篠山侏角龙属
篠山侏角龍屬 化石时期：早白垩世，
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科学分类 
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| 界： | 动物界 Animalia |
| 门： | 脊索动物门 Chordata |
| 纲： | 蜥形纲 Sauropsida |
| 总目： | 恐龍總目 Dinosauria |
| 目： | †鸟臀目 Ornithischia |
| 演化支： | †頭飾龍類 Marginocephalia |
| 亚目： | †角龍亞目 Ceratopsia |
| 下目： | †新角龍下目 Neoceratopsia |
| 属： | †篠山侏角龍屬 Sasayamagnomus Tanaka et al., 2024 |
| 模式種 | |
| †三枝氏篠山侏角龙 Sasayamagnomus saegusai Tanaka et al., 2024
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篠山侏角龙（学名：Sasayamagnomus，意为“来自篠山的侏儒”）是新角龙类恐龙的一个属，来自日本兵库县早白垩世大山下组。属下包括单一物种三枝氏篠山侏角龙（S. saegusai）。[1]估计正模标本长达80厘米（2.6英尺），尽管该标本尚未生长完全。[2]
发现与命名
[编辑]篠山侏角龙发现于兵库县丹波篠山市的宫田微脊椎动物地（Miyada microvertebrate site），已知化石包括17块脑颅骨骼、右喙骨及一个左胫骨。材料中保存的2个右鼻骨表明其中至少含2具个体。[1]其正式描述之前曾在2023年的一篇会议摘要上公布。[3]
其于2024年被正式描述为新角龙类新属新种。属名取自发现化石的篠山盆地及拉丁语单词“侏儒”。种名致敬丹波地区恐龙发掘活动的领导者，也是兵库县脊椎动物古生物学研究的卓越贡献者——三枝春雄（Haruo Saegusa）博士。[1]
正模标本为MNHAH D1-060516。[1]
分类
[编辑]Tanaka等人将篠山侏角龙纳入系统发育分析，并发现其与鹰角龙及黎明角龙共处同一演化支。[1]
古生态学
[编辑]
篠山侏角龙发现于大山下组（篠山群），后者年代为早白垩世末的阿尔布阶中早期。[4]这些层位主要由砂岩、泥岩及砾岩构成。沉积环境代表具有半湿润至半干旱气候的河流系统。[5]恐龙牙齿在该层各地都很常见，包括属于其它兽脚类（驰龙科、镰刀龙下目及暴龙超科）及蜥脚类、甲龙类和禽龙类的牙齿。[6]已描述了几个蛋化石類群，包括姬蛋屬、纖長蛋屬、日本蛋屬及稜柱形蛋屬。[7]地层中还发现了怪蜥类的双刃齿蜥、巨龙形类蜥脚下目丹波巨龙及伤齿龙科兽脚类寐猎龙。[8][9][4]篠山群还有其它化石动物群，但原始描述中并未提及其发现于该地层，如真兽类的篠山兽、[10]石龙子亚目的厚颌蜥[11]及两种蛙类——兵库蛙与丹波蛙。[12]
参见
[编辑]- 角龙类研究历史
参考资料
[编辑]- ^ 1.0 1.1 1.2 1.3 1.4 Tanaka, Tomonori; Chiba, Kentaro; Ikeda, Tadahiro; Ryan, Michael J. A new neoceratopsian (Ornithischia, Ceratopsia) from the Lower Cretaceous Ohyamashimo Formation (Albian), southwestern Japan. Papers in Palaeontology. September 2024, 10 (5). doi:10.1002/spp2.1587.
- ^ 兵庫県で発見の角竜類の化石 新属新種と確認 | お知らせ・トピックス. 岡山理科大学. [2024-09-04] （日语）.
- ^ Tanaka, Tomonori; Chiba, Kentaro; Ikeda, Tadahiro; Kubota, Katsuhiro. Phylogenetic position of a ceratopsian dinosaur from the Lower Cretaceous Ohyamashimo Formation (Albian) of the Sasayama Group in Tambasasayama City, Hyogo, Japan (PDF). The Palaeontological Society of Japan. 2023.
- ^ 4.0 4.1 Kubota, K.; Kobayashi, Y.; Ikeda, T. Early Cretaceous troodontine troodontid (Dinosauria: Theropoda) from the Ohyamashimo Formation of Japan reveals the early evolution of Troodontinae. Scientific Reports. 2024, 14. 16392. PMC 11272788
. doi:10.1038/s41598-024-66815-2 .
- ^ Hayashi, Keiichi; Fujita, Saki; Koarai, Kazuto; Matsukawa, Masaki. Stratigraphy and paleoenvironment of the Cretaceous Sasayama Group in the Sasayama area, Hyogo Prefecture, western Japan. The Journal of the Geological Society of Japan. 2017-09-15, 123 (9): 747–764. ISSN 0016-7630. doi:10.5575/geosoc.2017.0016 （英语）.
- ^ Kubota, Katsuhiro. 日本産の中生代恐竜化石目録 2022年版 [A list of Mesozoic dinosaur fossils from Japan in 2022] (PDF). Bulletin of the Gunma Museum of Natural History: 157–170.
- ^ Tanaka, Kohei; Zelenitsky, Darla K.; Therrien, François; Ikeda, Tadahiro; Kubota, Katsuhiro; Saegusa, Haruo; Tanaka, Tomonori; Ikuno, Kenji. Exceptionally small theropod eggs from the Lower Cretaceous Ohyamashimo Formation of Tamba, Hyogo Prefecture, Japan. Cretaceous Research. 2020, 114: Article 104519. Bibcode:2020CrRes.11404519T. S2CID 219449961. doi:10.1016/j.cretres.2020.104519.
- ^ Ikeda, T.; Ota, H.; Tanaka, T.; Ikuno, K.; Kubota, K.; Tanaka, K.; Saegusa, H. A fossil Monstersauria (Squamata: Anguimorpha) from the Lower Cretaceous Ohyamashimo Formation of the Sasayama Group in Tamba City, Hyogo Prefecture, Japan. Cretaceous Research. 2021, 130: Article 105063. S2CID 239230916. doi:10.1016/j.cretres.2021.105063 .
- ^ Saegusa, H.; Ikeda, T. A new titanosauriform sauropod (Dinosauria: Saurischia) from the Lower Cretaceous of Hyogo, Japan. Zootaxa. 2014, 3848 (1): 1–66. PMID 25112425. doi:10.11646/zootaxa.3848.1.1 .
- ^ Kusuhashi, Nao; Tsutsumi, Yukiyasu; Saegusa, Haruo; Horie, Kenji; Ikeda, Tadahiro; Yokoyama, Kazumi; Shiraishi, Kazuyuki. A new Early Cretaceous eutherian mammal from the Sasayama Group, Hyogo, Japan. Proceedings of the Royal Society B: Biological Sciences. 2013-05-22, 280 (1759): 20130142. ISSN 0962-8452. PMC 3619506 . PMID 23536594. doi:10.1098/rspb.2013.0142 （英语）.
- ^ Ikeda, Tadahiro; Ota, Hidetoshi; Saegusa, Haruo. A new fossil lizard from the Lower Cretaceous Sasayama Group of Hyogo Prefecture, western Honshu, Japan. Journal of Vertebrate Paleontology. 2015-01-02, 35 (1): e885032. ISSN 0272-4634. doi:10.1080/02724634.2014.885032 （英语）.
- ^ Ikeda, Tadahiro; Ota, Hidetoshi; Matsui, Masafumi. New fossil anurans from the Lower Cretaceous Sasayama Group of Hyogo Prefecture, Western Honshu, Japan. Cretaceous Research. 2016-06-01, 61: 108–123. ISSN 0195-6671. doi:10.1016/j.cretres.2015.12.024.
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