Abstract An assemblage of large and robust pedunculate scalpellomorph cirripede barnacles from the Maastrichtian of Kalaat Senan (Tunisia) is described, and their stratigraphical position within the Abiod and El Haria formations is noted. Four taxa are documented, three of which are confined to the Kalaat Senan area, namely Pachyscalpellum heltzeli, Cretiscalpellum robaszynskii sp. nov. and Diotascalpellum sp.; the fourth, Diotascalpellum curvatum, was previously recorded only from the Maastrichtian of the Farafra Oasis in the Western Desert of Egypt, 2000 km to the southeast. The record of Pollicipes glaber from this locality may well be conspecific with C. robaszynskii sp. nov. The new finds yield clues to the evolution of the composition of the North African cirripede assemblages during the early and late Maastrichtian, up close to the Cretaceous–Paleogene (K/Pg) boundary mass extinction. The fauna is of remarkably large size and strongly armoured for the supposedly offshore open-marine palaeoenvironment of Kalaat Senan, a faunal character that seems to have developed after the Campanian and disappeared by the Danian. The presence of Pachyscalpellum, a genus that was previously restricted to Australasia, indicates faunal connections with the eastern Tethys. Their documented first arrival coincides roughly with the first documented occurrence of northern American scaphitid ammonite genus Discoscaphites. The original description of P. heltzeli is extended; it is characterised particularly by a very elongated scutum. Similar scuta are shown to have evolved independently in the scalpellid genus Regioscalpellum of the European Upper Cretaceous. The family assignment of Pachyscalpellum as a scalpellid is questioned. urn:lsid:zoobank.org :pub:BE62D227-BCCE-46E2-A8B5-69EB05A95533.

中文翻译：

---

来自突尼斯 Kalaat Senan 的 Maastrichtian 的 Cirripedes (Thoracica, Crustacea)

摘要 描述了来自 Kalaat Senan（突尼斯）的 Maastrichtian 的一组大而健壮的有蒂解剖刀形藤壶，并记录了它们在 Abiod 和 El Haria 地层中的地层位置。记录了四种分类群，其中三种仅限于 Kalaat Senan 地区，即 Pachyscalpellum heltzeli、Cretiscalpellum robaszynskii sp。十一月 和 Diotascalpellum sp.；第四个，Diotascalpellum curvatum，以前仅在埃及西部沙漠法拉夫拉绿洲的马斯特里赫特岛记录到，距东南部 2000 公里。来自该地区的 Pollicipes glaber 的记录很可能与 C. robaszynskii sp 相同。十一月 这些新发现为马斯特里赫特早期和晚期北非卷足类群的组成演化提供了线索，接近白垩纪-古近纪（K/Pg）边界大灭绝。对于 Kalaat Senan 据称是近海开放海洋古环境而言，该动物群的体型非常大，并且有着坚固的装甲，这种动物群特征似乎是在坎帕期之后发展起来的，但在大年期之后消失了。Pachyscalpellum 的存在表明该属与东特提斯群岛有动物群系联系，该属以前仅限于澳大利亚。他们记录的第一次到达大致与美国北部的菊石属菊石属的首次记录发生一致。对 P. heltzeli 的原始描述进行了扩展；它的特点是非常细长的盾牌。在欧洲上白垩纪的手术刀属 Regioscalpellum 中显示出类似的鳞片已经独立进化。Pachyscalpellum 作为手术刀的家族分配受到质疑。urn:lsid:zoobank.org :pub:BE62D227-BCCE-46E2-A8B5-69EB05A95533。