New material of the cirripede genus Concinnalepas is described from the Kimmeridge Clay (Tithonian) of Dorset (UK) and the Marnes de Port (Bathonian) of Port-en-Bessin in Normandy (France). Articulated specimens of C. costata (Withers, 1928), attached to driftwood from Kimmeridge, provide hitherto unknown details of tiered lateral plate formation in the species, and Concinnalepas bessinensis sp. nov. and C. rugosa sp. nov. are described from Normandy and Dorset, respectively. Concinnalepas bessinensis sp. nov. is the oldest calcite-shelled cirripede known to date. A review of the distribution of Jurassic calcareous cirripedes demonstrates that pre-Kimmeridgian records are very sparse and scattered and the early evolutionary history of the group is poorly known. The late Kimmeridgian and Tithonian saw a radiation of the Family Zeugmatolepadidae and a great increase in abundance of cirripedes that mostly lived as epiplankton, attached to driftwood and ammonite shells.

来自多塞特（英国）的 Kimmeridge Clay（Tithonian）和诺曼底（法国）的 Port-en-Bessin 的 Marnes de Port（Bathonian）描述了卷足属Concinnalepas 的新材料。C. costata (Withers, 1928) 的铰接标本，附着在来自 Kimmeridge 的浮木上，提供了迄今为止未知的物种分层侧板形成的细节，以及Concinnalepas bessinensis sp。十一月 和C. rugosa sp。十一月 分别来自诺曼底和多塞特。白羊座sp. 十一月 是迄今为止已知的最古老的方解石壳卷足。对侏罗纪钙质卷足类分布的回顾表明，前金立纪时期的记录非常稀疏和分散，而且该群体的早期进化历史鲜为人知。晚金里吉阶和提通阶看到了 Zeugmatolepadidae 家族的辐射和大量增加的卷足类，它们主要作为浮游生物生活，附着在浮木和菊石壳上。