경상남도 하동군 하부 백악기 하산동층에서 산출된 익룡 지골 화석 = A pterosaur wing phalanx from the Lower Cretaceous Hasandong Formation of Hadong-gun, Gyeongsangnam-do, South Korea

다국어 초록 (Multilingual Abstract)

A partial second wing phalanx of a pterosaur was discovered from the coastal outcrop of Dae Island (Hasandong Formation, Aptian), Geumnam-myeon, Hadong-gun, Gyeongsangnam-do, South Korea. It is assigned to cf. Boreopteridae based on the comparisons to other Early Cretaceous Asian pterosaurs in shape and size. The estimated manus and pes size of this specimen is heteropodous and much larger than those of the pterosaur ichnotaxon Pteraichnus koreanensis, which was known from the same formation, suggesting there were at least two groups of pterosaurs co-existed during the Hasandong time. Since boreopterids have only been reported from the Lower Cretaceous Yixian Formation (Aptian) of China, this new specimen not only represents the first record of boreopterids outside of the Yixian Formation but their distribution was also greatly extended to the southeast. Moreover, the occurrence in the fluvial deposits suggests that boreopterids also lived in the riparian environment as well as lacustrine one.

국문 초록 (Abstract)

경상남도 하동군 금남면 대도의 해안선에 노출된 중부 하산동층(Aptian)에서 익룡의 네 번째 앞발가락 뼈일부가 발견됐다. 전기 백악기에 생존했던 아시아 익룡들과의 크기 및 형태 비교를 통해 이 화석을 cf.
Boreopteridae로 분류했다. 추정된 발 크기는 같은 층에서 보고된 생흔종 Pteraichnus koreanensis의 것보다 훨씬 크며, 앞뒤 발자국 크기가 서로 비슷한 P. koreanensis와 달리 Boreopteridae의 앞뒤 발자국 크기는 서로 다르기 때문에 하산동층 시기에 최소한 두 종류의 익룡이 공존했음을 보여준다. 이전에 보고된 Boreopteridae는모두 중국의 하부 백악기 이시안층(Aptian)에서 산출되었기 때문에 이 화석은 중국 밖에서 처음 보고되는Boreopteridae에 대한 기록임과 동시에 이들의 분포가 남동쪽으로 크게 연장돼있었음을 보여준다. 또한 이 화석은 하성 퇴적층에서 발견됐기 때문에 Boreopteridae가 강 주변에서도 생활했음을 보여준다.

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