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
Project views: 802
Media downloads: 1

Authors' Institutions

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

American Museum of Natural History

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 Last Modified in 03/07/24	38	183	183	0	1	0	0	1
[2] † Acronemus Last Modified in 03/07/24	95	128	127	0	0	0	0	1
[3] † Akmonistion Last Modified in 03/07/24	49	173	173	0	0	0	0	1
[4] † Antarctilamna Last Modified in 03/07/24	144	78	78	0	0	0	0	1
[5] Callorhinchus Last Modified in 05/30/22	27	194	194	0	1	0	0	1
[6] † Carcharopsis Last Modified in 03/07/24	140	82	82	0	0	0	0	1
[7] † Chondrenchelys Last Modified in 03/07/24	95	128	127	0	0	0	0	1
[8] † Cladodoides Last Modified in 03/07/24	104	118	118	0	0	0	0	1
[9] † Cladoselache Last Modified in 03/07/24	77	145	145	0	0	0	0	1
[10] † Climatius Last Modified in 03/07/24	137	85	85	0	0	0	0	1
[11] † Cobelodus Last Modified in 03/07/24	74	148	148	0	0	0	0	1
[12] † Cosmoselachus Last Modified in 03/07/24	136	86	86	0	0	0	0	1
[13] † Cowralepis Last Modified in 03/07/24	156	66	66	0	0	0	0	1
[14] † Debeerius Last Modified in 03/07/24	64	157	157	0	1	0	0	1
[15] † Dicksonosteus Last Modified in 03/07/24	82	139	139	0	1	0	0	1
[16] † Doliodus Last Modified in 03/07/24	102	120	120	0	0	0	0	1
[17] † Dwykaselachus Last Modified in 03/07/24	125	97	97	0	0	0	0	1
[18] † Egertonodus Last Modified in 03/07/24	21	201	201	0	0	0	0	1
[19] † Entelognathus Last Modified in 03/07/24	134	87	87	0	1	0	0	1
[20] † Ferromirum Last Modified in 03/07/24	106	101	101	0	15	0	0	1
[21] † Gladbachus Last Modified in 03/07/24	91	131	131	0	0	0	0	1
[22] † Guiyu Last Modified in 03/07/24	119	103	103	0	0	0	0	1
[23] † Gydoselache Last Modified in 03/07/24	114	108	108	0	0	0	0	1
[24] † Gyracanthides Last Modified in 03/07/24	170	52	52	0	0	0	0	1
[25] † Hamiltonichthys Last Modified in 03/07/24	88	134	134	0	0	0	0	1
[26] † Helodus Last Modified in 03/07/24	70	153	152	0	0	0	0	1
[27] † Iniopera Last Modified in 03/07/24	51	171	171	0	0	0	0	1
[28] † Ischnacanthus Last Modified in 03/07/24	132	90	90	0	0	0	0	1
[29] † Janusiscus Last Modified in 03/07/24	155	67	67	0	0	0	0	1
[30] † Kawichthys Last Modified in 03/07/24	136	86	86	0	0	0	0	1
[31] † Ligulalepis Last Modified in 03/07/24	145	77	77	0	0	0	0	1
[32] † Lupopsyrus Last Modified in 03/07/24	153	69	69	0	0	0	0	1
[33] † Mimipiscis Last Modified in 03/07/24	30	192	192	0	0	0	0	1
[34] Notorynchus Last Modified in 05/30/22	29	193	193	0	0	0	0	1
[35] † Onychoselache Last Modified in 03/07/24	117	105	105	0	0	0	0	1
[36] † Orthacanthus Last Modified in 03/07/24	33	189	189	0	0	0	0	1
[37] † Ozarcus Last Modified in 03/07/24	68	154	154	0	0	0	0	1
[38] † Phoebodus Last Modified in 03/07/24	84	138	138	0	0	0	0	1
[39] † Psarolepis Last Modified in 03/07/24	112	110	110	0	0	0	0	1
[40] † Ptomacanthus Last Modified in 03/07/24	120	102	102	0	0	0	0	1
[41] † Pucapampella Last Modified in 03/07/24	110	112	112	0	0	0	0	1
[42] † Ramirosuarezia Last Modified in 03/07/24	155	67	67	0	0	0	0	1
[43] Scyliorhinus Last Modified in 05/30/22	28	194	194	0	0	0	0	1
[44] Squalus Last Modified in 05/30/22	15	207	207	0	0	0	0	1
[45] † Synechodus Last Modified in 03/07/24	100	122	122	0	0	0	0	1
[46] † Tamiobatis Last Modified in 03/07/24	83	139	139	0	0	0	0	1
[47] † Tribodus Last Modified in 03/07/24	27	196	195	0	0	0	0	1
[48] † Tristychius Last Modified in 03/07/24	26	196	196	0	0	0	0	1

Project views

type	number of views	Individual items viewed (where applicable)
Total project views	802
Project overview	58
Bibliography	26
Documents list	32
Media views	138	Media search (116 views); M902539 (22 views);
Matrix views	36	Matrix landing page (33 views); Matrix from "A new operculate symmoriiform chondrichthyan from the Late Mississippian Fayetteville Shale (Arkansas, USA)" (May 2022) (3 views);
Taxon list	406
Specimen list	70
Views for media list	36

Project downloads

type	number of downloads	Individual items downloaded (where applicable)
Total downloads from project	4
Project downloads	3
Media downloads	1	M902539 (1 download);