Project 4904: T. M. Sanchez. 2008. The early bivalve radiation in the Ordovician Gondwanan basins of Argentina. Alcheringa: An Australasian Journal of Palaeontology. 32 (3):223-246.
Abstract
The Ordovician diversification is marked by an increase in both marine diversity and ecospace occupation. Bivalves, like other groups, underwent a remarkable diversification in the Early Ordovician. The early phases of such a bivalve diversification took place in the Gondwanan basins of western Argentina. In the Northwestern Argentina (NWA) Basin, three clades originated during late Tremadocian–Floian times. In the Floian successions of the Famatina Basin, a probable basal arcoid is recorded. Genera from these two basins belong to 13 families. Phylogenetic analysis of the NWA heteroconchian bivalves indicates that redoniids and coxiconchinids may have originated during this radiation event. This taxonomic radiation also implies an ecological diversification. Ten guilds are recognized on the basis of bauplan, mode of life, and feeding types. Lifestyles included free endofaunal, free semi-endofaunal, semi-endobyssate, and epibyssate; feeding types included suspensivorous and detritivorous habits. Physiological changes imposed by colonization of low-salinity environments also account for guild definitions. Recent discoveries of Tremadoc to early Darriwilian bivalves from the NWA and Famatina basins indicate that the dominance of higher groups (e.g. Heteroconchia, Pteriomorphia) deviates from the patterns evident in other Gondwanan basins. This agrees with previous ideas supporting the importance of local radiations during the Ordovician diversification. Two new taxa are described, Eoredonia orientalis gen. et sp. nov. and Babinka notica sp. nov., and Coxiconchia sellaensis Sánchez & Babin is first reported from the NWA Basin.Read the article »
Article DOI: 10.1080/03115510802096044
Project DOI: 10.7934/P4904, http://dx.doi.org/10.7934/P4904
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 147 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 13 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 42 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:13/0 |
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MorphoBank Project 4904
MorphoBank Project 4904
- Creation Date:
03 October 2023 - Publication Date:
26 November 2023 - Project views: 1426
Authors' Institutions
- Universidad Nacional de Cordoba (UNC)
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
Shreya Jariwala Project Administrator | 12 | 1 | 1 | 13 | 0 | 0 | 147 (147, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M29505' (11 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Fordilla troyensis Last Modified in 10/03/23 | 0 | 13 | 13 | 0 | 0 | 0 | 0 | 1 |
[2] † Intihuarella simplicidentata Last Modified in 10/03/23 | 0 | 14 | 13 | 0 | 0 | 0 | 0 | 1 |
[3] † Cienagomya bidentata Last Modified in 10/03/23 | 0 | 13 | 13 | 0 | 0 | 0 | 0 | 1 |
[4] † Babinka notia Last Modified in 10/03/23 | 0 | 13 | 13 | 0 | 0 | 0 | 0 | 1 |
[5] † Coxiconchia babini Last Modified in 10/03/23 | 1 | 12 | 12 | 0 | 0 | 0 | 0 | 1 |
[6] † Coxiconchia sellaensis Last Modified in 10/03/23 | 0 | 14 | 13 | 0 | 0 | 0 | 0 | 1 |
[7] † Eoredonia orientalis Last Modified in 10/03/23 | 0 | 14 | 13 | 0 | 0 | 0 | 0 | 1 |
[8] † Redonia riojana Last Modified in 10/03/23 | 0 | 15 | 13 | 0 | 0 | 0 | 0 | 1 |
[9] † Redonia condorensis Last Modified in 10/03/23 | 0 | 14 | 13 | 0 | 0 | 0 | 0 | 1 |
[10] † Pseudoredonia radialis Last Modified in 10/03/23 | 1 | 12 | 12 | 0 | 0 | 0 | 0 | 1 |
[11] † Konduria coloradoensis Last Modified in 10/03/23 | 0 | 13 | 13 | 0 | 0 | 0 | 0 | 1 |
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Total project views | 1426 | |
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Media views | 363 | Media search (317 views); M897147 (46 views); |
Bibliography | 66 | |
Views for media list | 97 | |
Specimen list | 116 | |
Taxon list | 489 |