 May 2021
Publication Date:
07 March 2024
Media downloads: 1

Authors' Institutions

Muséum national d'Histoire naturelle, Paris (Natural History Museum, Paris)

American Museum of Natural History (AMNH)

Florida Museum of Natural History

California State Polytechnic University, Humboldt

Members

Allison Bronson
Project Administrator

222

6193
(6173, 0, 20)

Taxonomic Overview for Matrix 'M28783' (48 Taxa)

taxon	unscored cells	scored cells	no cell support	NPA cells	"-" cells	cell images	labels on cell images	member access
[1] † Acanthodes Taxon name last Modified on 03/07/24	38	183	183	0	1	0	0	1
[2] † Acronemus Taxon name last Modified on 03/07/24	95	128	127	0	0	0	0	1
[3] † Akmonistion Taxon name last Modified on 03/07/24	49	173	173	0	0	0	0	1
[4] † Antarctilamna Taxon name last Modified on 03/07/24	144	78	78	0	0	0	0	1
[5] Callorhinchus Taxon name last Modified on 05/30/22	27	194	194	0	1	0	0	1
[6] † Carcharopsis Taxon name last Modified on 03/07/24	140	82	82	0	0	0	0	1
[7] † Chondrenchelys Taxon name last Modified on 03/07/24	95	128	127	0	0	0	0	1
[8] † Cladodoides Taxon name last Modified on 03/07/24	104	118	118	0	0	0	0	1
[9] † Cladoselache Taxon name last Modified on 03/07/24	77	145	145	0	0	0	0	1
[10] † Climatius Taxon name last Modified on 03/07/24	137	85	85	0	0	0	0	1
[11] † Cobelodus Taxon name last Modified on 03/07/24	74	148	148	0	0	0	0	1
[12] † Cosmoselachus Taxon name last Modified on 03/07/24	136	86	86	0	0	0	0	1
[13] † Cowralepis Taxon name last Modified on 03/07/24	156	66	66	0	0	0	0	1
[14] † Debeerius Taxon name last Modified on 03/07/24	64	157	157	0	1	0	0	1
[15] † Dicksonosteus Taxon name last Modified on 03/07/24	82	139	139	0	1	0	0	1
[16] † Doliodus Taxon name last Modified on 03/07/24	102	120	120	0	0	0	0	1
[17] † Dwykaselachus Taxon name last Modified on 03/07/24	125	97	97	0	0	0	0	1
[18] † Egertonodus Taxon name last Modified on 03/07/24	21	201	201	0	0	0	0	1
[19] † Entelognathus Taxon name last Modified on 03/07/24	134	87	87	0	1	0	0	1
[20] † Ferromirum Taxon name last Modified on 03/07/24	106	101	101	0	15	0	0	1
[21] † Gladbachus Taxon name last Modified on 03/07/24	91	131	131	0	0	0	0	1
[22] † Guiyu Taxon name last Modified on 03/07/24	119	103	103	0	0	0	0	1
[23] † Gydoselache Taxon name last Modified on 03/07/24	114	108	108	0	0	0	0	1
[24] † Gyracanthides Taxon name last Modified on 03/07/24	170	52	52	0	0	0	0	1
[25] † Hamiltonichthys Taxon name last Modified on 03/07/24	88	134	134	0	0	0	0	1
[26] † Helodus Taxon name last Modified on 03/07/24	70	153	152	0	0	0	0	1
[27] † Iniopera Taxon name last Modified on 03/07/24	51	171	171	0	0	0	0	1
[28] † Ischnacanthus Taxon name last Modified on 03/07/24	132	90	90	0	0	0	0	1
[29] † Janusiscus Taxon name last Modified on 03/07/24	155	67	67	0	0	0	0	1
[30] † Kawichthys Taxon name last Modified on 03/07/24	136	86	86	0	0	0	0	1
[31] † Ligulalepis Taxon name last Modified on 03/07/24	145	77	77	0	0	0	0	1
[32] † Lupopsyrus Taxon name last Modified on 03/07/24	153	69	69	0	0	0	0	1
[33] † Mimipiscis Taxon name last Modified on 03/07/24	30	192	192	0	0	0	0	1
[34] Notorynchus Taxon name last Modified on 05/30/22	29	193	193	0	0	0	0	1
[35] † Onychoselache Taxon name last Modified on 03/07/24	117	105	105	0	0	0	0	1
[36] † Orthacanthus Taxon name last Modified on 03/07/24	33	189	189	0	0	0	0	1
[37] † Ozarcus Taxon name last Modified on 03/07/24	68	154	154	0	0	0	0	1
[38] † Phoebodus Taxon name last Modified on 03/07/24	84	138	138	0	0	0	0	1
[39] † Psarolepis Taxon name last Modified on 03/07/24	112	110	110	0	0	0	0	1
[40] † Ptomacanthus Taxon name last Modified on 03/07/24	120	102	102	0	0	0	0	1
[41] † Pucapampella Taxon name last Modified on 03/07/24	110	112	112	0	0	0	0	1
[42] † Ramirosuarezia Taxon name last Modified on 03/07/24	155	67	67	0	0	0	0	1
[43] Scyliorhinus Taxon name last Modified on 05/30/22	28	194	194	0	0	0	0	1
[44] Squalus Taxon name last Modified on 05/30/22	15	207	207	0	0	0	0	1
[45] † Synechodus Taxon name last Modified on 03/07/24	100	122	122	0	0	0	0	1
[46] † Tamiobatis Taxon name last Modified on 03/07/24	83	139	139	0	0	0	0	1
[47] † Tribodus Taxon name last Modified on 03/07/24	27	196	195	0	0	0	0	1
[48] † Tristychius Taxon name last Modified on 03/07/24	26	196	196	0	0	0	0	1

Project downloads

type	number of downloads	Individual items downloaded (where applicable)
Total downloads from project	5
Project downloads	4
Media downloads	1	M902539 (1 download);