F. Braig, J. Haug, undefined Shane T. AHYONG, A. Garassino, M. Schädel, C. Haug
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引用次数: 0
Abstract
Mantis shrimps (Stomatopoda Latreille, 1817) are marine predatory crustaceans of the group Hoplocarida Calman, 1904 with an interesting, though incompletely known, evolutionary history. Here we introduce a new species of fossil mantis shrimps, Ostenosculda teruzzii n. gen., n. sp. from the Early Jurassic (Sinemurian) limestone formation of Osteno (Northern Italy). We present distinctive features that characterize the specimens as a new species, such as a unique arrangement of maxillipeds 2-5 (maxilliped 2 is the major raptorial appendage). We also present a phylogenetic systematic interpretation of the species based on the available features of morphology and body organisation. The unusual arrangement of the maxillipeds appears to represent a plesiomorphic condition relative to extant mantis shrimps: the maxillipeds are arranged in an almost straight anterior-posterior line, with rather large distances between them. This contrasts with extant forms and slightly younger fossils of about 150 million years old lithographic limestones (Late Jurassic) where further anterior maxillipeds are inserting far laterally and further posterior ones more medially, with very small distances between the next posterior ones. The herein studied specimens are the first of their kind to be confirmed for this period and geographical region and further close gaps in our understanding of the evolution of mantis shrimps.
螳螂虾(Stomatopoda Latreille, 1817)是一种海洋掠食性甲壳类动物,属于Hoplocarida Calman, 1904年,具有有趣的,尽管不完全了解的进化史。本文介绍了意大利北部奥斯蒂诺早侏罗世(Sinemurian)石灰岩地层中发现的螳螂虾化石的一个新种——osteosculda teruzzii n. gen., n. sp.。我们提出了该标本作为新种的独特特征,如2-5肢的独特排列(2肢是猛禽的主要附属物)。我们还提出了基于形态学和身体组织的可用特征的物种的系统发育系统解释。相对于现存的螳螂虾,这种不寻常的颌足类排列似乎代表了一种非对称状态:颌足类排列在一条几乎笔直的前后直线上,它们之间的距离相当大。这与现存的形式和稍年轻的化石形成鲜明对比,这些化石大约有1.5亿年的历史(晚侏罗世),在这些化石中,更前的颌足动物是向远处插入的,而更后的颌足动物是向中间插入的,后面的颌足动物之间的距离非常小。本文研究的标本是这一时期和地理区域首次确认的同类标本,进一步填补了我们对螳螂虾进化的认识空白。
期刊介绍:
Comptes Rendus Palevol is a fully electronic and peer-reviewed journal, with a continuous publication stream, devoted to palaeontology, prehistory and evolutionary sciences. It publishes original research results, in French or English, in the following domains: systematic and human palaeontology, prehistory, evolutionary biology and macroevolution, and history of sciences. Thematic issues may also be published under the responsibility of a guest editor. All articles published in Comptes Rendus Palevol are compliant with the different nomenclatural codes. A copyright assignment will be signed by the authors before publication.