意大利托斯卡纳地区下上新世海洋脊椎动物区嗜热casatia(鲸目,单齿动物科)的新遗迹

IF 1.6 3区 地球科学 Q2 GEOLOGY Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2022-02-16 DOI:10.54103/2039-4942/15459
Marco Merella, A. Collareta, Valerio Granata, S. Casati, G. Bianucci
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引用次数: 3

摘要

单齿鲸目动物的一个不完整的颅骨、三个颈骨(包括中轴)和两个可能的腰骨在这里被描述为上新世晚期(约5.1–4.5 Ma)在Arcille(意大利托斯卡纳格罗塞托省)出现的海相砂岩。这一化石发现与嗜热Casatia的正模标本来自同一位置,在整体大小和颅骨形态方面与之相似,尤其是在上颌前囊窝前方和前内侧沟内侧,显示出类似的上颌前背表面凹陷部分。因此,我们的新发现被归属于嗜热梭菌,并描述了正模中缺失的重要解剖部分,以改进对这种单齿物种的诊断。上颌骨的一些有牙齿的碎片暗示着同齿和多齿的牙齿,这反过来又表明了一种捕捉公羊猎物的方法,这种方法不同于现存单齿动物特有的高度衍生的抽吸方法。第二次在温暖的Arcille古环境中发现嗜热梭菌,进一步支持了单齿类曾经在热带和亚热带栖息地繁衍生息的假设。
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NEW REMAINS OF CASATIA THERMOPHILA (CETACEA, MONODONTIDAE) FROM THE LOWER PLIOCENE MARINE VERTEBRATE-BEARING LOCALITY OF ARCILLE (TUSCANY, ITALY)
An incomplete cranium, three cervicals (including the axis) and two likely lumbars of a monodontid cetacean are here described from lower Pliocene (ca. 5.1–4.5 Ma) marine sandstones cropping out at Arcille (Grosseto Province, Tuscany, Italy). This fossil find comes from the same locality as the holotype of Casatia thermophila, which it resembles in terms of overall size and cranial morphology, and especially, by displaying a similarly depressed portion of the dorsal surface of the premaxillae anterior to the premaxillary sac fossae and medial to the anteromedial sulci. Our new find is thus assigned to C. thermophila, and significant anatomical parts that are missing in the holotype are described in order to improve the diagnosis of this monodontid species. Some dentigerous fragments of the maxillae hint at a homodont and polydont dentition, which in turn suggests a ram prey capture method that differs from the highly derived suction method that is proper of extant monodontids. This second find of C. thermophila from the warm-water Arcille palaeoenvironment lends further support to the hypothesis that monodontids once thrived in tropical and subtropical habitats.
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来源期刊
CiteScore
3.60
自引率
4.30%
发文量
28
审稿时长
>12 weeks
期刊介绍: The Rivista Italiana di Paleontologia e Stratigrafia was founded in 1895. It publishes original papers dealing with all fields of paleontology and of stratigraphy, from Italy and the Mediterranean to the Tethys, as well across the globe from China to North America.
期刊最新文献
NEW ACROPOMATIFORM FOSSILS FROM THE UPPER KUEICHULIN FORMATION (LOWER PLIOCENE), NORTHERN TAIWAN REVISITING THE CRETACEOUS LUNGFISH ATLANTOCERATODUS IHERINGI (AMEGHINO 1898) FROM THE MATA AMARILLA FORMATION (ARGENTINA) WITH COMMENTS ON TOOTH PLATES HISTOLOGY FIRST REPORT ON THE UPPERMOST PERMIAN OSTRACODS FROM THE MASORE SECTION (EXTERNAL DINARIDES), SLOVENIA EOCENE STALKED CRINOIDS IN THE GENUS ISSELICRINUS (ECHINODERMATA, CRINOIDEA, ISOCRINIDA) FROM NORTHEASTERN ITALY NEW REPORT OF DECAPOD AND ISOPOD CRUSTACEANS FROM THE LOWERMIDDLE PLEISTOCENE OF MONTALBANO JONICO, MATERA (BASILICATA, SOUTHERN ITALY)
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