Description of a new species of Sparassocynus (Marsupialia: Didelphoidea: Sparassocynidae) from the late Miocene of Jujuy (Argentina) and taxonomic review of Sparassocynus heterotopicus from the Pliocene of Bolivia
Description of a new species of Sparassocynus (Marsupialia: Didelphoidea: Sparassocynidae) from the late Miocene of Jujuy (Argentina) and taxonomic review of Sparassocynus heterotopicus from the Pliocene of Bolivia
复制标题
DOI：
10.11646/zootaxa.3937.1.7
复制
发表时间：
2015-03-24
期刊：
影响因子：
0.9
通讯作者：
Mamani Quispe, Bernardino
中科院分区：
文献类型：
--
作者：
Alejandra Abello, Maria;De Los Reyes, Martin;Mamani Quispe, Bernardino
本文记述了松鲷科有袋类一新种---美玛松鲷Sparassocynus maimarai n. sp.的一个新化石，该化石来自阿根廷胡胡伊省晚中新世迈马拉组，其左下颌骨碎片具有完整的p2-m4序列。它不同于S. bahiai（Montehermosan-late Miocene/early Pliocene-Buenos Aires Province，Argentina）和S. derivatus（布宜诺斯艾利斯省的Chapadmalalan和Marplatan-Pliocene），其较小的尺寸，相对于m4的m1相对较长，在m1-3上的para-and metaconid之间延伸的舌带的存在，以及其更强大的entoconids。作为这项研究的一部分，Sparassocynus heterotopicus（蒙特埃尔莫桑，乌马拉，玻利维亚;上新世）的分类地位进行了审查，得出的结论是，这个分类群应被称为'Sparassocynus' heterotopicus和被认为是一个Didelphoidea的不确定的亲和力。梅氏金雀花sp.是该属最古老的记录，为评估sparassocynids的起源和早期多样化提供了新的信息。梅氏金雀花sp.的恢复具有精确的地层控制，凸显了其对阿根廷西北部迈马拉组与其他中新世-上新世地层单位之间的时间相关性的潜在生物地层学意义。
A new species of sparassocynid marsupial, Sparassocynus maimarai n. sp. from the late Miocene of Maimara Formation (Jujuy Province, Argentina) is described from a left mandibular fragment with a complete p2-m4 series. It differs from the remaining species of the genus S. bahiai (Montehermosan-late Miocene/early Pliocene-of Buenos Aires Province, Argentina) and S. derivatus (Chapadmalalan and Marplatan-Pliocene of Buenos Aires Province) by its smaller size, the relatively longer m1 with respect to the m4, the presence of a lingual cingulum extended between para-and metaconid on the m1-3, and its more robust entoconids. As part of this study the taxonomic status of Sparassocynus heterotopicus (Montehermosan, Umala, Bolivia; Pliocene) was reviewed concluding that this taxon should be referred to as 'Sparassocynus' heterotopicus and considered a Didelphoidea of uncertain affinities. Sparassocynus maimarai n. sp. is the oldest records of the genus, adding new information to evaluate the origins and early diversification of sparassocynids. Sparassocynus maimarai n. sp. was recovered with precise stratigraphic control, highlighting its potential biostratigraphic significance to the temporal correlations between Maimara Formation and other Mio-Pliocene stratigraphic units from the northwestern Argentina.