Abstract Undichna quadrisulcata isp. nov. is described from the Eocene of Spitsbergen, where it occurs together with xiphosuran (horseshoe crabs) traces in upper shoreface to foreshore deltaic sandstone. This is the first record of a marine (deltaic) Undichna from the Eocene. The trail consists of two or three pairs of paralleling sinusoidal grooves (in epirelief) or ridges (in hyporelief). Previous records of this trace fossil from the Carboniferous and Permian were assigned to U. insolentia Anderson, 1976, which, however, comprises a more complex pattern. The repeated occurrence of U. quadrisulcata isp. nov. in the Carboniferous, Permian, Triassic and Eocene, independent from U. insolentia, justifies its own ichnospecies name and suggests a different kind of producer. U. quadrisulcata isp. nov. is interpreted as a fish trail, probably produced by a representative of Amiiformes (actinopterygian, ray-finned fish) or coelacanth fish.

中文翻译：

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Fish Trail Undichna quadrisulcata isp。十一月 斯匹次卑尔根始新世

摘要 Undichna quadrisulcata isp。十一月 描述自斯匹次卑尔根岛始新世，在那里它与 xiphosuran（马蹄蟹）痕迹一起出现在上岸面到前岸三角洲砂岩中。这是始新世海洋（三角洲）Undichna 的第一个记录。小径由两对或三对平行的正弦凹槽（在浮雕中）或脊（在低浮雕中）组成。这种来自石炭纪和二叠纪的痕迹化石的先前记录被分配给 U. insolentia Anderson, 1976，然而，它包含一个更复杂的模式。U. quadrisulcata isp 的重复发生。十一月 在石炭纪、二叠纪、三叠纪和始新世，独立于 U. insolentia，证明了它自己的 ichnospecies 名称并暗示了一种不同的生产者。U. quadrisulcata isp。十一月 被解释为一条鱼的踪迹，