Dipnoan remains are mainly known from the Middle and Upper Devonian deposits in the Holy Cross Mountains, Poland. The presence of this group in the Lower Devonian was suggested by feeding trace fossils apparently made by dipnoan fish. Recent studies confirm the occurrence of body fossils based on single skeleton elements. Fragments of heavily ossified mandible and skull-roof represent dipnoan remains appear to belong to a primitive ‘Dipnorhynchus’-like form. It supplements the knowledge on the Early Devonian ecosystem at the Holy Cross Mountains and dipnoan ichnological record is now supported by fossil remains of a putative trace-maker for Osculichnus isp.

Dipnoan 遗迹主要来自波兰圣十字山脉的中泥盆纪和上泥盆纪沉积物。这个群体在下泥盆纪的存在是通过喂食显然是由双鱼制成的痕迹化石而提出的。最近的研究证实了基于单一骨架元素的身体化石的出现。严重骨化的下颌骨和头盖骨的碎片代表了双龙人的遗骸，似乎属于原始的“双龙人”状形式。它补充了有关圣十字山脉早泥盆世生态系统的知识，并且现在有Osculichnus isp的推定踪迹制造者的化石遗骸支持了双龙化石记录。