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首页> 外文期刊>Cybium >Histological study of the median lingual dental plate of the Cretaceous fish ? Palaeonotopterus greenwoodi (Teleostei: Osteoglossomorpha) from the Kem-Kem beds, Morocco
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Histological study of the median lingual dental plate of the Cretaceous fish ? Palaeonotopterus greenwoodi (Teleostei: Osteoglossomorpha) from the Kem-Kem beds, Morocco

机译：白垩纪鱼类中位舌牙板的组织学研究？摩洛哥Kem-Kem病床上的Palaeonotopterus greenwoodi（Teleostei：Osteoglossomorpha）

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摘要

We describe the histology of the lingual dental plate of an extinct Notopteridae, ?Palaeonotopterus greenwoodi, from the Cenomanian Kem-Kem Beds in Morocco. The lingual dental plate is bulky. Its regular and more or less smooth crushing surface does not exhibit any teeth externally. The plate is composed of several superimposed layers of side-by-side teeth. The teeth are attached to each other by a small amount of cellular bony tissue that may contain some vascular canals. The teeth originate inside the plate in a large dental cavity where odontogenesis takes place. Then, new teeth move passively towards the crushing surface and thicken to reach a maximum of 1 mm in diameter and 2 mm in height. The teeth are likely worn down by crushing food. Thus, ? Palaeonotopterus greenwoodi had true "coalesced teeth" that constituted a lingual chewing apparatus displaying a process of tooth renewal similar to that described in extant fish with durophagous diet, i.e. scarids, tetraodontids and the carangid fish Trachinotus teraia. We thus assume that ? Palaeonotopterus greenwoodi was durophagous. The Kem-Kem levels that yielded the lingual dental plates also delivered abundant shells of molluscs and remains of crustaceans that might have constituted prey of this extinct fish.
机译：我们从摩洛哥的Cenomanian Kem-Kem病床描述了已灭绝的opter翅科的舌状牙板的组织学。舌牙板笨重。其规则的或几乎光滑的破碎表面在外部没有任何牙齿。该板由几叠并排的齿组成。牙齿通过少量的可能包含一些血管的细胞性骨组织相互连接。牙齿起源于发生牙本质发生的大牙齿板中。然后，新齿被动地朝向破碎表面移动并变厚，最大直径达到1毫米，高度达到2毫米。牙齿可能因碾碎食物而磨损。因此，？ Palaeonotopterus greenwoodi具有真正的“突齿”，构成了一种舌头咀嚼器，显示出牙齿更新的过程，与食龙虾饮食中的即硬齿质，四齿类和角质类鱼类Trachinotus teraia所描述的相似。因此，我们假设？绿脚古龙是食虫性的。产生舌牙板的Kem-Kem水平还释放出丰富的软体动物壳和甲壳类动物的残留物，这些贝壳可能构成了这种灭绝鱼类的猎物。

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