来自英国赫里福德郡（志留纪）化石库的一种新甲壳动物及其在软甲亚纲演化中的意义。
A new crustacean from the Herefordshire (Silurian) Lagerstätte, UK, and its significance in malacostracan evolution.
作者信息
Siveter David J, Briggs Derek E G, Siveter Derek J, Sutton Mark D, Legg David
机构信息
Department of Geology, University of Leicester, Leicester LE1 7RH, UK
Department of Geology and Geophysics, and Yale Peabody Museum of Natural History, Yale University, PO Box 208109, New Haven, CT 06520-8109, USA.
出版信息
Proc Biol Sci. 2017 Mar 29;284(1851). doi: 10.1098/rspb.2017.0279.
gen. et sp. nov. is a three-dimensionally preserved fossil crustacean with soft parts from the Herefordshire (Silurian) Lagerstätte, UK. It is characterized by a head with a head shield and five limb pairs, and a thorax (pereon) with nine appendage-bearing segments followed by an apodous abdomen (pleon). All the appendages except the first are biramous and have a gnathobase. The post-mandibular appendages are similar one to another, and bear petal-shaped epipods that probably functioned as a part of the respiratory-circulatory system. Cladistic analysis resolves the new taxon as a stem-group leptostracan (Malacostraca). This well-preserved arthropod provides novel insights into the evolution of appendage morphology, tagmosis and the possible respiratory-circulatory physiology of a basal malacostracan.
新属新种是一种来自英国赫里福德郡（志留纪） Lagerstätte的三维保存的化石甲壳动物，其软体部分得以保存。它的特征是头部有头甲和五对附肢，胸部（躯干部）有九个带附肢的节段，后面跟着一个无附肢的腹部（尾节）。除第一对外，所有附肢都是双枝型的，并有一个颚基。下颌后的附肢彼此相似，并带有花瓣状的上肢，可能起到呼吸循环系统一部分的作用。分支系统分析将这个新分类单元解析为茎群叶虾类（软甲纲）。这种保存完好的节肢动物为基础软甲纲动物的附肢形态演化、体节划分以及可能的呼吸循环生理学提供了新的见解。
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