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Bivalve Taxonomic Diversity Throughout the Italian Pliocene As a Tool for Climatic-Oceanographic and Stratigraphic Inferences

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Bivalve Taxonomic Diversity Throughout the Italian Pliocene As a Tool for Climatic-Oceanographic and Stratigraphic Inferences Proceedings of the I" R.C.A.N.S. Congress, Lisboa, October 1992 pp.45-50 Ciencias da Terra (UNL) Lisboa N° 12 1993 ( 2 figs. Bivalve taxonomic diversity throughout the Italian Pliocene as a tool for climatic-oceanographic and stratigraphic inferences S. Raffi1 & P. Monegattl- 1 - Istituto di Geologia dcll'Universita di Urbino, Italia 2 - Istituto di Paleontologia dell'Universita di Parma, Italia ABSTRACT Key words: Bivalves; Diversity; Mediterranean; Pliocene. The state of research on the evolution of marine bivalve taxonomic diversity of the Mediterranean Pliocene is analysed. The following assertions are discussed: 1) The Early Pliocene malacofauna is characterized by a high number of warm-water taxa and a high taxonomic diversity with respect to that of the present time. 2) The first appreciable extinction event in the Mediterranean Pliocene approximates or just follows the FO of Globorotalia bononiensis. 3) The second appreciable extinction event is between the LAD of Discoaster tamalis and the LAD of Discoaster surculus . 4) A third minor extinction event is penecontemporaneous with the FO of Globorotalia inflaia. Taking into account the available data on the Pliocene extinction events it has been possible to distinguish 4 different molluscan units with different climatic-oceanographic significance. INTRODUCTION classification of the shallow water environment sections, where calcareous plankton is scanty and less significant. The immigration and local extinctions in the Most of the remarks on the Neogene mollusc fauna are Mediterranean throughout the Pleistocene ofalternatively still qualitative. Neverthelessduring the last 15 years a list tropical and celtic-boreal marine molluscs has been, since of the Mediterranean Pliocene bivalves has been worked De Stefani (1876), a suitable phenomenon for working out out (Marasti & Raffi, 1980); this list, although subject to an ecobiostratigraphic framework. The decrease in continuous revision, has allowed a first approach to the taxonomic diversity throughoutthe Pliocene has been well analysis of the molluscan taxonomic diversity from the known since Levi (1900); Ruggieri (1950; 1957) pointed Pliocene to the Recent (Marasti & Raffi, 1980; Raffi & out the relevance of this phenomenon, but commonopinion Marasti, 1982; Raffi et at. 1985). As a consequence in up to the 50' s was that Pliocene marine mollusc fauna was recent years it has become possible to clarify the patterns stable and represented by warm-water taxa, which of Pliocene Mediterranean extinctions (regional disappeared at the PIP boundary (Gignoux, 1954) orin the disappcarances+ true extinctions), even if many problems uppermost Piacenzian. Only since the 60's it has been are still open (Raffi & Marasti, 1982; Rafflet al., 1985, definitively acknowledged that the Pliocene was 1989). characterized by a progressive decrease in marine mollusc Monegatti, Pantoli & Raffi ( work in progress) have taxonomic diversity as a consequence of progressive revised the list of Marasti and Raffi (excluding climaticcooling (Ruggieri, 1962; 1967). Therefore, thanks Paleotaxodonta) and all the data available on the Italian to their high extinction rate (over 30%), Pliocene molluscs Pliocene distribution of bivalves. On the whole they took resulted potentially useful as a tool for climatic­ into account a stock of 348 species of infralittoral and oceanographic and chronological inferences. In particular, circalittoral environments. Thesedata show the possibility the knowledge of the stratigraphic range of the molluscs, of working out a chronological framework of the Italian calibrated by biostratigraphic and magneto-biostratigraphic Pliocene based on marine molluscs (and in particular on data could well play an important role in the stratigraphic the bivalves). 45 Ci~ncias cia Terra (UNL) , 12 THE EARLY PLIOCENE MALACOFAUNA IS mammal faunas (Torre, 1987) and in the vegetal CHARACTERIZED BY A HIGH NUMBER OF environments (Sue, 1984),corresponds to the first important WARM-WATER TAXA AND A HIGH Pliocene cooling phenomenon of our hemisphere (Raffi TAXONOMIC DIVERSITY WITH RESPECT TO and Marasti, 1982; Raffi et al. 1985). Furthermore, we THAT OF THE PRESENT TIME point out that this extinction event, marked by the disappearance in the Mediterranean of most of the tropical The malacofaunaof the LowerPliocene* of Italian authors fauna, is well correiatable with the first appearance of (Zanclean-Lower Piacenziane'Tabianian sensu Mayer, immigrants of Pacific origin and the disappearance of 1867), the top of which is calibrated at about 3-3.2 Ma, is southern boreal taxa in the classical section of Tjornes characterized by the presence of the genusStrombus (S. (Northern Iceland) (Bardarson, 1925; Strauch, 1963; coronatus Defrance) and by a relatively high specific Cronin, 1991). diversity ofwarm -water taxa, in partieular Terebridae and Conidae. The specific diversity of genus Conus s.l. in the Mediterranean Pliocene is a problem that it is still open, THE SECOND APPRECIABLE EXTINCTION nevertheless, it is not lower than 20-30 species; at the EVENT IS BETWEEN THE LAD OFDISCOASTER present time only one species (Conus ventricosusOmelin) TAMALIS AND THE LAD OFD. SURCULUS is with certainty an inhabitant of the Mediterranean. The Pliocene survivors of this genus arc now spread along the It has already been noted that some molluscs of warm­ western coast of Africa, south of Rio de Oro. Terebridae water affinity thrived in the Mediterranean up to a time not are represented by about ten species, 6 of them live today defined between the LAD oW. tamalis and the LAD ofD. along the coasts of western Africa south of Cape Barbas surculus (Raffi et aI., 1989b), which are calibrated (Riode Oro) (Bouchet, 1982). Among the Pliocene bivalves respectively at about 2.6 and 2.4 m.y.a. (Rioetal., 1990). at least 10 survivors are today exclusivcof the tropical west Terebridae, which were still represented by at least 5 Africa (inner tropical in the meaning of Hall, 1964) and species, disappeared definitively and the specific diversity they will probably increase in number thanks to the of Conus decreased from 10-15 species to 1-3 species progress of the malacological research in tropical west (only Conus striatulus Brocchi and Conus ventricosus Africa. Gmelin arc cited with certainty after this extinction event). Within thebivalvesonly 11species "probably"disappear THE FIRST APPRECIABLE EXTINCTION at this time [e.g, Dymiajragilis(Kocnen), Neopycnodonte EVENT IN THE MEDITERRANEAN PLIOCENE navicularis, Korobkovia oblonga, etc.]. Taking into account APPROXIMATES OR JUST FOLLOWS THE FO all the doubtful cases, this number could well increase OF GLOBOROTALIA BONONIENSIS, remarkably ( up to about 40). In any case the extinction CALIBRATED AT ABOUT 3-3.2 MA percentage at 2.4 Ma is with certainty much lower than at 3 m.y.a. (Fig. I). Marasti &Raffi (1976, 1977), Raffi & Marasti (1982) have This extinction episode appears well correlatable with provided evidence of this first extinction phase in the the first major northern hemisphere glacial event, that is, Mediterranean Pliocene. Within thebivalves the pcrcentage with the beginning of the glacial Pliocene (Shacklctonet of extinction isbetween 15and23%; so at least53 species al., 1984). and no more than 80 species out of 348 disappeared from the Mediterranean (Fig. I) in correspondence to or just A THIRD MINOR EXTINCTION EVENT IS after the FO of Globorotalia bononiensis and G. PENECONTEMPORANEOUS WITH THE FO OF crassajormis (Monegatti, Pantoli & Raffi, in progress). GLOBOROTALIA INFLATA The taxonomic diversity of Terebridae and Conidae decreased severely but these two taxa were still well Only three species [Pecten flabelliformis (Brocchi), represented in the Mediterranean after this extinction Chlamys scabrella(Lamarck) and Pelecyora islandicoides event. In particular at least five species of Terebridae were (Lamarck)] arc known to disappear approximately in cor­ still living in the Mediterranean: lIastula jarinesi respondence with the FO of G. inflata, which has been (Fontannes), Subula fuscata (Brocchi), Strioterebrum calibrated at about 2.1-2 Ma; nevertheless this extinction reticulare (Pecchioli), Strioterebrum pliocenicum event iseasily recognizable and useful for biostratigraphic (Fontannes), Terebra acuminata (Borson). In the present­ purposes because these species were very common up to day these species are spread along the western coast of the FO of G. inflata (Fig. 1). Africa south of Cape Barbas. Itis at this time thatStrombus Few species (e.g. Venus libel/us, Laevicardium coronatusdisappeared definitively in the Italian Pliocene. subturgidum millasiense, etc.) disappeared in the Po Basin It is already well known that this extinction event, which just before the first appearance' of the boreal guests; this is well correlatable with the changes recorded in the datum needs nevertheless to be reconfirmed in other basins. *-The Lower Pliocene Mediterranean malacofauna consists of a prevailing stock of species already present in the Early Messinian and a new stock of species never cited with certainty in the Mediterranean Miocene; within bivalves the "new stock" (excluding Paleotaxodonta) is represented by 30% of the whole Pliocene fauna (Marasti & Raffi, 1980). 46 Proceedings oCtile 1" R.C.A.N.S. Congress, Lisboa, October 1992 350 348 300 so 295 L1J (84,8%) () L1J 0.. Cf) 268 1S (77%) 0 Z 250 254 247 200 A 199 (57,2 %) M.A. 5,0 4,5 4,0 3,5 3,0 2,5 2,0 1,5 1,0 0,5 0 G. bononiensis G. inflata ~ r--c,. oceanica r --{ 0.
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