Project 4304: J. N. Biewer, J. Velez-Juarbe, J. F. Parham. 2020. Insights on the Dental Evolution of Walruses Based on New Fossil Specimens from California. Journal of Vertebrate Paleontology. 40 (5):e1833896.
Abstract
Twelve new specimens of fossil walruses are described from four Miocene units in California. The new material represents five taxa: (1) a specimen from the Santa Margarita Formation referred to Imagotaria downsi; (2) a specimen from the Valmonte Diatomite Member of the Monterey Formation referred to cf. Pontolis magnus; (3) six specimens from the Monterey Formation referred to a new species of Pontolis (Pontolis barroni, sp. nov.); (4) one specimen from the Oso Member of the Capistrano Formation referred to a new species of Pontolis (Pontolis kohnoi, sp. nov.); (5) three specimens from the Oso Member referred to a new genus and species (Osodobenus eodon, gen. et sp. nov.). A phylogenetic analysis suggests that both the Dusignathinae and an expanded concept of the genus Pontolis represent monophyletic groups. We provide phylogenetic definitions for clade names of odobenids. Two of the new species are represented by specimens of males, females, and juveniles. Analysis of these specimens shows that the dental anatomy of later diverging basal odobenids is more variable than previously considered. The specific pattern of variation is lineage specific and likely corresponds to the intermediate dental morphology of late Miocene odobenids. Osodobenus eodon, gen. et sp. nov., is the first basal odobenid with tusk-like canines, a longitudinally arched palate, and an enlarged infraorbital foramen. These features are plausibly correlated with benthic suction feeding in the odobenins (Pliocene to Recent) and so Os. eodon may represent a case of convergent evolution of benthic feeding in the late Miocene.Read the article »
Article DOI: 10.1080/02724634.2020.1833896
Project DOI: 10.7934/P4304, http://dx.doi.org/10.7934/P4304
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 2166 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 91 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 239 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:91/0 |
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MorphoBank Project 4304
MorphoBank Project 4304
- Creation Date:
06 July 2022 - Publication Date:
07 July 2022 - Project views: 4651
- Matrix downloads: 1
This research
supported by
Authors' Institutions
- National Museum of Natural History, Smithsonian Institution
- California State University - Fullerton
- Natural History Museum of Los Angeles County
- Smithsonian Institution
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
Katherine Walton Project Administrator | 29 | 1 | 1 | 91 | 0 | 0 | 2166 (2166, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M28837' (29 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] Monachus monachus Last Modified in 07/06/22 | 1 | 90 | 90 | 0 | 0 | 0 | 0 | 1 |
[2] † Enaliarctos emlongi Last Modified in 07/07/22 | 8 | 83 | 83 | 0 | 0 | 0 | 0 | 1 |
[3] † Pteronarctos goedertae Last Modified in 07/07/22 | 8 | 83 | 83 | 0 | 0 | 0 | 0 | 1 |
[4] Callorhinus ursinus Last Modified in 07/06/22 | 1 | 90 | 90 | 0 | 0 | 0 | 0 | 1 |
[5] † Desmatophoca oregonensis Last Modified in 07/07/22 | 7 | 86 | 84 | 0 | 0 | 0 | 0 | 1 |
[6] † Allodesmus gracilis Last Modified in 07/07/22 | 0 | 94 | 91 | 0 | 0 | 0 | 0 | 1 |
[7] Erignathus barbatus Last Modified in 07/06/22 | 0 | 93 | 91 | 0 | 0 | 0 | 0 | 1 |
[8] † Prototaria primigenia Last Modified in 07/07/22 | 47 | 44 | 44 | 0 | 0 | 0 | 0 | 1 |
[9] † Proneotherium repenningi Last Modified in 07/07/22 | 9 | 82 | 82 | 0 | 0 | 0 | 0 | 1 |
[10] † Neotherium mirum Last Modified in 07/07/22 | 2 | 89 | 89 | 0 | 0 | 0 | 0 | 1 |
[11] † Kamtschatarctos sinelnikovae Last Modified in 07/07/22 | 50 | 41 | 41 | 0 | 0 | 0 | 0 | 1 |
[12] † Pseudotaria muramotoi Last Modified in 07/07/22 | 54 | 37 | 37 | 0 | 0 | 0 | 0 | 1 |
[13] † Archaeodobenus akamatsui Last Modified in 07/07/22 | 20 | 71 | 71 | 0 | 0 | 0 | 0 | 1 |
[14] † Pelagiarctos spp. Last Modified in 07/07/22 | 57 | 35 | 34 | 0 | 0 | 0 | 0 | 1 |
[15] † Nanodobenus arandai Last Modified in 07/07/22 | 63 | 28 | 28 | 0 | 0 | 0 | 0 | 1 |
[16] † Titanotaria orangensis Last Modified in 07/07/22 | 8 | 83 | 83 | 0 | 0 | 0 | 0 | 1 |
[17] † Imagotaria downsi Last Modified in 07/07/22 | 3 | 98 | 88 | 0 | 0 | 0 | 0 | 1 |
[18] † Pontolis barroni sp. nov. Last Modified in 07/07/22 | 6 | 95 | 85 | 0 | 0 | 0 | 0 | 1 |
[19] † Pontolis kohnoi sp. nov. Last Modified in 07/07/22 | 12 | 79 | 79 | 0 | 0 | 0 | 0 | 1 |
[20] † Cf. pontolis magnus Last Modified in 07/07/22 | 2 | 97 | 89 | 0 | 0 | 0 | 0 | 1 |
[21] † Osodobenus eodon gen. et sp. nov. Last Modified in 07/07/22 | 12 | 84 | 79 | 0 | 0 | 0 | 0 | 1 |
[22] † Gomphotaria pugnax Last Modified in 07/07/22 | 13 | 78 | 78 | 0 | 0 | 0 | 0 | 1 |
[23] † Dusignathus seftoni Last Modified in 07/07/22 | 14 | 79 | 77 | 0 | 0 | 0 | 0 | 1 |
[24] † Dusignathus santacruzensis Last Modified in 07/07/22 | 36 | 56 | 55 | 0 | 0 | 0 | 0 | 1 |
[25] † Aivukus cedrosensis Last Modified in 07/07/22 | 30 | 61 | 61 | 0 | 0 | 0 | 0 | 1 |
[26] † Protodobenus japonicus Last Modified in 07/07/22 | 27 | 64 | 64 | 0 | 0 | 0 | 0 | 1 |
[27] † Ontocetus emmonsi Last Modified in 07/07/22 | 3 | 88 | 88 | 0 | 0 | 0 | 0 | 1 |
[28] † Valenictus chulavistensis Last Modified in 07/07/22 | 22 | 69 | 69 | 0 | 0 | 0 | 0 | 1 |
[29] Odobenus rosmarus Last Modified in 07/07/22 | 2 | 89 | 89 | 0 | 0 | 0 | 0 | 1 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 4651 | |
Project overview | 369 | |
Matrix views | 270 | Matrix landing page (248 views); Bieweretal Odobenid Matrix R1 (22 views); |
Media views | 956 | Media search (803 views); M845225 (153 views); |
Taxon list | 1990 | |
Specimen list | 565 | |
Views for media list | 309 | |
Bibliography | 190 | |
Documents list | 2 |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 2 | |
Project downloads | 1 | |
Matrix downloads | 1 | Bieweretal Odobenid Matrix R1 (1 download); |