干旱区生态环境知识资源中心(Arid): Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid

Arid

DOI	10.4202/app.00637.2019
	Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid
	Wilmsen, Markus; Nagm, Emad
通讯作者	Wilmsen, M (corresponding author), Senckenbetg Nat Hist Sammlungen Dresden, Museum Mineral & Geol, Sekt Palaozool, Konigsbrucker Landstr 159, D-01109 Dresden, Germany.
来源期刊	ACTA PALAEONTOLOGICA POLONICA
ISSN	0567-7920
EISSN	1732-2421
出版年	2019
卷号	64 期号:4 页码:831-849
英文摘要	Cretaceous nautiloids are commonly characterized by inflated shells and prolonged stratigraphic ranges. In the Albian, the species of Angulithes appeared and compressed, short-lived forms with narrow venters emerged during the Cenomanian age. Based on a new description, the late Cenomanian nautiloid Angulithes mermeti is discussed with its palaeobiological background and placed in an evolutionary context of the Cenomanian lineage of Angulithes, considering contemporaneous palaeoenvironmental changes and inferred functional traits. A. mermeti is characterized by a nearly oxycone shell with sharp venter and narrow umbilicus, a fairly sinuous suture, low inter-septal distances, and an almost dorsal siphuncle. Its palaeobiogeographical occurrence was latitudinally restricted to shallow tropical-subtropical shelf seas with a preferred habitat depth between 5-50 m. Several morphological trends reflected by the Cenomanian species of the genus culminated in the late Cenomanian species A. mermeti, i.e., (i) increasing shell compression and sharpening of the venter, (ii) increasing folding of the septa, (iii) reduction of inter-septal distances, and (iv) dorsally directed migration of the siphuncle. The hydrodynamically efficient form was favorable to successfully populate the wide and shallow epicontinental seas that formed during the Cenomanian age. The increasing sutural sinuosity and the dense septal spacing aimed to buttress the shells against shell-breaking predators while the functional reason for the dorsal-directed migration of siphuncle is more elusive; it may have improved the efficiency of the hydrostatic apparatus and its internal position is beneficial in the case of predation, too. The gradual morphological change in the Cenomanian lineage of the genus Angulithes provides a well-constrained case study of rapid evolutionary response to major environmental pressure, i.e., the opening of newly available niches in the course of the great early Late Cretaceous transgression, in an otherwise rather bradytelic biotic group.
英文关键词	Cephalopoda Nautilida palaeobiogeography autecology functional morphology evolutionary patterns Cenomanian Egypt
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000503253700015
WOS关键词	EASTERN DESERT ; SEQUENCE STRATIGRAPHY ; WADI QENA ; AMMONITES ; SEPTA ; LIFE ; BIOSTRATIGRAPHY ; PALEOECOLOGY ; CEPHALOPODA ; MICROFACIES
WOS类目	Paleontology
WOS研究方向	Paleontology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/369617
作者单位	[Wilmsen, Markus] Senckenbetg Nat Hist Sammlungen Dresden, Museum Mineral & Geol, Sekt Palaozool, Konigsbrucker Landstr 159, D-01109 Dresden, Germany; [Nagm, Emad] Taibah Univ, Coll Sci, Dept Geol, Madinah 41411, Saudi Arabia; [Nagm, Emad] Al Azhar Univ, Fac Sci, Dept Geol, Assiut 71524, Egypt
推荐引用方式 GB/T 7714	Wilmsen, Markus,Nagm, Emad. Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid[J],2019,64(4):831-849.
APA	Wilmsen, Markus,&Nagm, Emad.(2019).Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid.ACTA PALAEONTOLOGICA POLONICA,64(4),831-849.
MLA	Wilmsen, Markus,et al."Palaeobiology and evolutionary context of Angulithes mermeti, a streamlined early Late Cretaceous shallow-water nautiloid".ACTA PALAEONTOLOGICA POLONICA 64.4(2019):831-849.