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Middle Triassic; Meride, Canton Ticino, Switzerland) Bollettino della Società Paleontologica Italiana, 51 (3), 2012, 203-212. Modena, 30 dicembre 2012 A new species of Sangiorgioichthys (Actinopterygii, Semionotiformes) from the Kalkschieferzone of Monte San Giorgio (Middle Triassic; Meride, Canton Ticino, Switzerland) Cristina LOMBARDO, Andrea TINTORI & Daniele TONA C. Lombardo, Dipartimento di Scienze della Terra “Ardito Desio”, Via Mangiagalli 34, I-20133 Milano, Italy; [email protected] A. Tintori, Dipartimento di Scienze della Terra “Ardito Desio”, Via Mangiagalli 34, I-20133 Milano, Italy; [email protected] D. Tona, Corso Rigola 64, I-13100 Vercelli, Italy; [email protected] KEY WORDS - Actinopterygii, Early Semionotidae, new taxon, Ladinian, Monte San Giorgio. ABSTRACT - The genus Sangiorgioichthys is one of the few Semionotidae known from the Middle Triassic. The type species S. aldae Tintori & Lombardo, 2007 has been found in Late Ladinian marine deposits of both the Italian and Swiss sides of Monte San Giorgio. A second species, S. sui López-Arbarello et al., 2011 described from the Pelsonian (Middle Anisian) of Luoping (Yunnan, South China) has extended the range of the genus both in time and space. A further species of Sangiorgioichthys, Sangiorgioichthys valmarensis n. sp., is described herein from the Late Ladinian Kalkschieferzone (Meride Limestone) of the Monte San Giorgio area, the same unit yielding the type species. Sangiorgioichthys valmarensis n. sp. differs from the already known species in number and arrangement of suborbitals, shape of the teeth and in shape and row number of the scales. The new species of Sangiorgioichthys increases the diversity of Semionotidae already in the Middle Triassic, indicating that the explosive radiation of Semionotidae during the Norian was preceded by a first phase of diversification during the Middle Triassic. RIASSUNTO - [Una nuova specie di Sangiorgioichthys (Actinopterygii, Semionotiformes) dalla Kalkschieferzone del Monte San Giorgio (Triassico Medio; Meride, Canton Ticino, Svizzera)] - Il genere Sangiorgioichthys è uno dei pochi Semionotidae noti dal Triassico Medio. La specie tipo S. aldae Tintori & Lombardo, 2007 è stata rinvenuta in depositi del Ladinico Superiore sia sul versante italiano che su quello svizzero del Monte San Giorgio. Una seconda specie, S. sui López-Arbarello et al., 2011, del Pelsonico (Anisico Medio) di Luoping (Yunnan, Cina meridionale) ha esteso la distribuzione del genere nello spazio e nel tempo. In questo lavoro viene descritta Sangiorgioichthys valmarensis, una nuova specie di Sangiorgioichthys rinvenuta nella stessa unità da cui proviene la specie tipo (Kalkschieferzone, Calcare di Meride) del Ladinico Superiore dell’area del Monte San Giorgio. Il nuovo taxon differisce dalle specie già note per la forma e la disposizione dei suborbitali, la forma dei denti e per numero di file e forma delle scaglie. La nuova specie di Sangiorgioichthys mostra come i Semionotidae fossero già diffusi e diversificati durante il Triassico Medio, indicando come la loro radiazione esplosiva durante il Norico (Triassico Superiore) sia stata in realtà preceduta da una prima fase di diversificazione durante il Triassico Medio. INTRODUCTION subdivided in at least two different assemblages (Tintori, 1990; Lombardo, 1999, 2001, 2002; Tintori & Lombardo, The Monte San Giorgio area (Fig. 1) is one of the 1999, 2007; Lombardo & Tintori, 2004), the nothosaurid historically most important areas for marine vertebrates Lariosaurus (Tintori & Renesto, 1990; Renesto et al., of the Middle Triassic. More than 150 years of scientific 2003), three crustaceans (the mysidiacean Schimperella, excavations in a sequence of several fossiliferous levels the conchostracan Laxitextella and very rare undescribed concentrated in a few square kilometres, led this site decapods), a few insects mostly still undescribed to be totally (Italian and Swiss sides) included in the (Krzeminski & Lombardo, 2001; Bechly & Stockar, 2011) UNESCO World Heritage List in 2010 for its unique and a few terrestrial plant remains. If we compare the outstanding palaeontological significance regarding fossil assemblages in the KSZ with those from the lower the evolution of marine vertebrates during the Middle Meride Limestone Cava Inferiore, Cava Superiore and Triassic. The best known fossiliferous unit is the Besano Cassina, we do not see many differences in the number Formation of latest Anisian - earliest Ladinian age, but of vertebrate and invertebrate taxa found in each single since 25 years our research group is working on the poorly level (Bürgin, 1998, 1999); on the contrary, the Besano investigated uppermost part of Meride Limestone, the Formation assemblages are made of many more taxa, both Kalkschieferzone (KSZ), of probable latest Ladinian age vertebrates and invertebrates (Lombardo, 1999; Röhl et (see Stockar et al., 2012). al., 2001) pointing to a strictly marine environment. During about 25 years of excavations lead by two of the authors (AT and CL), a number of interesting fossils has been reported from the lower/middle part of TAPHONOMY AND PALAEOENVIRONMENT OF the upper member of the Meride Limestone, from both THE KALKSCHIEFERZONE the Italian and Swiss sides of the Monte San Giorgio palaeontological area. However, the general biodiversity In the KSZ no sure marine stenohaline organism has of the KSZ is quite low: about 20 fish species actually been found, leaving apart the nothosaurid Lariosaurus ISSN 0375-7633 doi:10.4435/BSPI.2012.23 204 Bollettino della Società Paleontologica Italiana, 51 (3), 2012 p. 27), can be considered as a mass mortality one: a flood brought the insects and the plant remains in the basin and also killed the small fishes, which were used to dwell in marine salt waters. The presence of five fish specimens plus three insects are really worth of a ‘mass mortality event’ interpretation, for such a restricted excavation surface: the number of fish specimens per square meter is actually very low in these levels, with the exception of surfaces with up to 50 Prohalecites specimens per square meter. The average ‘richness’ in a fossiliferous level, following many years of field works in the KSZ, could be considered as one specimen every several dozens square meters for each lamina surface. Actually, Bechly & Stockar (2011) did not find any other fossil in the two meters thick sequence yielding Dasyleptus and the small fishes, proving that the fossiliferous surface in the whole is strictly related to the flooding. Fig. 1 - The Monte San Giorgio area. The stout black line indicates The lower and middle KSZ provide a very high the Besano Formation outcrops with small faults displacing number of specimens on mass mortality surfaces, the unit. The Meride Limestone outcrops South to the Besano compared to the regular (attritional) mortality ones. Fig. Formation. Stars indicate the position of the two major sites for the 2 shows the distribution of specimens in different beds Kalkschieferzone. After Lombardo (2002), modified. of the site Meride-Val Mara D (lower part). The genus Peltopleurus is particularly interesting in its distribution as it amounts to 273 specimens on a total of 471 fishes and the fishes, most of them strictly related to the marine recovered during the 1997-2001 excavations, for a bed environment: in fact, many of the KSZ fish genera have surface of about 15 square meters (Fig. 2a). Four single been found also in other localities that can be considered surfaces can be considered as result of a mass mortality surely marine, such as Luoping, in southern China event, with 20 (Bed 15) to 151 specimens (Bed 1) each. (Lombardo et al., 2011; Lopez-Arbarello et al., 2011) or All the remaining layers yield Peltopleurus too, but the Perledo along the eastern coast of the Lario Lake (Tintori number of specimens ranges from one to six for each & Lombardo, 1999; Lombardo et al., 2008) or even the one, widespread throughout the whole laminated bed. Besano Formation in the same Monte San Giorgio area Not considering the genus Peltopleurus (Fig. 2b), mass (Bürgin, 1999). mortality events are the only explanation for the unusual During the deposition of the Meride Limestone, the record of Coelatichthys meridensis Lombardo, 2001 (32 fresh water influence became stronger: conchostracans and specimens in Bed 7) and Prohalecites porroi (Bellotti, insects point to a quite close land with superficial fresh- 1857) (24, 26 and 30 specimens respectively in Bed a, 1, water ponds, permanent or seasonal, as suggested by the 3; the species is unknown in older beds). Owing to these number of conchostracan-rich surfaces. Tintori (1990a) quite common mass mortality surfaces P. porroi is by far and Tintori & Brambilla (1991) proposed an alternation the most common species across the whole KSZ: in the of dry and very rainy seasons, a monsoonal-like climate middle part of the unit (Ca’ del Frate site, Tintori, 1990), where heavy rains could suddenly affect the KSZ basin Prohalecites constitutes about the 95% of the collected causing mass mortality events in the marine fauna, mainly specimens, but also in the upper part (Val Mara site D) it fishes, as happened at least forProhalecites , Peltopleurus makes at least the 90% of the fish specimens (data based and Allolepidotus, but also for the crustacean Schimperella on 2003 excavation by CL and AT). Thus, it is evident that (Tintori, 1990b). Furrer (1995) proposed that the fish we can consider a mass mortality surface in the KSZ when mass mortalities were related to the dry season increase we have only one specimen per square meter of a single of salinity: this appears quite unlikely as a slow increase surface, especially if they all belong to a single genus of salinity should allow fishes to leave the basin itself, (Prohalecites, Peltopleurus, Coelatichthys) or to two while a strong sudden fresh water input can suddenly genera. For the latter case, we know only mass mortality change the salinity. Also, increasing temperature should surfaces yielding Prohalecites and Peltopleurus together, affect benthic organisms rather than nektonic ones (see in Bed 1 and 2 in Val Mara- Meride site D (lower part) and for instance Cebrian et al., 2011).
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