Project 4992: D. E. Perez, A. A. Berezovsky. 2024. Phylogenetic relationships of Malarossia Berezovsky (Eocene, Ukraine) and trends in the size evolution of the carditids (Bivalvia, Carditidae). Papers in Palaeontology. 10 (3):e1578.
Specimen: † Malarossia eos (Bv/Bv:300/3)
View: Right valve

Abstract

Phylogenetic studies of fossil bivalves are crucial for understanding evolution in both extinct and extant species, and the family Carditidae has received limited research attention in this regard. The endemic genus Malarossia comes from the Eocene deposits of Ukraine and the diversity of carditids during this time have been broadly described from North America and Western Europe, although little is known beyond these regions. The aim of this study is to explore the phylogenetic position of the genus Malarossia and discuss trends in shell size among carditids. To accomplish this, a phylogenetic analysis was conducted using 51 species and 153 morphological characters. Our findings indicate that Malarossia represents an early diverging genus within the subfamily Scalaricarditinae, supported by morphological characters related to development and number of radial ribs, placement of pallial line, and umbones, among others. A wide range in shell size can be seen among carditids, with average values ranging from 3 to 100 mm. Notably, the larger sizes were predominantly observed during the Paleocene–Eocene, in the Venericorini. The Miodomeridinae and Scalaricarditinae had the smallest shell sizes, spanning from the Eocene to the present. Paedomorphic heterochronic processes are suggested for the origin of the small size observed in the Scalaricarditinae subfamily.


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Article DOI: 10.1002/spp2.1578

Project DOI: 10.7934/P4992, http://dx.doi.org/10.7934/P4992
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 51 Taxa
  • 1 Specimen
  • 153 Characters
Total size of project's media files: 678.13k

Download Project SDD File
Total scored cells: 7703
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 153
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 436
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:136/17
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MorphoBank Project 4992

    Authors' Institutions

    • Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)

    • Instituto Patagónico de Geología y Paleontología, CCT CONICET-CENPAT

    • Krivoi Rog National University



    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Damián Perez
    Project Administrator
    5111153007703
    (7430, 0, 273)
    000


    Taxonomic Overview for Matrix 'M29573' (51 Taxa)

    taxon unscored
    cells
    scored
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    "-" cellscell images labels on
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    [1] † Crassatella ponderosa
    Taxon name last Modified on 06/11/24
    3114114036001
    [2] † Astarte sulcata
    Taxon name last Modified on 06/11/24
    1116116036001
    [3] † Palaeocardita crenata
    Taxon name last Modified on 06/11/24
    3140140010001
    [4] † Claibornicardia alticostata
    Taxon name last Modified on 06/11/24
    214714704001
    [5] † Rotundicardia rotunda
    Taxon name last Modified on 06/11/24
    214714704001
    [6] † Kalelia multicostata
    Taxon name last Modified on 06/11/24
    214714704001
    [7] † Glyptoactis hadra
    Taxon name last Modified on 06/11/24
    214714704001
    [8] † Baluchicardia beaumonti
    Taxon name last Modified on 06/11/24
    214714704001
    [9] Purpurocardia purpurata
    Taxon name last Modified on 12/12/23
    214714704001
    [10] † Darwinicardia patagonica
    Taxon name last Modified on 06/11/24
    215014704001
    [11] † Darwinicardia angusticostata
    Taxon name last Modified on 06/11/24
    214714704001
    [12] † Venericardia imbricata
    Taxon name last Modified on 06/11/24
    214714704001
    [13] † Venericardia eudaedalea
    Taxon name last Modified on 06/11/24
    214714704001
    [14] † Paraglans calcitrapoides
    Taxon name last Modified on 06/11/24
    214714704001
    [15] † Arcturellina asperula
    Taxon name last Modified on 06/11/24
    214714704001
    [16] Cardiocardita ajar
    Taxon name last Modified on 12/12/23
    214714704001
    [17] Cardites antiquatus
    Taxon name last Modified on 06/11/24
    214714704001
    [18] † Cardites partschii
    Taxon name last Modified on 06/11/24
    214714704001
    [19] † Xenocardita lacunaris
    Taxon name last Modified on 06/11/24
    114814804001
    [20] † Leuroactis pilsbryi
    Taxon name last Modified on 06/11/24
    314714604001
    [21] † Pacificor mulleri
    Taxon name last Modified on 06/11/24
    314614604001
    [22] † Megacardita jouanetti
    Taxon name last Modified on 06/11/24
    314614604001
    [23] † Venericor planicosta
    Taxon name last Modified on 06/11/24
    314714604001
    [24] † Neovenericor austroplata
    Taxon name last Modified on 06/11/24
    314614604001
    [25] Beguina semiorbiculata
    Taxon name last Modified on 12/12/23
    1013913904001
    [26] Cardita variegata
    Taxon name last Modified on 12/12/23
    214714704001
    [27] Thecalia concamerata
    Taxon name last Modified on 12/12/23
    214714704001
    [28] Carditamera floridana
    Taxon name last Modified on 12/12/23
    214714704001
    [29] Byssomera affinis
    Taxon name last Modified on 12/12/23
    214714704001
    [30] Glans trapezia
    Taxon name last Modified on 12/12/23
    214714704001
    [31] Centrocardita aculeata
    Taxon name last Modified on 12/12/23
    214714704001
    [32] † Kolmeris tehuelchana
    Taxon name last Modified on 06/11/24
    214714704001
    [33] † Miodomeris cossmanni
    Taxon name last Modified on 06/11/24
    214914902001
    [34] Miodontiscus prolongatus
    Taxon name last Modified on 12/12/23
    214714704001
    [35] Pteromeris perplana
    Taxon name last Modified on 12/12/23
    214714704001
    [36] † Scalaricardita scalaris
    Taxon name last Modified on 06/11/24
    114814804001
    [37] † Scalaricardita chamaeformis
    Taxon name last Modified on 06/11/24
    114814804001
    [38] Vimentum dilectum
    Taxon name last Modified on 12/12/23
    214714704001
    [39] † Coripia unidentata
    Taxon name last Modified on 06/11/24
    214814704001
    [40] † Malarossia eos
    Taxon name last Modified on 06/11/24
    214714704001
    [41] Pleuromeris tridentata
    Taxon name last Modified on 12/12/23
    114814804001
    [42] † Pleuromeris decemcostata
    Taxon name last Modified on 06/11/24
    114814804001
    [43] † Oesterheldia cannada
    Taxon name last Modified on 06/11/24
    214814704001
    [44] Cyclocardia borealis
    Taxon name last Modified on 12/12/23
    314714604001
    [45] Cyclocardia compressa
    Taxon name last Modified on 12/12/23
    314614604001
    [46] † Cyclocardia granulata
    Taxon name last Modified on 06/11/24
    214914704001
    [47] Cyclocardia moniliata
    Taxon name last Modified on 12/12/23
    215114704001
    [48] † Cyclocardia awamoensis
    Taxon name last Modified on 06/11/24
    214814704001
    [49] Crassicardia crassidens
    Taxon name last Modified on 12/12/23
    314614604001
    [50] Coanicardita ventricosa
    Taxon name last Modified on 12/12/23
    214714704001
    [51] Hippocampocardia barbarensis
    Taxon name last Modified on 12/12/23
    314514505001


    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project4
    Project downloads2
    Matrix downloads2Malarossia matrix (2 downloads);