Abstract Pycnodont fishes (Actinopterygii, Pycnodontiformes) contributed a major role to many ichthyological assemblages in the Mesozoic, however their occurrence in the continental mid-Cretaceous Kem Kem Group of Morocco was only briefly noted by Sereno et al., 1996, but were not described. Here we describe the first diverse pycnodont assemblage in the Kem Kem beds of the Tafilalt region, based mainly on recent collecting. Pycnodont remains are represented by rare, mostly incomplete fragments of vomerine and prearticular dentitions, but despite their rarity, they are surprisingly diverse with four morphotypes represented, including two new taxa: Neoproscinetes africanus sp. nov. and Agassizilia gen. nov. From a sample of eight specimens, four species are recorded, three of which are new. The palaeoecology, taphonomy and biostratinomy of the specimens is discussed in the context of their occurrence in a predominantly freshwater sequence. Comparisons are made with the pycnodont assemblage of the approximately coeval Santana Group (Brazil) which contains taxa with similarities to the new Moroccan pycnodonts. These new pycnodont taxa increase the already diverse assemblage of the Kem Kem Group ichthyofauna.

中文翻译：

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来自摩洛哥东南部白垩纪中期、大陆 Kem Kem 床的不同种类的 pycnodont 鱼（Actinopterygii、Pycnodontomorpha）

摘要 Pycnodont 鱼类（Actinopterygii，Pycnodontiformes）在中生代的许多鱼类组合中起主要作用，但它们出现在摩洛哥的中白垩纪大陆 Kem Kem 群中，Sereno 等人仅在 1996 年简要地注意到它们，但并未对其进行描述. 在这里，我们描述了 Tafilalt 地区的 Kem Kem 床中第一个不同的 pycnodont 组合，主要基于最近的收集。Pycnodont 的残骸由稀有的、大部分不完整的犁骨和关节前牙列的碎片代表，但尽管它们很罕见，但它们的多样性令人惊讶，有四种形态类型，包括两个新的分类群：Neoproscinetes Africanus sp。十一月 和 Agassizilia gen。十一月 从八个标本的样本中，记录了四个物种，其中三个是新物种。古生态学，标本的埋藏学和生物地层学在它们以淡水为主的序列中出现的背景下进行了讨论。与大约同时代的桑塔纳组（巴西）的 pycnodont 组合进行了比较，其中包含与新的摩洛哥 pycnodonts 相似的分类群。这些新的 pycnodont 分类群增加了 Kem Kem 鱼群已经多样化的组合。