Abstract We agree with Mayr et al., 2020, that a pelvis from the Maastrichtian of Romania closely resembles Garantuavis philoinos, from the Late Cretaceous of the Ibero-Armorican island, showing that gargantuaviids were not restricted to the latter landmass. However, we disagree with many other assertions and interpretations of Mayr et al.: contrary to their claims, lines of arrested growth are known in the bones of many modern birds; not all terrestrial birds have a narrow pelvis; the pubic and ischiadic peduncles are broken on all Gargantuavis pelves from the Ibero-Armorican island; an enlargement of the middle part of the synsacrum (to accommodate the glycogen body) is not present in all Ornithothoraces, since it is absent in Hesperornithiformes (probably because of the low number of preacetabular synsacral vertebrae, as in Gargantuavis); the palaeobiogeographical scenario proposed by Mayr et al. is not supported by palaeogeographical reconstructions of Cretaceous Europe. We conclude that Gargantuavis was a basal ornithurine, at an evolutionay level similar to that of Hesperornithiformes, in all likelihood the result of insular evolution (involving the crossing of sea barriers) on the Late Cretaceous European archipelago.

中文翻译：

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Gargantuavis 是一种岛状的基础鸟鸟氨酸：对 Mayr 等人的评论，2020 年，“罗马尼亚马斯特里赫特人保存完好的骨盆表明神秘的 Gargantuavis 既不是鸟鸟氨酸，也不是岛国特有的鸟类”

摘要 我们同意 Mayr 等人在 2020 年的观点，即来自罗马尼亚马斯特里赫特的骨盆与来自伊比利亚-阿莫里克岛晚白垩世的 Garantuavis philoinos 非常相似，这表明 gargantuaviids 并不仅限于后者的陆地。然而，我们不同意 Mayr 等人的许多其他断言和解释：与他们的主张相反，许多现代鸟类的骨骼中都知道生长停滞线；并非所有陆生鸟类的骨盆都狭窄；来自 Ibero-Armorican 岛的所有 Gargantuavis 骨盆的耻骨和坐骨柄都被破坏了；合成骶骨中部的扩大（以容纳糖原体）并非在所有鸟胸目中都存在，因为它在 Hesperornithiformes 中不存在（可能是因为髋臼前的同骶椎骨数量很少，如在 Gargantuavis 中）；Mayr 等人提出的古生物地理情景。白垩纪欧洲的古地理重建不支持。我们得出结论，Gargantuavis 是一种基础鸟鸟氨酸，其进化水平与 Hesperornithiformes 相似，很可能是晚白垩世欧洲群岛岛屿进化（包括跨越海障）的结果。