A new sinistrally coiled univalved molluskCatalanispiran. gen. is described with two species;Catalanispira reinwaldti(Öpik, 1930) from the Middle Ordovician Kõgekallas Formation (Darriwilian) of Estonia andCatalanispira plattevillensisn. gen. n. sp. from the Upper Ordovician Platteville Formation (Sandbian) of northern Illinois, USA. Morphological features include a large, low-trochiform shell, a narrow lenticular aperture, a deep funnel-like umbilicus, a falcate inner lip and a large (1.4 mm wide) protoconch. Ornamentation consists of fine commarginal growth lines or ribs but superimposed on a slightly irregular shell surface.Catalanispiran. gen. is placed within the sinistrally coiled order Mimospirida and the family Onychochilidae, and Catalanispirinae n. subfam. is proposed. The large Lower Ordovician (Tremadocian)PelecyogyraEbbestad and Lefebvre, 2015 from Morocco and France is transferred to this new subfamily. The well-preserved initial growth stage ofCatalanispira plattevillensisn. gen. n. sp. is cap-shaped, slightly asymmetrical, unusually large, and smooth, and represents either an unusually large embryonic shell (protoconch 1) or a larval shell (protoconch 2). It differs from the smaller protoconch described for the clisospirineMimospiraKoken in Koken and Perner, 1925, which might include a multiwhorled larval shell (protoconch 2). Mimospirids are dominantly Ordovician, and have been classified as untorted mollusks (only distantly related to gastropods), dextral hyperstrophic gastropods, or sinistral orthostrophic gastropods. Sinistral asymmetry already in the embryonic shell and lack of conclusive evidence for coiling direction, e.g., an operculum, could suggest thatCatalanispiran. gen. or similar mimosprids were sinistral orthostrophic gastropods. Currently the group is therefore classified as a group of sinistral orthostrophic gastropods, unranked within the Gastropoda.UUID:http://zoobank.org/affc8dcf-4c0f-493d-bee5-75a457996e84

中文翻译：

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来自波罗的海和劳伦西亚中上奥陶统的新甲壳类软体动物

一种新的左旋盘绕单瓣软体动物加泰罗尼亚螺旋体n. 将军 用两个物种来描述；加泰罗尼亚螺旋体(Öpik, 1930) 来自爱沙尼亚的中奥陶世 Kõgekallas 组 (Darriwilian)加泰罗尼亚螺旋体n. 将军 n. sp。来自美国伊利诺伊州北部的上奥陶统 Platteville 组（Sandbian）。形态特征包括一个大的、低旋形的壳、一个狭窄的透镜状孔、一个深漏斗状的脐、一个镰刀状的内唇和一个大的（1.4 毫米宽）原螺。装饰由细小的边缘生长线或肋条组成，但叠加在略微不规则的壳表面上。加泰罗尼亚螺旋体n. 将军 被放置在向左盘绕的顺序 Mimospirida 和家庭 Onychochilidae 和 Catalanispirinae n。子家族。被提议。大下奥陶纪（特雷马多纪）蟋蟀来自摩洛哥和法国的 2015 年 Ebbestad 和 Lefebvre 被转移到这个新的亚科。保存完好的初始生长阶段加泰罗尼亚螺旋体n. 将军 n. sp。呈帽状，略微不对称，异常大且光滑，代表异常大的胚壳（原海螺 1）或幼虫壳（原海螺 2）。它不同于为 clisospirine 描述的较小的原螺含羞草属Koken 于 Koken 和 Perner，1925 年，其中可能包括一个多轮的幼虫壳（原海螺 2）。Mimospirids 主要是奥陶纪，并被分类为未扭曲的软体动物（仅与腹足类动物有远亲关系）、右旋肥大腹足动物或左旋正畸腹足动物。胚胎壳中已经存在左旋不对称，并且缺乏关于卷曲方向的确凿证据，例如鳃盖，可能表明加泰罗尼亚螺旋体n. 将军 或类似的 mimosprids 是左旋腹足动物。因此，目前该组被归类为一组左旋腹足动物，在 Gastropoda.UUID 中未排名：http://zoobank.org/affc8dcf-4c0f-493d-bee5-75a457996e84