Costellamussiopecten cristatus badense (Fontannes, 1882)
FONTANNES, F. 1879-1882. Les invertébrés du Bassin tertiaire du Sud-est de la France. Description des Mollusques pliocènes de la vallée du Rhône et du RoussilIon, T. II : Acephales. Lyon-Paris, 1879-1882. [p. 199]
1882 Pleuronectia badensis Fontannes, 1882
«This taxon belongs to a linege of amussiopectinoid shaped Costellamusium, which originated in the Oligocene, possibly from Costellamussiopecten deletus. Its oldest representative is C. passini (Meneghini). The lineage becomes extint in the Pliocene. Its last representative was the European "Amusium" - "Amusium" cristatum (Bronn.). The morphologically homologue Amusssiopecten- Amusium lineage originated likely in the Oligocene, but as mentioned above never developed the scaly ornament and the dorsal crista.
Costellamussiopecten cristatus badense is morphologicalli closely relted to its Pliocene succesor, hence some authors tend to regard them as synonymous (e.g. Studencka et al. 1998). In contrast Schultz (2001) following Kautsky (1928) consider the difference as allowing the subspecies level division. Principally Costellamussiopecten cristatus has mostly completely suppressed ribs of the left umbonal region being more dorso-ventrally elongated.» MANDIC, O. 2004. Pectinid bivalves from the Grund Formation (Lower Badenian, Middle Miocene, Alpine-Carpathian Foredeep) - Taxonomic revision and stratigraphic revision. Geologia Carphatica, 55 (2): 129-146 [p. 140]
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Costellamussiopecten cristatus badense (Fontannes); O. Mandic, 2004, Pectinid bivalves from the Grund Formationm, figures 5.5-5.7.
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