Geobios Gaillot et al.
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NEW LATEST PERMIAN FORAMINIFERS FROM LAREN (GUANGXI 1PROVINCE
Introduction 83Traditionally, Late Permian (Lopingian) microfossils are considered as tenacious 84 survivors, between two severe biotic crises: end-Middle Permian and, then, the worst, end-85Permian crisis, where the life has almost disappered from the earth. According to Loeblich 86 and Tappan (1987), only 15 fusuline genera in the super-families Schubertelloidea and 87Staffelloidea persisted within Lopingian times, between the two crises. Additional 23 to 25 88 non-fusuline genera (i.e., Biseriamminoidea, Endothyroidea, Tetrataxidoidea, 89 Palaeotextulariioidea, and Lasiodiscoidea) are known from Wuchiapingian to Changhsingian 90 rocks, respectively. In this time interval, at least 35 genera of lagenids are also recognised. 91Among them, e.g., Geinitzina, Pachyphloia, Nodosinelloides, Protonodosaria and Robuloides 92 are especially widespread. Dasycladals are very few, less than 10 genera (see compilation in 93 Granier and Grgasovic, 2000). Only bioaccumulations of Permocalculus or Gymnocodium 94 can be emphasized (e.g., Théry et al., 2007). 95Recently, the knowledge of the Late Permian foraminifers and calcareous algae was 96 improved by different works concerning the Khuff Formation (Late Middle Permian to Early 97 Triassic) in the Middle East (Vaslet et al., 2005;Vachard et al., 2005; Insalaco et al., 2006; 98 Gaillot, 2006;Vachard et al., 2006; Gaillot and Vachard, submitted). Many new taxa are 99 illustrated and/or described within these contributions. 100 Geobios Gaillot et al.
4The Permian-Triassic Khuff Formation, our initial reference, has been defined by Steineke 101 et al. (1958) (Vaslet et al. 2005;Vachard et al. 2005;Gaillot, 2006). 107The Khuff depositional system developed on the margin of the Neo-Tethyan Ocean, 108 separating the Gondwana supercontinent from the Gondwanan terranes (Cimmerian 109 megablock). The general palaeogeographic context of this system was a marginal marine 110 shelf setting with an inner platform that was very flat, ramp-like, but with local depressions 111 (Sharland et al. 2001; Insalaco et al. 2006). 112Comprehensive investigations recently undertaken in the Nanpanjiang Basin (South China) 113 revealed a rich and new Late Permian foraminiferal-algal association. The discovery, 114 description and revision of some new and/or stratigraphically and palaeogeographically 115 significant taxa are related, identifying the main markers for the latest Permian in South 116China. Among the foraminifers, the group of Biseriamminoidea was the most important and 117 highly diversified, because the disappearance of the neoschwagerinid, verbeekinid and 118 schwagerinid fusulines at the end-Capitanian, 119In South China as well as elsewhere in the Tethys, and especially in western Neo-Tethys, 120 the shallow depositional settings of the Lopingian (including Wuchiapingian and 121 Changhsingian) are generally characterized by abundant Globivalvulinidae (family including 122 Paradag...