Rivista Italiana di Paleontologia e Stratigrafia volume 114 no. 2 6 pls. pp. 233-262 July 2008 OSTRACODS ACROSS THE PERMIAN-TRIASSIC BOUNDARY IN WESTERN TETHYS: THE BULLA PARASTRATOTYPE (SOUTHERN ALPS, ITALY) SYLVIE CRASQUIN 1, M. CRISTINA PERRI 2, ALDA NICORA 3 & PATRICK DE WEVER 4 Received: February 27, 2008; accepted: May 26, 2008 Key words: Ostracods, Permian-Triassic boundary, Bulla sec- tion, Italy. Abstract. Investigation of the ostracod fauna of the parastratotype of the Permian-Triassic boundary at Bulla in the Southern Alps produced 62 species belonging to 31 genera. They are all discussed and figured. This paper presents results of the first description of ostracods from this important site. One genus, Bairdiacratia n. gen., and 13 species are new: Glyptopleurina pasinii n. sp., Knoxiella ventrospinosa n. sp., Knightina bullaensis n. sp., Bairdia ortiseiensis n. sp., B. cheni n. sp., B. (Rectobairdia) kershawi n. sp., Bairdiacratia qinglai n. gen. n. sp., B. tergilata n. gen. n. sp., Microcheilinella lata n. sp., Parabythocythere chongpani n. sp., Cavellina bellerophonella n. sp., C. alpina n. sp. and C. triassica n. sp. The palaeocecological analysis of each unit is produced. The unconformity-paraconformity U1 is clearly reflected in the ostracod assemblages and is marked by a drop in diversity and abundance of specimens. It was followed by a change in the ostracod faunal composition. The Bulla Member displays maximum ostracod diversity and abundance linked with the trangressive trend reported for this period. The unconformity-paraconformity U2, at the boundary between the Bellerophon and Werfen formations (Bulla and Lower Tesero members) is the main extinction level for ostracods. The Lower Tesero, Lower Mazzin and Upper Tesero members have very poor faunas. The lower part of the Upper Mazzin Mb. is characterized by an uneven burst of diversity before the great period of taxonomic paucity observed during the late Griesbachian all over the world. Riassunto. Per mezzo dell'analisi delle faune ad ostracodi del parastratotipo del limite Permiano-Triassico a Bulla (BZ) nelle Alpi Meridionali, sono state identificate 62 specie appartenenti a 31 generi. La loro discussione e documentazione iconografica eÁ argomento di questo lavoro. Vengono descritti un nuovo genere, Bairdiacratia n. gen., e 13 nuove specie: Glyptopleurina pasinii n. sp., Knoxiella ventrospinosa n. sp., Knightina bullaensis n. sp., Bairdia ortiseiensis n. sp., B. cheni n. sp., B. (Rectobairdia) kershawi n. sp., Bairdiacratia qinglai n. gen. n. sp., B. 1 2 3 4 tergilata n. gen. n. sp., Microcheilinella lata n. sp., Parabythocythere chongpani n. sp., Cavellina bellerophonella n. sp., C. alpina n. sp. and C. triassica n. sp. Per ciascuna unitaÁ litostratigrafica viene riportata l'a- nalisi paleoecologica. Le associazioni ad ostracodi riflettono in modo evidente la superficie di discontinuitaÁ U1 (unconformity-paraconformity 1) che separa l'UnitaÁ ad ostracodi (Ostracod and peritidal dolomite unit) e il Membro di Bulla (Bulla Mbr) della Formazione a Bellerophon, con un calo drastico in diversitaÁ e abbondanza. La maggiore diversitaÁ e abbondanza delle faune ad ostracodi eÁ associata alla fase trasgressiva del Membro di Bulla. Il principale evento di estinzione ad ostracodi coincide con la superficie di discontinuitaÁ U2 (unconformity-paraconformity 2) posta in corrispondenza del limite formazionale fra la Formazione a Bellerophon e la Formazione di Werfen, fra i membri di Bulla e del Tesero Inferiore. I membri del Tesero Inferiore, Mazzin Inferiore e Tesero Superiore presentano una fauna ad ostracodi veramente povera. La parte inferiore del Membro del Mazzin Superiore eÁ caratterizzata da un irregolare incremento di diversitaÁ che precede il periodo di scarsezza tassonomica osservato a livello mondiale durante il tardo Griesbachiano. Introduction The Bulla section in the Southern Alps is the parastratotype section for the Permian-Triassic (P-T) boundary. It was located at that time in western Tethys whereas the P-T stratotype at Meishan in China was located near the eastern border of Tethys. The Bulla section, well-known from many investigations, has been described in detail by Perri (1991), Farabegoli & Perri (1998), Perri & Farabegoli (2003) and Farabegoli et al. (2007 and references therein). Apart from a preliminary note (Pasini 1981) on ostracods from the upper part of the Bellerophon Formation at Digonera and Rio Bar- CNRS, UMR 5143, Universite Pierre et Marie Curie, Laboratoire de MicropaleÂontologie, T.46-56, E.5, case 104, 75252 Paris cedex 05, France. E-mail: sylvie.crasquin@upmc.fr UniversitaÁ degli Studi di Bologna, Dip. di Scienze della Terra e Geologico-Ambientali, Via Zamboni 67, 40126 Bologna, Italy. E-mail: mariacristina.perri@unibo.it UniversitaÁ degli Studi di Milano, Dip. Scienze della Terra, Via Mangiagalli 34, 20133 Milano, Italy. E-mail: alda.nicora@unimi.it MNHN, DeÂpartement Histoire de la Terre, GeÂologie, 43 Rue Buffon, 75005 Paris, France. E-mail: pdewever@mnhn.fr  * (  +$ )
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