Morphobank

Project 5154: A. Averianov, T. Martin, A. Lopatin, S. Krasnolutskii. 2015. Stem therian mammal Amphibetulimus from the Middle Jurassic of Siberia. Paläontologische Zeitschrift. 89 (2):197-206.

Specimen: † Tinodon bellus (unvouchered)
View: whole specimen (fossil)

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Abstract

Amphibetulimus krasnolutskii is known from the Middle Jurassic (Bathonian) Itat Formation of Krasnoyarsk Territory, West Siberia, Russia, by several edentulous and three dentigerous dental fragments, preserving p1, antepenultimate, and ultimate lower molars, and by an upper molar. It is unique among stem therians by widely open trigonids on the posterior lower molars, paraconids that are higher than the metaconids and have keeled mesiolingual vertical crests, pronounced unilateral hypsodonty of the lower molars and correlated unequal alveolar borders of the dentary ramus, and a linear Meckelian groove that is not connected to the mandibular foramen and extends along the pterygoid ridge. Amphibetulimus differs from more derived stem therians by a simple unicuspid talonid without an incipient talonid basin and a distinct labial cingulum on the upper molars. The lack of an ectotympanic facet and the long linear Meckelian groove extending onto the pterygoid ridge suggest that Amphibetulimus had a derived state of the transitional mammalian middle ear, where the ear ossicles were connected to the dentary not by a thick “ossified” Meckelian cartilage, but by a thin Meckelian cartilage, as in prenatal and early postnatal stages of some modern therians.

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Article DOI: 10.1007/s12542-013-0217-x

Project DOI: 10.7934/P5154, http://dx.doi.org/10.7934/P5154

This project contains	Matrices
4 Media 1 Matrix 1 Document 44 Taxa 4 Specimens 48 Characters Total size of project's media files: 17.3M Download Project SDD File	Total scored cells: 1348 Total media associated with cells: 0 Total labels associated with cell media: 0
	Characters
	Total characters: 48 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 123 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:48/0

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MorphoBank Project 5154

Creation Date:
26 March 2024
Publication Date:
27 March 2024
Matrix downloads: 3

Authors' Institutions

Saint Petersburg State University

Rheinische Friedrich-Wilhelms-Universität Bonn (University of Bonn)

Zoological Institute of the Russian Academy of Sciences

Sharypovo Regional Museum

Borissyak Paleontological Institute of the Russian Academy of Sciences

Members

Shreya Jariwala
Project Administrator

1348
(1348, 0, 0)

Taxonomic Overview for Matrix 'M29739' (44 Taxa)

taxon	unscored cells	scored cells	no cell support	NPA cells	"-" cells	cell images	labels on cell images	member access
[1] † Phascolotherium bucklandi Taxon name last Modified on 03/26/24	33	15	15	0	0	0	0	1
[2] † Amphilestes broderipi Taxon name last Modified on 03/26/24	33	15	15	0	0	0	0	1
[3] † Tinodon bellus Taxon name last Modified on 03/26/24	16	32	32	0	0	0	0	1
[4] † Yermakia domitor Taxon name last Modified on 03/26/24	16	32	32	0	0	0	0	1
[5] † Gobiotheriodon infinitus Taxon name last Modified on 03/26/24	26	22	22	0	0	0	0	1
[6] † Kiyatherium cardiodens Taxon name last Modified on 03/26/24	4	44	44	0	0	0	0	1
[7] † Zhangheotherium quiquecuspidens Taxon name last Modified on 03/26/24	18	30	30	0	0	0	0	1
[8] † Maotherium sinense Taxon name last Modified on 03/26/24	3	45	45	0	0	0	0	1
[9] † Maotherium asiaticum Taxon name last Modified on 03/26/24	10	38	38	0	0	0	0	1
[10] † Spalacotherium tricuspidens Taxon name last Modified on 03/26/24	7	41	41	0	0	0	0	1
[11] † Spalacolestes cretulablatta Taxon name last Modified on 03/26/24	25	23	23	0	0	0	0	1
[12] † Groebertherium stipanicici Taxon name last Modified on 03/26/24	33	15	15	0	0	0	0	1
[13] † Dryolestes priscus Taxon name last Modified on 03/26/24	13	35	35	0	0	0	0	1
[14] † Dryolestes leiriensis Taxon name last Modified on 03/26/24	0	48	48	0	0	0	0	1
[15] † Laolestes eminens Taxon name last Modified on 03/26/24	4	45	44	0	0	0	0	1
[16] † Krebsotherium lusitanicum Taxon name last Modified on 03/26/24	2	46	46	0	0	0	0	1
[17] † Guimarotodus inflatus Taxon name last Modified on 03/26/24	33	15	15	0	0	0	0	1
[18] † Amblotherium gracile Taxon name last Modified on 03/26/24	10	38	38	0	0	0	0	1
[19] † Amblotherium pusillum Taxon name last Modified on 03/26/24	10	38	38	0	0	0	0	1
[20] † Achyrodon nanus Taxon name last Modified on 03/26/24	6	42	42	0	0	0	0	1
[21] † Phascolestes mustelulus Taxon name last Modified on 03/26/24	3	46	45	0	0	0	0	1
[22] † Crusafontia cuencana Taxon name last Modified on 03/26/24	14	34	34	0	0	0	0	1
[23] † Euthlastus cordiformis Taxon name last Modified on 03/26/24	28	20	20	0	0	0	0	1
[24] † Tathiodon agilis Taxon name last Modified on 03/26/24	28	20	20	0	0	0	0	1
[25] † Paurodon valens Taxon name last Modified on 03/26/24	11	37	37	0	0	0	0	1
[26] † Henkelotherium guimarotae Taxon name last Modified on 03/26/24	10	38	38	0	0	0	0	1
[27] † Drescheratherium acutum Taxon name last Modified on 03/26/24	17	31	31	0	0	0	0	1
[28] † Amphitherium prevostii Taxon name last Modified on 03/26/24	32	17	16	0	0	0	0	1
[29] † Palaeoxonodon ooliticus Taxon name last Modified on 03/26/24	30	18	18	0	0	0	0	1
[30] † Amphibetulimus krasnolutskii Taxon name last Modified on 03/26/24	48	0	0	0	0	0	0	1
[31] † Nanolestes drescherae Taxon name last Modified on 03/26/24	10	38	38	0	0	0	0	1
[32] † Arguimus khosbajari Taxon name last Modified on 03/26/24	36	12	12	0	0	0	0	1
[33] † Mozomus shikamai Taxon name last Modified on 03/26/24	37	11	11	0	0	0	0	1
[34] † Peramus tenuirostris Taxon name last Modified on 03/26/24	7	41	41	0	0	0	0	1
[35] † Kielantherium gobiensis Taxon name last Modified on 03/26/24	29	19	19	0	0	0	0	1
[36] † Prokennalestes spp Taxon name last Modified on 03/26/24	2	47	46	0	0	0	0	1
[37] † Vincelestes neuquenianus Taxon name last Modified on 03/26/24	4	44	44	0	0	0	0	1
[38] † Cronopio dentiacutus Taxon name last Modified on 03/26/24	10	39	38	0	0	0	0	1
[39] † Leonardus cuspidatus Taxon name last Modified on 03/26/24	22	26	26	0	0	0	0	1
[40] † Reigitherium bunodontum Taxon name last Modified on 03/26/24	33	15	15	0	0	0	0	1
[41] † Mesungulatum houssayi Taxon name last Modified on 03/26/24	24	24	24	0	0	0	0	1
[42] † Coloniatherium cilinskii Taxon name last Modified on 03/26/24	7	42	41	0	0	0	0	1
[43] † Peligrotherium tropicalis Taxon name last Modified on 03/26/24	11	37	37	0	0	0	0	1
[44] † Necrolestes patagonensis Taxon name last Modified on 03/26/24	15	33	33	0	0	0	0	1

Project downloads

type	number of downloads	Individual items downloaded (where applicable)
Total downloads from project	3
Matrix downloads	3	Aviernov et al 2015 (3 downloads);