Abstract We present the first record of an extinct procyonid for Bolivia (Tariquia Formation, La Angostura, Santa Cruz de La Sierra; Late Miocene). It corresponds to Cyonasua, the first Carnivore taxon to enter South America from North America before the Paniamian Isthmus raised and as a part of the “proto Great American Biotic Interchange” (GABI). Cyonasua fossil record, comprises the temporal lapse late Miocene to early Pleistocene in several localities of Argentina, Venezuela and Uruguay. This genus encompasses ten formally named species: C. argentina, C. brevirostris, C. longirostris, C. pascuali, C. groeberi, C. lutaria, C. clausa, C. robusta, C. argentines, and C. meranii. The mandible and teeth preserved of the new specimen, YPFBLIT-PAL-020, allows us to assign it to Cyonasua cf. C. pascuali. This record reinforces the paleoenvironment with warm climates and humid environments with abundant water bodies, vegetation and trees proposed previously for Tariquia Fm. Also, the proposed Huayquerian Age for this Formation is supported by this record.

中文翻译：

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中新世晚期玻利维亚 Tariquía Fm. 化石 procyonid (Cyonasua cf. C. pascuali), Mammalia, Procyonidae) 的首次记录

摘要 我们展示了玻利维亚（Tariquia Formation, La Angostura, Santa Cruz de La Sierra；晚中新世）关于已灭绝的南河豚的第一个记录。它对应于 Cyonasua，在帕尼亚地峡出现之前，第一个从北美进入南美洲的食肉动物分类单元，并作为“原始大美洲生物交换”（GABI）的一部分。Cyonasua 化石记录，包括阿根廷、委内瑞拉和乌拉圭几个地方的中新世晚期至更新世早期的时间推移。该属包括十个正式命名的物种：C. argentina、C. brevirostris、C. longirostris、C. pascuali、C. groeberi、C. lutaria、C. clausa、C.robusta、C. argentines 和 C. meranii。新标本 YPFBLIT-PAL-020 保留的下颌骨和牙齿使我们能够将其分配给 Cyonasua cf。C. pascuali。该记录强化了先前为 Tariquia Fm 提出的具有温暖气候和潮湿环境以及丰富的水体、植被和树木的古环境。此外，该地层提议的怀奎里时代也得到了该记录的支持。