スピノサウルス

📖 1. 概要

体長最大15mに達し、知られるすべての肉食恐竜の中で最も長かった半水生の獣脚類で、背中には高さ1.65mの帆（セール）がそびえていました。

🌐 Wikipedia 要約抜粋

Spinosaurus is a genus of large spinosaurid theropod dinosaurs that lived in what is now North Africa during the Cenomanian age of the Late Cretaceous period, about 100 to 94 million years ago. The genus was known first from Egyptian remains discovered in 1912 and described by German palaeontologist Ernst Stromer in 1915. The original remains were destroyed in World War II, but additional material came to light in the early 21st century. It is unclear whether one or two species are represented in the fossils reported in the scientific literature. The type species, S. aegyptiacus, is mainly known from the Bahariya Formation in Egypt and the Kem Kem beds in Morocco. The other species, S. mirabilis, is known from the Farak Formation in Niger. Possible junior synonyms include Sigilmassasaurus and the dubious S. maroccanus from the Kem Kem beds and Oxalaia from the Alcântara Formation in Brazil, though the distinction and validity of these taxa have been debated.

🦴 2. 体の構造と特徴

ワニのように長い吻端の水圧感知神経孔と、サンショウウオのように上下に幅広いヒレ状の推進尾を使って巨大魚類を狩っていました。

🔍 3. 化石記録と古生態

2020年にモロッコで発掘された完全な尾の骨格化石によって、水中遊泳への適応が実証されました。

🇰🇷 4. 韓国との関わり

慶尚南道河東郡の前期白亜紀地層から、スピノサウルス類系統の円錐形の歯の化石が発見されました。