Abstract
Akardita n. gen. is described for a small Pliocene to Recent group of carditids. The type species is Cardita subrevoluta de Stefani, 1888, from the lower Pliocene of Italy. The new genus includes Akardita iberica n. sp., from the lower Pliocene of southern Spain, and Cardita (Venericardia) monodi Nicklès, 1953, an extant species from West Africa. A few additional Neogene species from Europe could turn out to be representatives of the new genus, whose disappearance from European seas seems to be related to an increasing cooling trend during the Neogene–Pleistocene interval. Because of the confused status of carditid taxonomy, about which some observations are reported in the present work, it is not possible to assign the new genus to any of the traditional subfamilies.
References
Andrés, I. (1987) Los Heterodonta (Bivalvia) en el Plioceno marino de Bonares (Huelva). Studia Geologica Salmanticense, 24, 83–149.
Ardovini, R. & Cossignani, T. (2004) West African seashells (including Azores, Madeira and Canary Is.). Conchiglie dell'Africa Occidentale (incluse Azzorre, Madeira e Canarie). L'Informatore Piceno, Ancona, 319 pp.
Bernard, P.A. (1984) Coquillage du Gabon. Shells of Gabon. Libreville, Gabon, 140 pp.
Bieler, R., Carter, J.G. & Coan, E.V. (2010) Classification of Bivalve Families. In: Bouchet, P. & Rocroi, J.-P. (Eds.), Nomenclator of Bivalve Families. Malacologia, 52, pp. 113–133.
Bogi, C. & Chirli, C. (2004) Studi sul Pliocene toscano. Poggio alla Fame presso Colle di Val d’Elsa (SI). Bollettino Malacologico, 40, 88–93.
Bossio, A., Mazzei, R., Salvatorini, G. & Sandrelli, F. (2002) Geologia dell’area compresa tra Siena e Poggibonsi (“Bacino del Casino”). Atti della Società Toscana di Scienze Naturali, Memorie, Serie A, 2000–2002, 69–85.
Bouchet, P. (2011) Cyclocardia Conrad, 1867. In: MolluscaBase (2017). Accessed through: World Register of Marine Species. Available from: http://www.marinespecies.org/aphia.php?p=taxdetails&id=156830 (accessed 9 May 2017)
Brocchi, G. (1814) Conchiologia fossile subappennina con osservazioni geologiche sugli Appennini e sul suolo adiacente. Vol. 1 & 2. Stamperia Reale, Milano, 472 pp.
https://doi.org/10.5962/bhl.title.11569Brunetti, M.M. (2014) Conchiglie fossili di Monte Antico. Tipolito Duemila Group, Campi Bisenzio, 118 pp.
Carter, R.M. (1967) On the nature and definition of the lunule, escutcheon and corcelet in the Bivalvia. Proceedings of the Malacological Society of London, 37, 243–263.
Carter, J.G., Harries, P.J., Malchus, N., Sartori, A.F., Anderson, L.C., Bieler, R., Bogan, A.E., Coan, E.V., Cope, J.C.W., Cragg, S.M., Garcia-March, J.R., Hylleberg, J., Kelley, P., Kleeman, K., Kříž, J., McRoberts, C., Mikkelsen, P.M., Pojeta, J. Jr., Tëmkin, I., Yancey, T. & Zieritz, A. (2012) Illustrated glossary of the Bivalvia. Part N. Revised. Vol. 1. Ch. 31. Treatise Online, 48, 1–209.
Caze, B., Saint Martin, J.-P., Merle, D. & Saint Martin, S. (2010) Intérêt des motifs colorés résiduels des coquilles de mollusques pour la valorisation des sites paléontologiques et des collections: l'exemple du Badénien de Roumanie. In: Saint Martin, J.-P., Saint Martin S., Oaie G. & Seghedi, A. (Eds.), Le patrimoine paléontologique, Des trésors du fond des temps. GeoEcoMar, Bucarest, pp. 27–38.
Cerulli Irelli, S. (1907) Fauna malacologica mariana. Parte 1. Palaeontographia Italica, 13, 65–139.
Chavan, A. (1969) Superfamily Carditacea Fleming, 1820. In: Moore, R.C. (Ed.), Treatise on Invertebrate Paleontology. Part N. Vol. 2. Mollusca 6. Bivalvia. Geological Society of America & University of Kansas Press, Lawrence, pp. 543–561.
Chirli, C. & Bogi, C. (2002) La malacofauna pliocenica di Poggio alla Fame presso Colle Val d’Elsa (Siena). Contributo 1. La Conchiglia, 303, 18–22.
Civis, J., Sierro, F.J., González Delgado, J.A., Flores, J.A., Andrés, I., Porta, J. de & Valle, M.F. (1987) El Neógeno marino de la provincia de Huelva: Antecedentes y definición de las unidades litoestratigráficas. In: Civis, J. (Ed.), Paleontología del Neógeno de Huelva (W Cuenca del Guadalquivir). Universidad de Salamanca, Salamanca, pp. 9–23.
Coan, E.V. (1977) Preliminary review of the northwest American Carditidae. The Veliger, 19, 375–386.
Coan, E.V. & Valentich-Scott, P. (2012) Bivalve seashells of tropical West America. Marine bivalve mollusks from Baja California to northern Peru. Santa Barbara Museum of Natural History Monographs, 6, Studies in Biodiversity, 4, 1–1258.
Cosel, R. von (1995) Fifty-one new species of marine bivalves from tropical West Africa. Iberus, 13, 1–115.
Cossignani, T. & Ardovini, R. (2011) Malacologia mediterranea. Atlante delle conchiglie del Mediterraneo. L'Informatore Piceno, Ancona, 536 pp.
Cossmann, M. & Peyrot, A. (1912) Conchologie néogènique de l’Aquitaine. Actes de la Société Linnéenne de Bordeaux, 66, 169–232.
Dall, W.H. (1902) Synopsis of the Carditacea and of the American species. Proceedings of the Academy of Natural Sciences of Philadelphia, 54, 696–716.
Dautzenberg, P. (1912) Mission GRUVEL sur la côte occidentale d'Afrique (1909–1910). Mollusques marins. Annales de l'Institut océanographique, 5, 1–111.
de Stefani, C. (1888) Iconografia dei nuovi molluschi pliocenici d'intorno Siena. Bullettino della Società Malacologica Italiana, 13, 209–235.
de Stefani, C. & Pantanelli, D. (1878) Molluschi pliocenici dei dintorni di Siena. Bullettino della Società Malacologica Italiana, 4, 1–215.
Dollfus, G.S. & Cotter, J.C.B. (1909) Mollusques tertiaires du Portugal. Le Pliocéne au nord du Tage (Plaisancien). 1. Pelecypoda. Prècèdeèd’une notice géologique. Imprimerie Nationale, Lisbonne, 103 pp.
Fischer, P. (1877a) Diagnoses molluscorum in stratis fossiliferis insulae Rhodi jacentium. Journal de Conchyliologie, 17, 78–81.
Fischer, P. (1877b) Paléontologie des terrains tertiaires de l'île de Rhodes. Mémoires de la Société Géologique de France, 3, 1–46.
Fontannes, F. (1882) Les mollusques pliocènes de la Vallée du Rhône et du Roussillon. Vol. 2. Acéphales. Georg, Lyon, 320 pp.
Forli, M., Dell'Angelo, B. & Taviani, M. (1998) Molluschi del Pliocene inferiore toscano: la sezione di Montenero (Grosseto). Bollettino Malacologico, 34, 109–122.
Freneix, S. (1972) Les Mollusques bivalves crétacés du Bassin côtier de Tarfaya (Maroc méridional). Notes et Mémoires du Service géologique du Maroc, 228, 49–255.
Gignoux, M. (1913) Les formations marines pliocènes et quaternaires de l’Italie du Sud et de la Sicile. Annales de l’Université Précédée d’une de Lyon, New Series, 1 (36), 1–393.
Gofas, S. (2011) Familia Carditidae. In: Gofas, S. Moreno, D. & Salas C. (Coords), Moluscos marinos de Andalucía. Servicio de Publicaciones e Intercambio Cientifico, Universidad de Málaga, Málaga, Andalusia, pp.594–595.
Gofas, S. & Rosenberg, G. (2017) Cyclocardia monodi. In: MolluscaBase (2017). Accessed through: World Register of Marine Species. Available from: http://www.marinespecies.org/aphia.php?p=taxdetails&id=225368 (accessed 6 July 2017)
González Delgado, J.A. (1988) Estudio sistemático de los gasterópodos del Plioceno de Huelva (SW de España). III. Mesogastropoda (Scalacea–Tonnacea). Studia Geologica Salmanticensia, 25, 109–160.
González Delgado, J.A., Andrés, I, Sierro, F.J., Valle M.F. & Flores, J.A. (2010) Catálogo Malacológico (Gastropoda y Bivalvia) del Plioceno de Huelva: Relación del material depositado y catalogados en el Departamento de Paleontología de la Universidad de Salamanca. Parte 1. Studia Geologica Salmanticensia, 19, 1–30.
González, V.L. & Giribet, G. (2012) A new cryptic species of carditid bivalve from the Gulf of California (Mollusca, Bivalvia, Archiheterodonta, Carditidae). Malacologia, 55, 235–250.
https://doi.org/10.4002/040.055.0205González, V.L. & Giribet, G. (2015) A multilocus phylogeny of archiheterodont bivalves (Mollusca, Bivalvia, Archiheterodonta). Zoologica Scripta, 44, 41–58.
https://doi.org/10.1111/zsc.12086Güller, M. & Zelaya, D. (2013) The Families Carditidae and Condylocardiidae in the Magellan and Perú–Chile provinces (Bivalvia: Carditoidea). Zootaxa, 3682, 201–239.
https://doi.org/10.11646/zootaxa.3682.2.1Hammer, Ø., Harper, D.A.T. & Ryan, P.D. (2001) PAST: Paleontological statistics software package for education and data analysis. Palaeontologia Electronica, 4 (1), 1–9. Available from: http://palaeo-electronica.org/2001_1/past/issue1_01.htm (accessed 17 January 2018)
Head, M.J. & Gibbard, P.L. (2005) Early Middle Pleistocene transitions: an overview and recommendation for the defining boundary. In: Head, M.J. & Gibbard, P.L. (Eds.), Early Middle Pleistocene Transitions: The Land Ocean Evidence. Geological Society, London, Special Publication, 247, pp. 1–18.
https://doi.org/10.1144/GSL.SP.2005.247.01.01Heaslip, W.G. (1968) Cenozoic evolution of the alticostate venericards in Gulf and East Coastal North America. Palaeontographic Americana, 6, 55–135.
Heinberg, C. (1993) Birkelundita, a new genus (Bivalvia, Carditacea) from the Upper Cretaceous of Europe. Bulletin of the Geological Society of Denmark, 40, 185–191.
Huber, M. (2010) Compendium of bivalves. ConchBooks, Hackenheim, 901 pp.
Janssen, A.W. & Van der Slik, L. (1972) De fossiele schelpen van de Nederlandse stranden en zeegaten. Tweede Serie 5. Basteria, 36, 171–180.
Janssen, A.W. & Moerdijk, P.W. (2004) Revision of Pliocene representatives of Cyclocardia (Bivalvia, Carditidae) from the North Sea Basin. Basteria, 68, 77–85.
Jones, G.F. & Thompson, B.E. (1987) The ecology of Cyclocardia ventricosa (Gould, 1850) on the southern California borderland. The Veliger, 29, 374–383.
Lamy, E. (1922) Révision des Carditacea vivants du Museum d’Histoire Naturelle de Paris. Journal de Conchyliologie, 66, 218–276, 289–368.
Landau, B.M. (2011) A discussion of the molluscan fauna of two Pliocene localities in the province of Huelva (Spain), including description of six new specie. Tertiary Researches, 6, 135–155.
Landau, B.M., da Silva, C.M. & Mayoral, E. (2011) The Lower Pliocene gastropods of the Huelva Sands Formation, Guadalquivir Basin, Southwestern Spain. Palaeofocus, 4, 1–155.
La Perna, R. (2016) Bucardium grateloupianum n. sp. from the Lower Miocene of Aquitaine with taxonomic comments on some fossil species from Europe (Bivalvia, Cardiidae). Zootaxa, 4178 (4), 568–582.
https://doi.org/10.11646/zootaxa.4178.4.7La Perna, R. (2017) A revision of the genus Europicardium Popov, 1977 (Bivalvia: Cardiidae) from the European Neogene: tracking palaeogeography and climate changes. Journal of Systematic Palaeontology, 15, 287–312.
https://doi.org/10.1080/14772019.2016.1170733La Perna, R., Mandic, O. & Harzhauser, M. (2017) Systematics and palaeobiogeography of Megacardita Sacco in the Neogene of Europe (Bivalvia, Carditidae). Papers in Palaeontology, 3, 111–150.
https://doi.org/10.1002/spp2.1072Marquet, R. (2005) The Neogene Bivalvia (Heterodonta and Anomalodesmata) and Scaphopoda from Kallo and Doel (Oost-Vlaanderen, Belgium). Palaeontos, 6, 1–142.
Mayer, K. (1871) Découverte des couches à Congéries dans le bassin du Rhône. Vierteljahresschrift der Naturforschenden Gesellschaft in Zürich, 16, 185–203.
McClure, K.J. & Lockwood, R. (2015) Relationships among Venericardia (Bivalvia: Carditidae) on the U.S. Coastal Plain during the Paleogene. Journal of Paleontology, 89, 522–531.
https://doi.org/10.1017/jpa.2015.23Monegatti, P. & Raffi, S. (2001) Taxonomic diversity and stratigraphic distribution of Mediterranean Pliocene bivalves. Palaeogeography, Palaeoclimatology, Palaeoecology, 165, 171–193.
https://doi.org/10.1016/S0031-0182(00)00159-0Nicklès, M. (1950) Mollusques testacés marins de la côte occidentale d'Afrique. Manuels Ouest-Africains. Vol. 2. Le Chevalier, Paris, 269 pp.
Nicklès, M. (1953) Quelques lamellibranches du littoral Ouest-Africain. Institut royal des Sciences naturelles de Belgique Bulletin, 29, 1–11.
Oberling, J.J. (1964) Observations on some structural features of the pelecypod shell. Mittheilungen der Naturforschenden Gesellschaft in Bern, New Series, 20, 1–63.
Pacaud, J.-M. & Merle, D. (2016) Note taxonomique sur des Carditidae (Bivalvia: Carditoida) du Maastrichtien et du Danien du bassin de Paris introduits par Alcide d’Orbigny en 1850. Xenophora Taxonomy, 11, 43–49.
Pantanelli, D. (1893) Lamellibranchi pliocenici. Enumerazione e sinonimia delle specie dell’Italia superiore e centrale. Bullettino della Società Malcologica Italiana, 17, 129–294.
Pasteur-Humbert, C. (1962) Les mollusques marins testacés du Maroc. Catalogue non critique. II : Lamellibranches et Scaphopodes. Travaux de l'Institut scientifique chérifien, Série Zoologie, 28, 1–184.
Pérez, D.E., Alvarez, M.J. & Santelli, M.B. (2016) Reassessment of Neovenericor Rossi de García, Levy & Franchi, 1980 (Bivalvia: Carditidae) using a geometric morphometric approach, and revision of planicostate carditids from Argentina. Alcheringa, 41 (1), 112–123.
https://doi.org/10.1080/03115518.2016.1196436Pérez, D.E. & Del Rio, C.J. (2017) Systematics of the family Carditidae (Bivalvia: Archiheterodonta) in the Cenozoic of Argentina. Zootaxa, 4338 (1), 51–84.
https://doi.org/10.11646/zootaxa.4338.1.3Poorten, J.J. ter & La Perna, R. (2017) The West African enigma: systematics, evolution, and palaeobiogeography of cardiid bivalve Procardium. Acta Palaeontologica Polonica, 62, 729–757.
https://doi.org/10.4202/app.00363.2017Popov, S.V. (1983) Late Cenozoic and modern bivalve molluscs of the family Carditidae from USSR. Akademiya Nauk SSSR, Trudy Paleontologicheskogo Instituta, 203, 1–119. [in Russian]
Riforgiato, F., Foresi, L.M., Mazzei, R. Salvatorini, G. & Sandrelli, F. (2005) Chronostratigraphic revision of some Pliocene basins in Tuscany at the Zanclean/Piacenzian boundary. Bollettino della Società Geologica Italiana, Special Volume, 3, 7–13.
Rossi Ronchetti, C. (1952) I tipi della “Conchiologia Fossile Subappennina” di Brocchi. Rivista Italiana di Paleontologia e Stratigrafia, Memorie, 5, 1–89.
Sabelli, B., Giannuzzi Savelli, R. & Bedulli, D. (1990) Catalogo annotato dei molluschi marini del Mediterraneo. Annotated check-list of Mediterranean marine mollusks. Vol 1. Libreria Naturalistica Bolognese, Bologna, 348 pp.
Sacco, F. (1899) I molluschi dei terreni terziari del Piemonte e della Liguria, parte 27. Unionidae, Carditidae, Astartidae, Crassatellidae, Lasaeidae, Galeommatidae, Cardiidae, Limnocardiidae. Carlo Clausen, Torino, 98 pp.
Schultz, O. (2003) Bivalvia neogenica (Lucinoidea–Mactroidea). In: Piller, W.E. (Ed.), Catalogus fossilium Austriae. Vol. 1. Part 2. Verlag der Österreichischen Akademie der Wissenschaften, Wien, pp. 381–690.
Seguenza, G. (1877) Studi stratigrafici sulla formazione pliocenica dell’Italia meridionale. Bullettino del Reale Comitato Geologico d’Italia, 8, 7–17.
Seguenza, G. (1879) Le formazioni Terziarie nella Provincia di Reggio (Calabria). Memorie della Reale Accademia dei Lincei, Classe di Scienze Fisiche Matematiche e Naturali, 6, 1–446.
Sieber, R. (1956) Die mittelmiozänen Carditidae und Cardiidae des Wiener Beckens. Mitteilungen der Geologischen Gesellschaft in Wien, 47, 183–234.
Snyder, C.W. (2016) Evolution of global temperature over the past two million years. Nature, 538, 226–228.
https://doi.org/10.1038/nature19798Stanley, S.M. (1970) Relation of shell form to life habits of the Bivalvia (Mollusca). Geological Society of America, Memoirs, 125, 1–296.
https://doi.org/10.1130/MEM125-p1Stanley, S.M. (1972) Functional morphology and evolution of byssally attached bivalve molluscs. Journal of Paleontology, 46, 165–212.
Taylor, J.D., Williams, S.T., Glover, E.A. & Dyal, P. (2007) A molecular phylogeny of heterodont bivalves (Mollusca: Bivalvia: Heterodonta): new analyses of 18S and 28S rRNA genes. Zoologica Scripta, 36, 587–606.
https://doi.org/10.1111/j.1463-6409.2007.00299.xVermeij, G.J. (2005) From Europe to America: Pliocene to Recent trans-Atlantic expansion of cold-water North Atlantic molluscs. Proceedings of the Royal Society B, 272, 2545–2550.
https://doi.org/10.1098/rspb.2005.3177Vermeij, G.J. (2012) The tropical history and future of the Mediterranean biota and the West African enigma. Journal of Biogeography, 39, 31–41.
https://doi.org/10.1111/j.1365-2699.2011.02601.xVokes, H.E. (1980) Genera of the Bivalvia: a systematic and bibliographic catalogue (revised and updated). Paleontological Research Institution, Ithaca, 307 pp.
Yonge, C.M. (1969) Functional morphology and evolution within the Carditacea (Bivalvia). Proceedings of the Malacological Society, London, 38, 493–527.