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甘肃省早白垩世地层中,出土了大量恐龙骨骼以及恐龙足迹化石,但是至今未有蛋化石的报道。根据发现于兰州-民和盆地下白垩统河口组的蛋壳化石,建立一恐龙蛋新蛋属、蛋种,并将其归于一新蛋科:Polyclonoolithidae(多小枝蛋科)。新发现的蛋化石标本不同于所有已知的恐龙蛋类型,具有独特的显微特征组合:分叉的蛋壳单元向外延伸至蛋壳外表面,并未在靠近蛋壳外表面处融合成层;弦切面上具相互链接或独立的多角形的蛋壳单元;以及不规则的气孔道。中国的恐龙蛋化石大多出自晚白垩世地层,仅在辽宁有早白垩世恐龙蛋的报道。新发现扩展了中国恐龙蛋化石的地质和地理分布,也有可能为圆形蛋科蛋壳结构的起源提供新的认识。
In the Early Cretaceous strata of Gansu Province, a large number of dinosaur bones and dinosaur footprints were unearthed, but no egg fossils have been reported so far. Based on the eggshell fossils found in the Lower Cretaceous estuary of the Lanzhou-Minhe basin, a dinosaur egg, egg species was established and assigned to a new egg family, Polyclonoolithidae. The newly discovered egg fossil specimen differs from all known dinosaur egg types with a unique combination of microscopic features: the bifurcated eggshell unit extends outward beyond the outer surface of the egg shell and does not fuse near the outer surface of the egg shell Layer; chord section with interlinked or independent polygonal egg shell unit; and irregular stomatal tract. Most dinosaur egg fossils in China originate from the Late Cretaceous strata, with the reports of the Early Cretaceous dinosaur eggs in Liaoning. The new discovery expands the geological and geographical distribution of Chinese dinosaur egg fossils and may also provide new insights into the origins of the egg shell structure of the round egg.